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2019-09-25checkpatch: allow consecutive close bracesJoe Perches1-1/+1
checkpatch allows consecutive open braces, so it should also allow consecutive close braces. Link: http://lkml.kernel.org/r/bfdb49ae2c3fa7b52fa168769e38b48f959880e2.camel@perches.com Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25checkpatch: prefer __section over __attribute__((section(...)))Joe Perches1-0/+12
Add another test for __attribute__((section("foo"))) uses that should be __section(foo) Link: http://lkml.kernel.org/r/2f374c3c27054b7f978115270d587c624d9962fc.camel@perches.com Suggested-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Joe Perches <joe@perches.com> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25checkpatch: exclude sizeof sub-expressions from MACRO_ARG_REUSEBrendan Jackman1-1/+1
The arguments of sizeof are not evaluated so arguments are safe to re-use in that context. Excluding sizeof subexpressions means macros like ARRAY_SIZE can pass checkpatch. Link: http://lkml.kernel.org/r/20190806070833.24423-1-brendan.jackman@bluwireless.co.uk Signed-off-by: Brendan Jackman <brendan.jackman@bluwireless.co.uk> Acked-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25checkpatch.pl: warn on invalid commit idMatteo Croce1-0/+11
It can happen that a commit message refers to an invalid commit id, because the referenced hash changed following a rebase, or simply by mistake. Add a check in checkpatch.pl which checks that an hash referenced by a Fixes tag, or just cited in the commit message, is a valid commit id. $ scripts/checkpatch.pl <<'EOF' Subject: [PATCH] test commit Sample test commit to test checkpatch.pl Commit 1da177e4c3f4 ("Linux-2.6.12-rc2") really exists, commit 0bba044c4ce7 ("tree") is valid but not a commit, while commit b4cc0b1c0cca ("unknown") is invalid. Fixes: f0cacc14cade ("unknown") Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") EOF WARNING: Unknown commit id '0bba044c4ce7', maybe rebased or not pulled? #8: commit 0bba044c4ce7 ("tree") is valid but not a commit, WARNING: Unknown commit id 'b4cc0b1c0cca', maybe rebased or not pulled? #9: while commit b4cc0b1c0cca ("unknown") is invalid. WARNING: Unknown commit id 'f0cacc14cade', maybe rebased or not pulled? #11: Fixes: f0cacc14cade ("unknown") total: 0 errors, 3 warnings, 4 lines checked Link: http://lkml.kernel.org/r/20190711001640.13398-1-mcroce@redhat.com Signed-off-by: Matteo Croce <mcroce@redhat.com> Cc: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25checkpatch: improve SPDX license checkingJoe Perches1-9/+9
Use perl's m@<match>@ match and not /<match>/ comparisons to avoid an error using c90's // comment style. Miscellanea: o Use normal tab indentation and alignment Link: http://lkml.kernel.org/r/5e4a8fa7901148fbcd77ab391e6dd0e6bf95777f.camel@perches.com Link: http://lkml.kernel.org/r/f08eb62458407a145cfedf959d1091af151cd665.1563575364.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25checkpatch: don't interpret stack dumps as commit IDsJoe Perches1-2/+4
Add more types of lines that appear to be stack dumps that also include hex lines that might otherwise be interpreted as commit IDs. Link: http://lkml.kernel.org/r/ff00208289224f0ca4eaf4ff7c9c6e087dad0a63.camel@perches.com Link: http://lkml.kernel.org/r/f7dc9727795db3802809a24162abe0b67e14123b.1563575364.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25lib/hexdump: make print_hex_dump_bytes() a nop on !DEBUG buildsStephen Boyd2-28/+15
I'm seeing a bunch of debug prints from a user of print_hex_dump_bytes() in my kernel logs, but I don't have CONFIG_DYNAMIC_DEBUG enabled nor do I have DEBUG defined in my build. The problem is that print_hex_dump_bytes() calls a wrapper function in lib/hexdump.c that calls print_hex_dump() with KERN_DEBUG level. There are three cases to consider here 1. CONFIG_DYNAMIC_DEBUG=y --> call dynamic_hex_dum() 2. CONFIG_DYNAMIC_DEBUG=n && DEBUG --> call print_hex_dump() 3. CONFIG_DYNAMIC_DEBUG=n && !DEBUG --> stub it out Right now, that last case isn't detected and we still call print_hex_dump() from the stub wrapper. Let's make print_hex_dump_bytes() only call print_hex_dump_debug() so that it works properly in all cases. Case #1, print_hex_dump_debug() calls dynamic_hex_dump() and we get same behavior. Case #2, print_hex_dump_debug() calls print_hex_dump() with KERN_DEBUG and we get the same behavior. Case #3, print_hex_dump_debug() is a nop, changing behavior to what we want, i.e. print nothing. Link: http://lkml.kernel.org/r/20190816235624.115280-1-swboyd@chromium.org Signed-off-by: Stephen Boyd <swboyd@chromium.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25lib/extable.c: add missing prototypesValdis Kletnieks1-0/+1
When building with W=1, a number of warnings are issued: CC lib/extable.o lib/extable.c:63:6: warning: no previous prototype for 'sort_extable' [-Wmissing-prototypes] 63 | void sort_extable(struct exception_table_entry *start, | ^~~~~~~~~~~~ lib/extable.c:75:6: warning: no previous prototype for 'trim_init_extable' [-Wmissing-prototypes] 75 | void trim_init_extable(struct module *m) | ^~~~~~~~~~~~~~~~~ lib/extable.c:115:1: warning: no previous prototype for 'search_extable' [-Wmissing-prototypes] 115 | search_extable(const struct exception_table_entry *base, | ^~~~~~~~~~~~~~ Add the missing #include for the prototypes. Link: http://lkml.kernel.org/r/45574.1565235784@turing-police Signed-off-by: Valdis Kletnieks <valdis.kletnieks@vt.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25lib/generic-radix-tree.c: make 2 functions static inlineValdis Kletnieks1-2/+2
When building with W=1, we get some warnings: l CC lib/generic-radix-tree.o lib/generic-radix-tree.c:39:10: warning: no previous prototype for 'genradix_root_to_depth' [-Wmissing-prototypes] 39 | unsigned genradix_root_to_depth(struct genradix_root *r) | ^~~~~~~~~~~~~~~~~~~~~~ lib/generic-radix-tree.c:44:23: warning: no previous prototype for 'genradix_root_to_node' [-Wmissing-prototypes] 44 | struct genradix_node *genradix_root_to_node(struct genradix_root *r) | ^~~~~~~~~~~~~~~~~~~~~ They're not used anywhere else, so make them static inline. Link: http://lkml.kernel.org/r/46923.1565236485@turing-police Signed-off-by: Valdis Kletnieks <valdis.kletnieks@vt.edu> Cc: Kent Overstreet <kent.overstreet@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25strscpy: reject buffer sizes larger than INT_MAXKees Cook1-1/+1
