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2017-05-08make help: add tools help targetRandy Dunlap1-2/+6
Add a top-level Makefile help target for Userspace tools. Also make each help "heading" end with a colon ':'. Link: http://lkml.kernel.org/r/55c986ff-3966-3e47-2984-7349da2cce51@infradead.org Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-05-02Merge tag 'docs-4.12' of git://git.lwn.net/linuxLinus Torvalds1-2/+2
Pull documentation update from Jonathan Corbet: "A reasonably busy cycle for documentation this time around. There is a new guide for user-space API documents, rather sparsely populated at the moment, but it's a start. Markus improved the infrastructure for converting diagrams. Mauro has converted much of the USB documentation over to RST. Plus the usual set of fixes, improvements, and tweaks. There's a bit more than the usual amount of reaching out of Documentation/ to fix comments elsewhere in the tree; I have acks for those where I could get them" * tag 'docs-4.12' of git://git.lwn.net/linux: (74 commits) docs: Fix a couple typos docs: Fix a spelling error in vfio-mediated-device.txt docs: Fix a spelling error in ioctl-number.txt MAINTAINERS: update file entry for HSI subsystem Documentation: allow installing man pages to a user defined directory Doc/PM: Sync with intel_powerclamp code behavior zr364xx.rst: usb/devices is now at /sys/kernel/debug/ usb.rst: move documentation from proc_usb_info.txt to USB ReST book convert philips.txt to ReST and add to media docs docs-rst: usb: update old usbfs-related documentation arm: Documentation: update a path name docs: process/4.Coding.rst: Fix a couple of document refs docs-rst: fix usb cross-references usb: gadget.h: be consistent at kernel doc macros usb: composite.h: fix two warnings when building docs usb: get rid of some ReST doc build errors usb.rst: get rid of some Sphinx errors usb/URB.txt: convert to ReST and update it usb/persist.txt: convert to ReST and add to driver-api book usb/hotplug.txt: convert to ReST and add to driver-api book ...
2017-04-30Linux 4.11v4.11Linus Torvalds1-1/+1
2017-04-23Linux 4.11-rc8v4.11-rc8Linus Torvalds1-1/+1
2017-04-16Linux 4.11-rc7v4.11-rc7Linus Torvalds1-1/+1
2017-04-09Linux 4.11-rc6v4.11-rc6Linus Torvalds1-1/+1
2017-04-05Merge tag 'kbuild-fixes-v4.11' of ↵Linus Torvalds1-7/+7
git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild Pull Kbuild fixes from Masahiro Yamada: - hand-off primary maintainership of Kbuild - fix build warnings - fix build error when GCOV is enabled with old compiler - fix HAVE_ASM_GOTO check when GCC plugin is enabled * tag 'kbuild-fixes-v4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: gconfig: remove misleading parentheses around a condition jump label: fix passing kbuild_cflags when checking for asm goto support Kbuild: use cc-disable-warning consistently for maybe-uninitialized kbuild: external module build warnings when KBUILD_OUTPUT set and W=1 MAINTAINERS: add Masahiro Yamada as a Kbuild maintainer
2017-04-02Linux 4.11-rc5v4.11-rc5Linus Torvalds1-1/+1
2017-03-31sparse doc: fix reference pathCao jin1-2/+2
Documentation/sparse.txt has been moved to Documentation/dev-tools/sparse.rst Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2017-03-26Linux 4.11-rc4v4.11-rc4Linus Torvalds1-1/+1
2017-03-22jump label: fix passing kbuild_cflags when checking for asm goto supportGleb Fotengauer-Malinovskiy1-6/+6
The latest change of asm goto support check added passing of KBUILD_CFLAGS to compiler. When these flags reference gcc plugins that are not built yet, the check fails. When one runs "make bzImage" followed by "make modules", the kernel is always built with HAVE_JUMP_LABEL disabled, while the modules are built depending on CONFIG_JUMP_LABEL. If HAVE_JUMP_LABEL macro happens to be different, modules are built with undefined references, e.g.: ERROR: "static_key_slow_inc" [net/netfilter/xt_TEE.ko] undefined! ERROR: "static_key_slow_dec" [net/netfilter/xt_TEE.ko] undefined! ERROR: "static_key_slow_dec" [net/netfilter/nft_meta.ko] undefined! ERROR: "static_key_slow_inc" [net/netfilter/nft_meta.ko] undefined! ERROR: "nf_hooks_needed" [net/netfilter/ipvs/ip_vs.ko] undefined! ERROR: "nf_hooks_needed" [net/ipv6/ipv6.ko] undefined! ERROR: "static_key_count" [net/ipv6/ipv6.ko] undefined! ERROR: "static_key_slow_inc" [net/ipv6/ipv6.ko] undefined! This change moves the check before all these references are added to KBUILD_CFLAGS. This is correct because subsequent KBUILD_CFLAGS modifications are not relevant to this check. Reported-by: Anton V. Boyarshinov <boyarsh@altlinux.org> Fixes: 35f860f9ba6a ("jump label: pass kbuild_cflags when checking for asm goto support") Cc: stable@vger.kernel.org # v4.10 Signed-off-by: Gleb Fotengauer-Malinovskiy <glebfm@altlinux.org> Signed-off-by: Dmitry V. Levin <ldv@altlinux.org> Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Acked-by: David Lin <dtwlin@google.