As already done for snprintf(), add a check in strscpy() for giant (i.e. likely negative and/or miscalculated) copy sizes, WARN, and error out. Link: http://lkml.kernel.org/r/201907260928.23DE35406@keescook Signed-off-by: Kees Cook <keescook@chromium.org> Cc: Joe Perches <joe@perches.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Yann Droneaud <ydroneaud@opteya.com> Cc: David Laight <David.Laight@aculab.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Stephen Kitt <steve@sk2.org> Cc: Jann Horn <jannh@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25include/trace/events/writeback.h: fix -Wstringop-truncation warningsQian Cai1-18/+20
There are many of those warnings. In file included from ./arch/powerpc/include/asm/paca.h:15, from ./arch/powerpc/include/asm/current.h:13, from ./include/linux/thread_info.h:21, from ./include/asm-generic/preempt.h:5, from ./arch/powerpc/include/generated/asm/preempt.h:1, from ./include/linux/preempt.h:78, from ./include/linux/spinlock.h:51, from fs/fs-writeback.c:19: In function 'strncpy', inlined from 'perf_trace_writeback_page_template' at ./include/trace/events/writeback.h:56:1: ./include/linux/string.h:260:9: warning: '__builtin_strncpy' specified bound 32 equals destination size [-Wstringop-truncation] return __builtin_strncpy(p, q, size); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Fix it by using the new strscpy_pad() which was introduced in "lib/string: Add strscpy_pad() function" and will always be NUL-terminated instead of strncpy(). Also, change strlcpy() to use strscpy_pad() in this file for consistency. Link: http://lkml.kernel.org/r/1564075099-27750-1-git-send-email-cai@lca.pw Fixes: 455b2864686d ("writeback: Initial tracing support") Fixes: 028c2dd184c0 ("writeback: Add tracing to balance_dirty_pages") Fixes: e84d0a4f8e39 ("writeback: trace event writeback_queue_io") Fixes: b48c104d2211 ("writeback: trace event bdi_dirty_ratelimit") Fixes: cc1676d917f3 ("writeback: Move requeueing when I_SYNC set to writeback_sb_inodes()") Fixes: 9fb0a7da0c52 ("writeback: add more tracepoints") Signed-off-by: Qian Cai <cai@lca.pw> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Tobin C. Harding <tobin@kernel.org> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Tejun Heo <tj@kernel.org> Cc: Dave Chinner <dchinner@redhat.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Joe Perches <joe@perches.com> Cc: Kees Cook <keescook@chromium.org> Cc: Jann Horn <jannh@google.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Nitin Gote <nitin.r.gote@intel.com> Cc: Rasmus Villemoes <rasmus.villemoes@prevas.dk> Cc: Stephen Kitt <steve@sk2.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25kernel-doc: core-api: include string.h into core-apiJoe Perches3-6/+12
core-api should show all the various string functions including the newly added stracpy and stracpy_pad. Miscellanea: o Update the Returns: value for strscpy o fix a defect with %NUL) [joe@perches.com: correct return of -E2BIG descriptions] Link: http://lkml.kernel.org/r/29f998b4c1a9d69fbeae70500ba0daa4b340c546.1563889130.git.joe@perches.com Link: http://lkml.kernel.org/r/224a6ebf39955f4107c0c376d66155d970e46733.1563841972.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Reviewed-by: Kees Cook <keescook@chromium.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Stephen Kitt <steve@sk2.org> Cc: Nitin Gote <nitin.r.gote@intel.com> Cc: Rasmus Villemoes <rasmus.villemoes@prevas.dk> Cc: Jann Horn <jannh@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25augmented rbtree: rework the RB_DECLARE_CALLBACKS macro definitionMichel Lespinasse2-24/+24
Change the definition of the RBCOMPUTE function. The propagate callback repeatedly calls RBCOMPUTE as it moves from leaf to root. it wants to stop recomputing once the augmented subtree information doesn't change. This was previously checked using the == operator, but that only works when the augmented subtree information is a scalar field. This commit modifies the RBCOMPUTE function so that it now sets the augmented subtree information instead of returning it, and returns a boolean value indicating if the propagate callback should stop. The motivation for this change is that I want to introduce augmented rbtree uses where the augmented data for the subtree is a struct instead of a scalar. Link: http://lkml.kernel.org/r/20190703040156.56953-4-walken@google.com Signed-off-by: Michel Lespinasse <walken@google.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: David Howells <dhowells@redhat.com> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: Uladzislau Rezki <urezki@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25augmented rbtree: add new RB_DECLARE_CALLBACKS_MAX macroMichel Lespinasse8-98/+115
Add RB_DECLARE_CALLBACKS_MAX, which generates augmented rbtree callbacks for the case where the augmented value is a scalar whose definition follows a max(f(node)) pattern. This actually covers all present uses of RB_DECLARE_CALLBACKS, and saves some (source) code duplication in the various RBCOMPUTE function definitions. [walken@google.com: fix mm/vmalloc.c] Link: http://lkml.kernel.org/r/CANN689FXgK13wDYNh1zKxdipeTuALG4eKvKpsdZqKFJ-rvtGiQ@mail.gmail.com [walken@google.com: re-add check to check_augmented()] Link: http://lkml.kernel.org/r/20190727022027.GA86863@google.com Link: http://lkml.kernel.org/r/20190703040156.56953-3-walken@google.com Signed-off-by: Michel Lespinasse <walken@google.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: David Howells <dhowells@redhat.com> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: Uladzislau Rezki <urezki@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25augmented rbtree: add comments for RB_DECLARE_CALLBACKS macroMichel Lespinasse2-42/+66
Patch series "make RB_DECLARE_CALLBACKS more generic", v3. These changes are intended to make the RB_DECLARE_CALLBACKS macro more generic (allowing the aubmented subtree information to be a struct instead of a scalar). I have verified the compiled lib/interval_tree.o and mm/mmap.o files to check that they didn't change. This held as expected for interval_tree.o; mmap.o did have some changes which could be reverted by marking __vma_link_rb as noinline. I did not add such a change to the patchset; I felt it was reasonable enough to leave the inlining decision up to the compiler. This patch (of 3): Add a short comment summarizing the arguments to RB_DECLARE_CALLBACKS. The arguments are also now capitalized. This copies the style of the INTERVAL_TREE_DEFINE macro. No functional changes in this commit, only comments and capitalization. Link: http://lkml.kernel.org/r/20190703040156.56953-2-walken@google.com Signed-off-by: Michel Lespinasse <walken@google.com> Acked-by: Davidlohr Bueso <dbueso@suse.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: David Howells <dhowells@redhat.com> Cc: Uladzislau Rezki <urezki@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25rbtree: avoid generating code twice for the cached versions (tools copy)Michel Lespinasse3-77/+62
As was already noted in rbtree.h, the logic to cache rb_first (or rb_last) can easily be implemented externally to the core rbtree api. This commit takes the changes applied to the include/linux/ and lib/ rbtree files in 9f973cb38088 ("lib/rbtree: avoid generating code twice for the cached versions"), and applies these to the tools/include/linux/ and tools/lib/ files as well to keep them synchronized. Link: http://lkml.kernel.org/r/20190703034812.53002-1-walken@google.com Signed-off-by: Michel Lespinasse <walken@google.com> Cc: David Howells <dhowells@redhat.com> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25kernel/elfcore.c: include proper prototypesValdis Kletnieks1-0/+1
When building with W=1, gcc properly complains that there's no prototypes: CC kernel/elfcore.o kernel/elfcore.c:7:17: warning: no previous prototype for 'elf_core_extra_phdrs' [-Wmissing-prototypes] 7 | Elf_Half __weak elf_core_extra_phdrs(void) | ^~~~~~~~~~~~~~~~~~~~ kernel/elfcore.c:12:12: warning: no previous prototype for 'elf_core_write_extra_phdrs' [-Wmissing-prototypes] 12 | int __weak elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/elfcore.c:17:12: warning: no previous prototype for 'elf_core_write_extra_data' [-Wmissing-prototypes] 17 | int __weak elf_core_write_extra_data(struct coredump_params *cprm) | ^~~~~~~~~~~~~~~~~~~~~~~~~ kernel/elfcore.c:22:15: warning: no previous prototype for 'elf_core_extra_data_size' [-Wmissing-prototypes] 22 | size_t __weak elf_core_extra_data_size(void) | ^~~~~~~~~~~~~~~~~~~~~~~~ Provide the include file so gcc is happy, and we don't have potential code drift Link: http://lkml.kernel.org/r/29875.1565224705@turing-police Signed-off-by: Valdis Kletnieks <valdis.kletnieks@vt.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25linux/coff.h: add include guardMasahiro Yamada1-0/+5
Add a header include guard just in case. My motivation is to allow Kbuild to detect missing include guard: https://patchwork.kernel.org/patch/11063011/ Before I enable this checker I want to fix as many headers as possible. Link: http://lkml.kernel.org/r/20190728154728.11126-1-yamada.masahiro@socionext.com Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-25memcg, kmem: do not fail __GFP_NOFAIL chargesMichal Hocko1-0/+10
Thomas has noticed the following NULL ptr dereference when using cgroup v1 kmem limit: BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 3 PID: 16923 Comm: gtk-update-icon Not tainted 4.19.51 #42 Hardware name: Gigabyte Technology Co., Ltd. Z97X-Gaming G1/Z97X-Gaming G1, BIOS F9 07/31/2015 RIP: 0010:create_empty_buffers+0x24/0x100 Code: cd 0f 1f 44 00 00 0f 1f 44 00 00 41 54 49 89 d4 ba 01 00 00 00 55 53 48 89 fb e8 97 fe ff ff 48 89 c5 48 89 c2 eb 03 48 89 ca <48> 8b 4a 08 4c 09 22 48 85 c9 75 f1 48 89 6a 08 48 8b 43 18 48 8d RSP: 0018:ffff927ac1b37bf8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: fffff2d4429fd740 RCX: 0000000100097149 RDX: 0000000000000000 RSI: 0000000000000082 RDI: ffff9075a99fbe00 RBP: 0000000000000000 R08: fffff2d440949cc8 R09: 00000000000960c0 R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000000 R13: ffff907601f18360 R14: 0000000000002000 R15: 0000000000001000 FS: 00007fb55b288bc0(0000) GS:ffff90761f8c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 000000007aebc002 CR4: 00000000001606e0 Call Trace: create_page_buffers+0x4d/0x60 __block_write_begin_int+0x8e/0x5a0 ? ext4_inode_attach_jinode.part.82+0xb0/0xb0 ? jbd2__journal_start+0xd7/0x1f0 ext4_da_write_begin+0x112/0x3d0 generic_perform_write+0xf1/0x1b0 ? file_update_time+0x70/0x140 __generic_file_write_iter+0x141/0x1a0 ext4_file_write_iter+0xef/0x3b0 __vfs_write+0x17e/0x1e0 vfs_write+0xa5/0x1a0 ksys_write+0x57/0xd0 do_syscall_64+0x55/0x160 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Tetsuo then noticed that this is because the __memcg_kmem_charge_memcg fails __GFP_NOFAIL charge when the kmem limit is reached. This is a wrong behavior because nofail allocations are not allowed to fail. Normal charge path simply forces the charge even if that means to cross the limit. Kmem accounting should be doing the same. Link: http://lkml.kernel.org/r/20190906125608.32129-1-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Reported-by: Thomas Lindroth <thomas.lindroth@gmail.com> Debugged-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Thomas Lindroth <thomas.lindroth@gmail.com> Cc: Shakeel Butt <shakeelb@google.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24Merge branch 'i2c/for-5.4' of ↵Linus Torvalds42-267/+795
git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux Pull i2c updates from Wolfram Sang: - new driver for ICY, an Amiga Zorro card :) - axxia driver gained slave mode support, NXP driver gained ACPI - the slave EEPROM backend gained 16 bit address support - and lots of regular driver updates and reworks * 'i2c/for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (52 commits) i2c: tegra: Move suspend handling to NOIRQ phase i2c: imx: ACPI support for NXP i2c controller i2c: uniphier(-f): remove all dev_dbg() i2c: uniphier(-f): use devm_platform_ioremap_resource() i2c: slave-eeprom: Add comment about address handling i2c: exynos5: Remove IRQF_ONESHOT i2c: stm32f7: Make structure stm32f7_i2c_algo constant i2c: cht-wc: drop check because i2c_unregister_device() is NULL safe i2c-eeprom_slave: Add support for more eeprom models i2c: fsi: Add of_put_node() before break i2c: synquacer: Make synquacer_i2c_ops constant i2c: hix5hd2: Remove IRQF_ONESHOT i2c: i801: Use iTCO version 6 in Cannon Lake PCH and beyond watchdog: iTCO: Add support for Cannon Lake PCH iTCO i2c: iproc: Make bcm_iproc_i2c_quirks constant i2c: iproc: Add full name of devicetree node to adapter name i2c: piix4: Add ACPI support i2c: piix4: Fix probing of reserved ports on AMD Family 16h Model 30h i2c: ocores: use request_any_context_irq() to register IRQ handler i2c: designware: Fix optional reset error handling ...