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-03-19Linux 4.11-rc3v4.11-rc3Linus Torvalds1-1/+1
2017-03-17Kbuild: use cc-disable-warning consistently for maybe-uninitializedArnd Bergmann1-1/+1
In commit a76bcf557ef4 ("Kbuild: enable -Wmaybe-uninitialized warning for "make W=1""), I reverted another change that happened to fix a problem with old compilers, and now we get this report again with old compilers (prior to gcc-4.8) and GCOV enabled: cc1: warnings being treated as errors drivers/gpu/drm/i915/intel_ringbuffer.c: In function 'intel_ring_setup_status_page': drivers/gpu/drm/i915/intel_ringbuffer.c:438: error: 'mmio.reg' may be used uninitialized in this function At top level: >> cc1: error: unrecognized command line option "-Wno-maybe-uninitialized" The problem is that we turn off the warning conditionally in a number of places as we should, but one of them does it unconditionally. Instead, change it to call cc-disable-warning as we do elsewhere. The original patch that caused it was merged into linux-4.7, then 4.8 removed the change and 4.9 brought it back, so we probably want a backport to 4.9 once this is merged. Use a ':=' assignment instead of '=' to force the cc-disable-warning call to only be evaluated once instead of every time. Cc: stable@vger.kernel.org Fixes: a76bcf557ef4 ("Kbuild: enable -Wmaybe-uninitialized warning for "make W=1"") Fixes: e72e2dfe7c16 ("gcov: disable -Wmaybe-uninitialized warning") Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-03-12Linux 4.11-rc2v4.11-rc2Linus Torvalds1-1/+1
2017-03-05Linux 4.11-rc1v4.11-rc1Linus Torvalds1-2/+2
2017-02-28Merge branch 'core-urgent-for-linus' of ↵Linus Torvalds1-12/+12
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull objtool fixes from Ingo Molnar: "A handful of objtool fixes related to unreachable code, plus a build fix for out of tree modules" * 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: objtool: Enclose contents of unreachable() macro in a block objtool: Prevent GCC from merging annotate_unreachable() objtool: Improve detection of BUG() and other dead ends objtool: Fix CONFIG_STACK_VALIDATION=y warning for out-of-tree modules
2017-02-22Merge tag 'docs-4.11' of git://git.lwn.net/linuxLinus Torvalds1-1/+1
Pull documentation updates from Jonathan Corbet: "A slightly quieter cycle for documentation this time around. Three more DocBook template files have been converted to RST; only 21 to go. There are various build improvements and the usual array of documentation improvements and fixes" * tag 'docs-4.11' of git://git.lwn.net/linux: (44 commits) docs / driver-api: Fix structure references in device_link.rst PM / docs: Fix structure references in device.rst Add a target to check broken external links in the Documentation Documentation: Fix linux-api list typo Documentation: DocBook/Makefile comment typo Improve sparse documentation Documentation: make Makefile.sphinx no-ops quieter Documentation: DMA-ISA-LPC.txt Documentation: input: fix path to input code definitions docs: Remove the copyright year from conf.py docs: Fix a warning in the Korean HOWTO.rst translation PM / sleep / docs: Convert PM notifiers document to reST PM / core / docs: Convert sleep states API document to reST PM / core: Update kerneldoc comments in pm.h doc-rst: Fix recursive make invocation from macros doc-rst: Delete output of failed dot-SVG conversion doc-rst: Break shell command sequences on failure Documentation/sphinx: make targets independent of Sphinx work for HAVE_SPHINX=0 doc-rst: fixed cleandoc target when used with O=dir Documentation/sphinx: prevent generation of .pyc files in the source tree ...
2017-02-20Merge branch 'perf-core-for-linus' of ↵Linus Torvalds1-2/+4
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull perf updates from Ingo Molnar: "On the kernel side the main changes in this cycle were: - Add Intel Kaby Lake CPU support (Srinivas Pandruvada) - AMD uncore driver updates for fam17 (Janakarajan Natarajan) - Intel/PT updates and core events optimizations and cleanups (Alexander Shishkin) - cgroups events fixes (David Carrillo-Cisneros) - kprobes improvements (Masami Hiramatsu) - ... plus misc fixes and updates. On the tooling side the main changes were: - Support clang build in tools/{perf,lib/{bpf,traceevent,api}} with CC=clang, to, for instance, take advantage of better warnings (Arnaldo Carvalho de Melo): - Introduce the 'delta-abs' 'perf diff' compute method, that orders the histogram entries by the absolute value of the percentage delta for a function in two perf.data files, i.e. the functions that changed the most (increase or decrease in samples) comes first (Namhyung Kim) - Add support for parsing Intel uncore vendor event files and add uncore vendor events for the Intel server processors (Haswell, Broadwell, IvyBridge), Xeon Phi (Knights Landing) and Broadwell DE (Andi Kleen) - Introduce 'perf ftrace' a perf front end to the kernel's ftrace function and function_graph tracer, defaulting to the "function_graph" tracer, more work will be done in reviving this effort, forward porting it from its initial patch submission (Namhyung Kim) - Add 'e' and 'c' hotkeys to expand/collapse call chains for a single hist entry in the 'perf report' and 'perf top' TUI (Jiri Olsa) - Account thread wait time (off CPU time) separately: sleep, iowait and preempt, based on the prev_state of the last event, show the breakdown when using "perf sched timehist --state" (Namhyumg Kim) - Add more triggers to switch the output file (perf.data.TIMESTAMP). Now, in addition to switching to a different output file when receiving a SIGUSR2, one can also specify file size and time based triggers: perf record -a --switch-output=signal is equivalent to what we had before: perf record -a --switch-output While we can also ask for the file to be "sliced" by size, taking into account that that will happen only when we get woken up by the kernel, i.e. one has to take into account the --mmap-pages (the size of the perf mmap ring buffer): perf record -a --switch-output=2G will break the perf.data output into multiple files limited to 2GB of samples, right when generating the output. For time based samples, alert() will be used, so to have 1 minute limited perf.data output files: perf record -a --switch-output=1m (Jiri Olsa) - Improve 'perf trace' (Arnaldo Carvalho de Melo) - 'perf kallsyms' toy tool to look for extended symbol information on the running kernel and demonstrate the machine/thread/symbol APIs for use in other tools, such as 'perf probe' (Arnaldo Carvalho de Melo) - ... plus tons of other changes, see the shortlog and Git log for details" * 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (131 commits) perf tools: Add missing parse_events_error() prototype perf pmu: Fix check for unset alias->unit array perf tools: Be consistent on the type of map->symbols[] interator perf intel pt decoder: clang has no -Wno-override-init perf evsel: Do not put a variable sized type not at the end of a struct perf probe: Avoid accessing uninitialized 'map' variable perf tools: Do not put a variable sized type not at the end of a struct perf record: Do not put a variable sized type not at the end of a struct perf tests: Synthesize struct instead of using field after variable sized type perf bench numa: Make sure dprintf() is not defined Revert "perf bench futex: Sanitize numeric parameters" tools lib subcmd: Make it an error to pass a signed value to OPTION_UINTEGER tools: Set the maximum optimization level according to the compiler being used tools: Suppress request for warning options not existent in clang samples/bpf: Reset global variables samples/bpf: Ignore already processed ELF sections samples/bpf: Add missing header perf symbols: dso->name is an array, no need to check it against NULL perf tests record: No need to test an array against NULL perf symbols: No need to check if sym->name is NULL ...