2019-09-24Merge tag 'sound-fix-5.4-rc1' of ↵Linus Torvalds13-24/+67
git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound Pull sound fixes from Takashi Iwai: "A few small remaining wrap-up for this merge window. Most of patches are device-specific (HD-audio and USB-audio quirks, FireWire, pcm316a, fsl, rsnd, Atmel, and TI fixes), while there is a simple fix (actually two commits) for ASoC core" * tag 'sound-fix-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: ALSA: usb-audio: Add DSD support for EVGA NU Audio ALSA: hda - Add laptop imic fixup for ASUS M9V laptop ASoC: ti: fix SND_SOC_DM365_VOICE_CODEC dependencies ASoC: pcm3168a: The codec does not support S32_LE ASoC: core: use list_del_init and move it back to soc_cleanup_component ALSA: hda/realtek - PCI quirk for Medion E4254 ALSA: hda - Apply AMD controller workaround for Raven platform ASoC: rsnd: do error check after rsnd_channel_normalization() ASoC: atmel_ssc_dai: Remove wrong spinlock usage ASoC: core: delete component->card_list in soc_remove_component only ASoC: fsl_sai: Fix noise when using EDMA ALSA: usb-audio: Add Hiby device family to quirks for native DSD support ALSA: hda/realtek - Fix alienware headset mic ALSA: dice: fix wrong packet parameter for Alesis iO26
2019-09-24Merge tag 'for-5.4/io_uring-2019-09-24' of git://git.kernel.dk/linux-blockLinus Torvalds2-24/+219
Pull more io_uring updates from Jens Axboe: "A collection of later fixes and additions, that weren't quite ready for pushing out with the initial pull request. This contains: - Fix potential use-after-free of shadow requests (Jackie) - Fix potential OOM crash in request allocation (Jackie) - kmalloc+memcpy -> kmemdup cleanup (Jackie) - Fix poll crash regression (me) - Fix SQ thread not being nice and giving up CPU for !PREEMPT (me) - Add support for timeouts, making it easier to do epoll_wait() conversions, for instance (me) - Ensure io_uring works without f_ops->read_iter() and f_ops->write_iter() (me)" * tag 'for-5.4/io_uring-2019-09-24' of git://git.kernel.dk/linux-block: io_uring: correctly handle non ->{read,write}_iter() file_operations io_uring: IORING_OP_TIMEOUT support io_uring: use cond_resched() in sqthread io_uring: fix potential crash issue due to io_get_req failure io_uring: ensure poll commands clear ->sqe io_uring: fix use-after-free of shadow_req io_uring: use kmemdup instead of kmalloc and memcpy
2019-09-24Merge tag 'for-5.4/post-2019-09-24' of git://git.kernel.dk/linux-blockLinus Torvalds14-164/+237
Pull more block updates from Jens Axboe: "Some later additions that weren't quite done for the first pull request, and also a few fixes that have arrived since. This contains: - Kill silly pktcdvd warning on attempting to register a non-scsi passthrough device (me) - Use symbolic constants for the block t10 protection types, and switch to handling it in core rather than in the drivers (Max) - libahci platform missing node put fix (Nishka) - Small series of fixes for BFQ (Paolo) - Fix possible nbd crash (Xiubo)" * tag 'for-5.4/post-2019-09-24' of git://git.kernel.dk/linux-block: block: drop device references in bsg_queue_rq() block: t10-pi: fix -Wswitch warning pktcdvd: remove warning on attempting to register non-passthrough dev ata: libahci_platform: Add of_node_put() before loop exit nbd: fix possible page fault for nbd disk nbd: rename the runtime flags as NBD_RT_ prefixed block, bfq: push up injection only after setting service time block, bfq: increase update frequency of inject limit block, bfq: reduce upper bound for inject limit to max_rq_in_driver+1 block, bfq: update inject limit only after injection occurred block: centralize PI remapping logic to the block layer block: use symbolic constants for t10_pi type
2019-09-24Merge branch 'akpm' (patches from Andrew)Linus Torvalds204-2444/+2273
Merge updates from Andrew Morton: - a few hot fixes - ocfs2 updates - almost all of -mm (slab-generic, slab, slub, kmemleak, kasan, cleanups, debug, pagecache, memcg, gup, pagemap, memory-hotplug, sparsemem, vmalloc, initialization, z3fold, compaction, mempolicy, oom-kill, hugetlb, migration, thp, mmap, madvise, shmem, zswap, zsmalloc) * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (132 commits) mm/zsmalloc.c: fix a -Wunused-function warning zswap: do not map same object twice zswap: use movable memory if zpool support allocate movable memory zpool: add malloc_support_movable to zpool_driver shmem: fix obsolete comment in shmem_getpage_gfp() mm/madvise: reduce code duplication in error handling paths mm: mmap: increase sockets maximum memory size pgoff for 32bits mm/mmap.c: refine find_vma_prev() with rb_last() riscv: make mmap allocation top-down by default mips: use generic mmap top-down layout and brk randomization mips: replace arch specific way to determine 32bit task with generic version mips: adjust brk randomization offset to fit generic version mips: use STACK_TOP when computing mmap base address mips: properly account for stack randomization and stack guard gap arm: use generic mmap top-down layout and brk randomization arm: use STACK_TOP when computing mmap base address arm: properly account for stack randomization and stack guard gap arm64, mm: make randomization selected by generic topdown mmap layout arm64, mm: move generic mmap layout functions to mm arm64: consider stack randomization for mmap base only when necessary ...
2019-09-24mm/zsmalloc.c: fix a -Wunused-function warningQian Cai1-4/+0
set_zspage_inuse() was introduced in the commit 4f42047bbde0 ("zsmalloc: use accessor") but all the users of it were removed later by the commits, bdb0af7ca8f0 ("zsmalloc: factor page chain functionality out") 3783689a1aa8 ("zsmalloc: introduce zspage structure") so the function can be safely removed now. Link: http://lkml.kernel.org/r/1568658408-19374-1-git-send-email-cai@lca.pw Signed-off-by: Qian Cai <cai@lca.pw> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24zswap: do not map same object twiceVitaly Wool1-4/+3
zswap_writeback_entry() maps a handle to read swpentry first, and then in the most common case it would map the same handle again. This is ok when zbud is the backend since its mapping callback is plain and simple, but it slows things down for z3fold. Since there's hardly a point in unmapping a handle _that_ fast as zswap_writeback_entry() does when it reads swpentry, the suggestion is to keep the handle mapped till the end. Link: http://lkml.kernel.org/r/20190916004640.b453167d3556c4093af4cf7d@gmail.com Signed-off-by: Vitaly Wool <vitalywool@gmail.com> Reviewed-by: Dan Streetman <ddstreet@ieee.org> Cc: Shakeel Butt <shakeelb@google.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> Cc: Seth Jennings <sjenning@redhat.com> Cc: Vitaly Wool <vitalywool@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24zswap: use movable memory if zpool support allocate movable memoryHui Zhu1-3/+5
This is the third version that was updated according to the comments from Sergey Senozhatsky https://lkml.org/lkml/2019/5/29/73 and Shakeel Butt https://lkml.org/lkml/2019/6/4/973 zswap compresses swap pages into a dynamically allocated RAM-based memory pool. The memory pool should be zbud, z3fold or zsmalloc. All of them will allocate unmovable pages. It will increase the number of unmovable page blocks that will bad for anti-fragment. zsmalloc support page migration if request movable page: handle = zs_malloc(zram->mem_pool, comp_len, GFP_NOIO | __GFP_HIGHMEM | __GFP_MOVABLE); And commit "zpool: Add malloc_support_movable to zpool_driver" add zpool_malloc_support_movable check malloc_support_movable to make sure if a zpool support allocate movable memory. This commit let zswap allocate block with gfp __GFP_HIGHMEM | __GFP_MOVABLE if zpool support allocate movable memory. Following part is test log in a pc that has 8G memory and 2G swap. Without this commit: ~# echo lz4 > /sys/module/zswap/parameters/compressor ~# echo zsmalloc > /sys/module/zswap/parameters/zpool ~# echo 1 > /sys/module/zswap/parameters/enabled ~# swapon /swapfile ~# cd /home/teawater/kernel/vm-scalability/ /home/teawater/kernel/vm-scalability# export unit_size=$((9 * 1024 * 1024 * 1024)) /home/teawater/kernel/vm-scalability# ./case-anon-w-seq 2717908992 bytes / 4826062 usecs = 549973 KB/s 2717908992 bytes / 4864201 usecs = 545661 KB/s 2717908992 bytes / 4867015 usecs = 545346 KB/s 2717908992 bytes / 4915485 usecs = 539968 KB/s 397853 usecs to free memory 357820 usecs to free memory 421333 usecs to free memory 420454 usecs to free memory /home/teawater/kernel/vm-scalability# cat /proc/pagetypeinfo Page block order: 9 Pages per block: 512 Free pages count per migrate type at order 0 1 2 3 4 5 6 7 8 9 10 Node 0, zone DMA, type Unmovable 1 1 1 0 2 1 1 0 1 0 0 Node 0, zone DMA, type Movable 0 0 0 0 0 0 0 0 0 1 3 Node 0, zone DMA, type Reclaimable 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA, type HighAtomic 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA, type CMA 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA, type Isolate 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA32, type Unmovable 6 5 8 6 6 5 4 1 1 1 0 Node 0, zone DMA32, type Movable 25 20 20 19 22 15 14 11 11 5 767 Node 0, zone DMA32, type Reclaimable 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA32, type HighAtomic 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA32, type CMA 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA32, type Isolate 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone Normal, type Unmovable 4753 5588 5159 4613 3712 2520 1448 594 188 11 0 Node 0, zone Normal, type Movable 16 3 457 2648 2143 1435 860 459 223 224 296 Node 0, zone Normal, type Reclaimable 0 0 44 38 11 2 0 0 0 0 0 Node 0, zone Normal, type HighAtomic 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone Normal, type CMA 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone Normal, type Isolate 0 0 0 0 0 0 0 0 0 0 0 Number of blocks type Unmovable Movable Reclaimable HighAtomic CMA Isolate Node 0, zone DMA 1 7 0 0 0 0 Node 0, zone DMA32 4 1652 0 0 0 0 Node 0, zone Normal 931 1485 15 0 0 0 With this commit: ~# echo lz4 > /sys/module/zswap/parameters/compressor ~# echo zsmalloc > /sys/module/zswap/parameters/zpool ~# echo 1 > /sys/module/zswap/parameters/enabled ~# swapon /swapfile ~# cd /home/teawater/kernel/vm-scalability/ /home/teawater/kernel/vm-scalability# export unit_size=$((9 * 1024 * 1024 * 1024)) /home/teawater/kernel/vm-scalability# ./case-anon-w-seq 2717908992 bytes / 4689240 usecs = 566020 KB/s 2717908992 bytes / 4760605 usecs = 557535 KB/s 2717908992 bytes / 4803621 usecs = 552543 KB/s 2717908992 bytes / 5069828 usecs = 523530 KB/s 431546 usecs to free memory 383397 usecs to free memory 456454 usecs to free memory 224487 usecs to free memory /home/teawater/kernel/vm-scalability# cat /proc/pagetypeinfo Page block order: 9 Pages per block: 512 Free pages count per migrate type at order 0 1 2 3 4 5 6 7 8 9 10 Node 0, zone DMA, type Unmovable 1 1 1 0 2 1 1 0 1 0 0 Node 0, zone DMA, type Movable 0 0 0 0 0 0 0 0 0 1 3 Node 0, zone DMA, type Reclaimable 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA, type HighAtomic 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA, type CMA 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA, type Isolate 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA32, type Unmovable 10 8 10 9 10 4 3 2 3 0 0 Node 0, zone DMA32, type Movable 18 12 14 16 16 11 9 5 5 6 775 Node 0, zone DMA32, type Reclaimable 0 0 0 0 0 0 0 0 0 0 1 Node 0, zone DMA32, type HighAtomic 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA32, type CMA 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA32, type Isolate 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone Normal, type Unmovable 2669 1236 452 118 37 14 4 1 2 3 0 Node 0, zone Normal, type Movable 3850 6086 5274 4327 3510 2494 1520 934 438 220 470 Node 0, zone Normal, type Reclaimable 56 93 155 124 47 31 17 7 3 0 0 Node 0, zone Normal, type HighAtomic 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone Normal, type CMA 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone Normal, type Isolate 0 0 0 0 0 0 0 0 0 0 0 Number of blocks type Unmovable Movable Reclaimable HighAtomic CMA Isolate Node 0, zone DMA 1 7 0 0 0 0 Node 0, zone DMA32 4 1650 2 0 0 0 Node 0, zone Normal 79 2326 26 0 0 0 You can see that the number of unmovable page blocks is decreased when the kernel has this commit. Link: http://lkml.kernel.org/r/20190605100630.13293-2-teawaterz@linux.alibaba.com Signed-off-by: Hui Zhu <teawaterz@linux.alibaba.com> Reviewed-by: Shakeel Butt <shakeelb@google.com> Cc: Dan Streetman <ddstreet@ieee.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Nitin Gupta <ngupta@vflare.org> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> Cc: Seth Jennings <sjenning@redhat.com> Cc: Vitaly Wool <vitalywool@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24zpool: add malloc_support_movable to zpool_driverHui Zhu3-9/+29