2017-02-20objtool: Fix CONFIG_STACK_VALIDATION=y warning for out-of-tree modulesJosh Poimboeuf1-12/+12
When building a CONFIG_STACK_VALIDATION enabled kernel without the libelf devel package installed, the Makefile prints a warning: "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel" But when building an out-of-tree module, the warning doesn't show. Instead it tries to use objtool, and the build fails with: /bin/sh: ./tools/objtool/objtool: No such file or directory Make sure the warning and the disabling of objtool occur in all cases, by moving the CONFIG_STACK_VALIDATION checks outside the 'ifeq ($(KBUILD_EXTMOD),)' block in the Makefile. Tested-By: Marc MERLIN <marc@merlins.org> Suggested-by: Jessica Yu <jeyu@redhat.com> Reported-by: Marc MERLIN <marc@merlins.org> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Reviewed-by: Jessica Yu <jeyu@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Michal Marek <mmarek@suse.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes: 3b27a0c85d70 ("objtool: Detect and warn if libelf is missing and don't break the build") Link: http://lkml.kernel.org/r/b3088ae4a8698143d4851965793c61fec2135b1f.1487182864.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-02-19Linux 4.10v4.10Linus Torvalds1-1/+1
2017-02-15Add a target to check broken external links in the DocumentationRémy Léone1-1/+1
Documentation shouldn't have broken links. sphinx linkcheck builder scans all documents for external links, tries to open them with urllib2, and writes an overview which ones are broken and redirected to standard output and to output.txt in the output directory. Reviewed-by: Jani Nikula <jani.nikula@intel.com> Tested-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Rémy Léone <remy.leone@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2017-02-14Merge tag 'v4.10-rc8' into perf/core, to pick up fixesIngo Molnar1-2/+2
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-02-12Linux 4.10-rc8v4.10-rc8Linus Torvalds1-1/+1
2017-02-05Linux 4.10-rc7v4.10-rc7Linus Torvalds1-1/+1
2017-02-03jump label: pass kbuild_cflags when checking for asm goto supportDavid Lin1-1/+1
Some versions of ARM GCC compiler such as Android toolchain throws in a '-fpic' flag by default. This causes the gcc-goto check script to fail although some config would have '-fno-pic' flag in the KBUILD_CFLAGS. This patch passes the KBUILD_CFLAGS to the check script so that the script does not rely on the default config from different compilers. Link: http://lkml.kernel.org/r/20170120234329.78868-1-dtwlin@google.com Signed-off-by: David Lin <dtwlin@google.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Michal Marek <mmarek@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-02-01Merge tag 'perf-core-for-mingo-4.11-20170201' of ↵Ingo Molnar1-2/+4
git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo: New features: - Allow configuring a 'perf ftrace' default --tracer (Taeung Song) Infrastructure changes: - Sync tools/arch/{powerpc,arm}/include/uapi/asm/kvm.h and tools/arch/x86/include/asm/cpufeatures.h (Ingo Molnar) - Add BPF program file system pinning APIs and respective 'perf test' entry (Joe Stringer) - Make tools tree support 'make -s' (Josh Poimboeuf) - Reference count maps in callchains, fixing SEGFAULT when referencing maps after it is freed (Krister Johansen) - Create for_each_event trace points iterator (Taeung Song) - Do not consider an error not to have any perfconfig file (Arnaldo Carvalho de Melo - Propagate perf_config() errors (Arnaldo Carvalho de Melo) Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-01-29Linux 4.10-rc6v4.10-rc6Linus Torvalds1-2/+2