As a zpool_driver, zsmalloc can allocate movable memory because it support migate pages. But zbud and z3fold cannot allocate movable memory. Add malloc_support_movable to zpool_driver. If a zpool_driver support allocate movable memory, set it to true. And add zpool_malloc_support_movable check malloc_support_movable to make sure if a zpool support allocate movable memory. Link: http://lkml.kernel.org/r/20190605100630.13293-1-teawaterz@linux.alibaba.com Signed-off-by: Hui Zhu <teawaterz@linux.alibaba.com> Reviewed-by: Shakeel Butt <shakeelb@google.com> Cc: Dan Streetman <ddstreet@ieee.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Nitin Gupta <ngupta@vflare.org> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> Cc: Seth Jennings <sjenning@redhat.com> Cc: Vitaly Wool <vitalywool@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24shmem: fix obsolete comment in shmem_getpage_gfp()Miles Chen1-1/+1
Replace "fault_mm" with "vmf" in code comment because commit cfda05267f7b ("userfaultfd: shmem: add userfaultfd hook for shared memory faults") has changed the prototpye of shmem_getpage_gfp() - pass vmf instead of fault_mm to the function. Before: static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, struct page **pagep, enum sgp_type sgp, gfp_t gfp, struct mm_struct *fault_mm, int *fault_type); After: static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, struct page **pagep, enum sgp_type sgp, gfp_t gfp, struct vm_area_struct *vma, struct vm_fault *vmf, vm_fault_t *fault_type); Link: http://lkml.kernel.org/r/20190816100204.9781-1-miles.chen@mediatek.com Signed-off-by: Miles Chen <miles.chen@mediatek.com> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24mm/madvise: reduce code duplication in error handling pathsMike Rapoport1-36/+16
madvise_behavior() converts -ENOMEM to -EAGAIN in several places using identical code. Move that code to a common error handling path. No functional changes. Link: http://lkml.kernel.org/r/1564640896-1210-1-git-send-email-rppt@linux.ibm.com Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Acked-by: Pankaj Gupta <pagupta@redhat.com> Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24mm: mmap: increase sockets maximum memory size pgoff for 32bitsIvan Khoronzhuk1-0/+3
The AF_XDP sockets umem mapping interface uses XDP_UMEM_PGOFF_FILL_RING and XDP_UMEM_PGOFF_COMPLETION_RING offsets. These offsets are established already and are part of the configuration interface. But for 32-bit systems, using AF_XDP socket configuration, these values are too large to pass the maximum allowed file size verification. The offsets can be tuned off, but instead of changing the existing interface, let's extend the max allowed file size for sockets. No one has been using this until this patch with 32 bits as without this fix af_xdp sockets can't be used at all, so it unblocks af_xdp socket usage for 32bit systems. All list of mmap cbs for sockets was verified for side effects and all of them contain dummy cb - sock_no_mmap() at this moment, except the following: xsk_mmap() - it's what this fix is needed for. tcp_mmap() - doesn't have obvious issues with pgoff - no any references on it. packet_mmap() - return -EINVAL if it's even set. Link: http://lkml.kernel.org/r/20190812124326.32146-1-ivan.khoronzhuk@linaro.org Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Björn Töpel <bjorn.topel@intel.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Magnus Karlsson <magnus.karlsson@intel.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: David Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24mm/mmap.c: refine find_vma_prev() with rb_last()Wei Yang1-6/+3
When addr is out of range of the whole rb_tree, pprev will point to the right-most node. rb_tree facility already provides a helper function, rb_last(), to do this task. We can leverage this instead of reimplementing it. This patch refines find_vma_prev() with rb_last() to make it a little nicer to read. [akpm@linux-foundation.org: little cleanup, per Vlastimil] Link: http://lkml.kernel.org/r/20190809001928.4950-1-richardw.yang@linux.intel.com Signed-off-by: Wei Yang <richardw.yang@linux.intel.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Michal Hocko <mhocko@suse.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24riscv: make mmap allocation top-down by defaultAlexandre Ghiti1-0/+12
In order to avoid wasting user address space by using bottom-up mmap allocation scheme, prefer top-down scheme when possible. Before: root@qemuriscv64:~# cat /proc/self/maps 00010000-00016000 r-xp 00000000 fe:00 6389 /bin/cat.coreutils 00016000-00017000 r--p 00005000 fe:00 6389 /bin/cat.coreutils 00017000-00018000 rw-p 00006000 fe:00 6389 /bin/cat.coreutils 00018000-00039000 rw-p 00000000 00:00 0 [heap] 1555556000-155556d000 r-xp 00000000 fe:00 7193 /lib/ld-2.28.so 155556d000-155556e000 r--p 00016000 fe:00 7193 /lib/ld-2.28.so 155556e000-155556f000 rw-p 00017000 fe:00 7193 /lib/ld-2.28.so 155556f000-1555570000 rw-p 00000000 00:00 0 1555570000-1555572000 r-xp 00000000 00:00 0 [vdso] 1555574000-1555576000 rw-p 00000000 00:00 0 1555576000-1555674000 r-xp 00000000 fe:00 7187 /lib/libc-2.28.so 1555674000-1555678000 r--p 000fd000 fe:00 7187 /lib/libc-2.28.so 1555678000-155567a000 rw-p 00101000 fe:00 7187 /lib/libc-2.28.so 155567a000-15556a0000 rw-p 00000000 00:00 0 3fffb90000-3fffbb1000 rw-p 00000000 00:00 0 [stack] After: root@qemuriscv64:~# cat /proc/self/maps 00010000-00016000 r-xp 00000000 fe:00 6389 /bin/cat.coreutils 00016000-00017000 r--p 00005000 fe:00 6389 /bin/cat.coreutils 00017000-00018000 rw-p 00006000 fe:00 6389 /bin/cat.coreutils 2de81000-2dea2000 rw-p 00000000 00:00 0 [heap] 3ff7eb6000-3ff7ed8000 rw-p 00000000 00:00 0 3ff7ed8000-3ff7fd6000 r-xp 00000000 fe:00 7187 /lib/libc-2.28.so 3ff7fd6000-3ff7fda000 r--p 000fd000 fe:00 7187 /lib/libc-2.28.so 3ff7fda000-3ff7fdc000 rw-p 00101000 fe:00 7187 /lib/libc-2.28.so 3ff7fdc000-3ff7fe2000 rw-p 00000000 00:00 0 3ff7fe4000-3ff7fe6000 r-xp 00000000 00:00 0 [vdso] 3ff7fe6000-3ff7ffd000 r-xp 00000000 fe:00 7193 /lib/ld-2.28.so 3ff7ffd000-3ff7ffe000 r--p 00016000 fe:00 7193 /lib/ld-2.28.so 3ff7ffe000-3ff7fff000 rw-p 00017000 fe:00 7193 /lib/ld-2.28.so 3ff7fff000-3ff8000000 rw-p 00000000 00:00 0 3fff888000-3fff8a9000 rw-p 00000000 00:00 0 [stack] [alex@ghiti.fr: v6] Link: http://lkml.kernel.org/r/20190808061756.19712-15-alex@ghiti.fr Link: http://lkml.kernel.org/r/20190730055113.23635-15-alex@ghiti.fr Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Acked-by: Paul Walmsley <paul.walmsley@sifive.com> [arch/riscv] Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: James Hogan <jhogan@kernel.org> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24mips: use generic mmap top-down layout and brk randomizationAlexandre Ghiti3-102/+1
mips uses a top-down layout by default that exactly fits the generic functions, so get rid of arch specific code and use the generic version by selecting ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT. As ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT selects ARCH_HAS_ELF_RANDOMIZE, use the generic version of arch_randomize_brk since it also fits. Note that this commit also removes the possibility for mips to have elf randomization and no MMU: without MMU, the security added by randomization is worth nothing. Link: http://lkml.kernel.org/r/20190730055113.23635-14-alex@ghiti.fr Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Acked-by: Paul Burton <paul.burton@mips.com> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Christoph Hellwig <hch@lst.de> Cc: James Hogan <jhogan@kernel.org> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24mips: replace arch specific way to determine 32bit task with generic versionAlexandre Ghiti1-1/+2
Mips uses TASK_IS_32BIT_ADDR to determine if a task is 32bit, but this define is mips specific and other arches do not have it: instead, use !IS_ENABLED(CONFIG_64BIT) || is_compat_task() condition. Link: http://lkml.kernel.org/r/20190730055113.23635-13-alex@ghiti.fr Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Acked-by: Paul Burton <paul.burton@mips.com> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Christoph Hellwig <hch@lst.de> Cc: James Hogan <jhogan@kernel.org> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24mips: adjust brk randomization offset to fit generic versionAlexandre Ghiti1-3/+4
This commit simply bumps up to 32MB and 1GB the random offset of brk, compared to 8MB and 256MB, for 32bit and 64bit respectively. Link: http://lkml.kernel.org/r/20190730055113.23635-12-alex@ghiti.fr Suggested-by: Kees Cook <keescook@chromium.org> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Acked-by: Paul Burton <paul.burton@mips.com> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Christoph Hellwig <hch@lst.de> Cc: James Hogan <jhogan@kernel.org> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24mips: use STACK_TOP when computing mmap base addressAlexandre Ghiti1-2/+2
mmap base address must be computed wrt stack top address, using TASK_SIZE is wrong since STACK_TOP and TASK_SIZE are not equivalent. Link: http://lkml.kernel.org/r/20190730055113.23635-11-alex@ghiti.fr Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Acked-by: Kees Cook <keescook@chromium.org> Acked-by: Paul Burton <paul.burton@mips.com> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Christoph Hellwig <hch@lst.de> Cc: James Hogan <jhogan@kernel.org> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24mips: properly account for stack randomization and stack guard gapAlexandre Ghiti1-2/+12
This commit takes care of stack randomization and stack guard gap when computing mmap base address and checks if the task asked for randomization. This fixes the problem uncovered and not fixed for arm here: https://lkml.kernel.org/r/20170622200033.25714-1-riel@redhat.com Link: http://lkml.kernel.org/r/20190730055113.23635-10-alex@ghiti.fr Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Acked-by: Kees Cook <keescook@chromium.org> Acked-by: Paul Burton <paul.burton@mips.com> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Christoph Hellwig <hch@lst.de> Cc: James Hogan <jhogan@kernel.org> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24arm: use generic mmap top-down layout and brk randomizationAlexandre Ghiti4-69/+1
arm uses a top-down mmap layout by default that exactly fits the generic functions, so get rid of arch specific code and use the generic version by selecting ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT. As ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT selects ARCH_HAS_ELF_RANDOMIZE, use the generic version of arch_randomize_brk since it also fits. Note that this commit also removes the possibility for arm to have elf randomization and no MMU: without MMU, the security added by randomization is worth nothing. Note that it is safe to remove STACK_RND_MASK since it matches the default value. Link: http://lkml.kernel.org/r/20190730055113.23635-9-alex@ghiti.fr Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Acked-by: Kees Cook <keescook@chromium.org> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Christoph Hellwig <hch@lst.de> Cc: James Hogan <jhogan@kernel.org> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24arm: use STACK_TOP when computing mmap base addressAlexandre Ghiti1-2/+2
mmap base address must be computed wrt stack top address, using TASK_SIZE is wrong since STACK_TOP and TASK_SIZE are not equivalent. Link: http://lkml.kernel.org/r/20190730055113.23635-8-alex@ghiti.fr Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Acked-by: Kees Cook <keescook@chromium.org> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Christoph Hellwig <hch@lst.de> Cc: James Hogan <jhogan@kernel.org> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24arm: properly account for stack randomization and stack guard gapAlexandre Ghiti1-2/+12
This commit takes care of stack randomization and stack guard gap when computing mmap base address and checks if the task asked for randomization. This fixes the problem uncovered and not fixed for arm here: https://lkml.kernel.org/r/20170622200033.25714-1-riel@redhat.com Link: http://lkml.kernel.org/r/20190730055113.23635-7-alex@ghiti.fr Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Acked-by: Kees Cook <keescook@chromium.org> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Christoph Hellwig <hch@lst.de> Cc: James Hogan <jhogan@kernel.org> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24arm64, mm: make randomization selected by generic topdown mmap layoutAlexandre Ghiti4-11/+10
This commits selects ARCH_HAS_ELF_RANDOMIZE when an arch uses the generic topdown mmap layout functions so that this security feature is on by default. Note that this commit also removes the possibility for arm64 to have elf randomization and no MMU: without MMU, the security added by randomization is worth nothing. Link: http://lkml.kernel.org/r/20190730055113.23635-6-alex@ghiti.fr Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Kees Cook <keescook@chromium.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@infradead.org> Cc: James Hogan <jhogan@kernel.org> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24arm64, mm: move generic mmap layout functions to mmAlexandre Ghiti6-81/+92
arm64 handles top-down mmap layout in a way that can be easily reused by other architectures, so make it available in mm. It then introduces a new config ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT that can be set by other architectures to benefit from those functions. Note that this new config depends on MMU being enabled, if selected without MMU support, a warning will be thrown. Link: http://lkml.kernel.org/r/20190730055113.23635-5-alex@ghiti.fr Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Suggested-by: Christoph Hellwig <hch@infradead.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Kees Cook <keescook@chromium.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: James Hogan <jhogan@kernel.org> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24arm64: consider stack randomization for mmap base only when necessaryAlexandre Ghiti1-1/+5
Do not offset mmap base address because of stack randomization if current task does not want randomization. Note that x86 already implements this behaviour. Link: http://lkml.kernel.org/r/20190730055113.23635-4-alex@ghiti.fr Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Kees Cook <keescook@chromium.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@infradead.org> Cc: James Hogan <jhogan@kernel.org> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24arm64: make use of is_compat_task instead of hardcoding this testAlexandre Ghiti1-1/+1
Each architecture has its own way to determine if a task is a compat task, by using is_compat_task in arch_mmap_rnd, it allows more genericity and then it prepares its moving to mm/. Link: http://lkml.kernel.org/r/20190730055113.23635-3-alex@ghiti.fr Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Kees Cook <keescook@chromium.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@infradead.org> Cc: James Hogan <jhogan@kernel.org> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24mm, fs: move randomize_stack_top from fs to mmAlexandre Ghiti3-20/+24
Patch series "Provide generic top-down mmap layout functions", v6. This series introduces generic functions to make top-down mmap layout easily accessible to architectures, in particular riscv which was the initial goal of this series. The generic implementation was taken from arm64 and used successively by arm, mips and finally riscv. Note that in addition the series fixes 2 issues: - stack randomization was taken into account even if not necessary. - [1] fixed an issue with mmap base which did not take into account randomization but did not report it to arm and mips, so by moving arm64 into a generic library, this problem is now fixed for both architectures. This work is an effort to factorize architecture functions to avoid code duplication and oversights as in [1]. [1]: https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1429066.html This patch (of 14): This preparatory commit moves this function so that further introduction of generic topdown mmap layout is contained only in mm/util.c. Link: http://lkml.kernel.org/r/20190730055113.23635-2-alex@ghiti.fr Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Acked-by: Kees Cook <keescook@chromium.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Burton <paul.burton@mips.com> Cc: James Hogan <jhogan@kernel.org> Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24uprobe: collapse THP pmd after removing all uprobesSong Liu1-0/+9
After all uprobes are removed from the huge page (with PTE pgtable), it is possible to collapse the pmd and benefit from THP again. This patch does the collapse by calling collapse_pte_mapped_thp(). Link: http://lkml.kernel.org/r/20190815164525.1848545-7-songliubraving@fb.com Signed-off-by: Song Liu <songliubraving@fb.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reported-by: kbuild test robot <lkp@intel.com> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24khugepaged: enable collapse pmd for pte-mapped THPSong Liu2-4/+200
khugepaged needs exclusive mmap_sem to access page table. When it fails to lock mmap_sem, the page will fault in as pte-mapped THP. As the page is already a THP, khugepaged will not handle this pmd again. This patch enables the khugepaged to retry collapse the page table. struct mm_slot (in khugepaged.c) is extended with an array, containing addresses of pte-mapped THPs. We use array here for simplicity. We can easily replace it with more advanced data structures when needed. In khugepaged_scan_mm_slot(), if the mm contains pte-mapped THP, we try to collapse the page table. Since collapse may happen at an later time, some pages may already fault in. collapse_pte_mapped_thp() is added to properly handle these pages. collapse_pte_mapped_thp() also double checks whether all ptes in this pmd are mapping to the same THP. This is necessary because some subpage of the THP may be replaced, for example by uprobe. In such cases, it is not possible to collapse the pmd. [kirill.shutemov@linux.intel.com: add comments for retract_page_tables()] Link: http://lkml.kernel.org/r/20190816145443.6ard3iilytc6jlgv@box Link: http://lkml.kernel.org/r/20190815164525.1848545-6-songliubraving@fb.com Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Suggested-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24uprobe: use FOLL_SPLIT_PMD instead of FOLL_SPLITSong Liu1-4/+2
Use the newly added FOLL_SPLIT_PMD in uprobe. This preserves the huge page when the uprobe is enabled. When the uprobe is disabled, newer instances of the same application could still benefit from huge page. For the next step, we will enable khugepaged to regroup the pmd, so that existing instances of the application could also benefit from huge page after the uprobe is disabled. Link: http://lkml.kernel.org/r/20190815164525.1848545-5-songliubraving@fb.com Signed-off-by: Song Liu <songliubraving@fb.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24mm, thp: introduce FOLL_SPLIT_PMDSong Liu2-2/+7
Introduce a new foll_flag: FOLL_SPLIT_PMD. As the name says FOLL_SPLIT_PMD splits huge pmd for given mm_struct, the underlining huge page stays as-is. FOLL_SPLIT_PMD is useful for cases where we need to use regular pages, but would switch back to huge page and huge pmd on. One of such example is uprobe. The following patches use FOLL_SPLIT_PMD in uprobe. Link: http://lkml.kernel.org/r/20190815164525.1848545-4-songliubraving@fb.com Signed-off-by: Song Liu <songliubraving@fb.com> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-18 04:58:32 +0000