2017-01-26tools build: Add tools tree support for 'make -s'Josh Poimboeuf1-2/+4
When doing a kernel build with 'make -s', everything is silenced except the objtool build. That's because the tools tree support for silent builds is some combination of missing and broken. Three changes are needed to fix it: - Makefile: propagate '-s' to the sub-make's MAKEFLAGS variable so the tools Makefiles can see it. - tools/scripts/Makefile.include: fix the tools Makefiles' ability to recognize '-s'. The MAKE_VERSION and MAKEFLAGS checks are copied from the top-level Makefile. This silences the "DESCEND objtool" message. - tools/build/Makefile.build: add support to the tools Build files for recognizing '-s'. Again the MAKE_VERSION and MAKEFLAGS checks are copied from the top-level Makefile. This silences all the object compile/link messages. Reported-and-Tested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Michal Marek <mmarek@suse.com> Link: http://lkml.kernel.org/r/e8967562ef640c3ae9a76da4ae0f4e47df737c34.1484799200.git.jpoimboe@redhat.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2017-01-22Linux 4.10-rc5v4.10-rc5Linus Torvalds1-2/+2
2017-01-15Linux 4.10-rc4v4.10-rc4Linus Torvalds1-1/+1
2017-01-08Linux 4.10-rc3v4.10-rc3Linus Torvalds1-1/+1
2017-01-01Linux 4.10-rc2v4.10-rc2Linus Torvalds1-1/+1
2016-12-25Linux 4.10-rc1v4.10-rc1Linus Torvalds1-2/+2
2016-12-11Linux 4.9v4.9Linus Torvalds1-2/+2
2016-12-04Linux 4.9-rc8v4.9-rc8Linus Torvalds1-1/+1
2016-12-02kbuild: fix building bzImage with CONFIG_TRIM_UNUSED_KSYMS enabledNicolas Pitre1-1/+8
When building a specific target such as bzImage, modules aren't normally built. However if CONFIG_TRIM_UNUSED_KSYMS is enabled, no built modules means none of the exported symbols are used and therefore they will all be trimmed away from the final kernel. A subsequent "make modules" will fail because modpost cannot find the needed symbols for those modules in the kernel binary. Let's make sure modules are also built whenever CONFIG_TRIM_UNUSED_KSYMS is enabled and that the kernel binary is properly rebuilt accordingly. Signed-off-by: Nicolas Pitre <nico@linaro.org> Tested-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-12-01kbuild: make sure autoksyms.h exists earlyNicolas Pitre1-2/+0
Some people are able to trigger a race where autoksyms.h is used before its empty version is even created. Let's create it at the same time as the directory holding it is created. Signed-off-by: Nicolas Pitre <nico@linaro.org> Tested-by: Prarit Bhargava <prarit@redhat.com> Tested-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-11-27Linux 4.9-rc7v4.9-rc7Linus Torvalds1-1/+1
2016-11-20Linux 4.9-rc6v4.9-rc6Linus Torvalds1-1/+1
2016-11-18Merge branch 'rc-fixes' of ↵Linus Torvalds1-2/+3
git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild Pull kbuild fixes from Michal Marek: "Here are some regression fixes for kbuild: - modversion support for exported asm symbols (Nick Piggin). The affected architectures need separate patches adding asm-prototypes.h. - fix rebuilds of lib-ksyms.o (Nick Piggin) - -fno-PIE builds (Sebastian Siewior and Borislav Petkov). This is not a kernel regression, but one of the Debian gcc package. Nevertheless, it's quite annoying, so I think it should go into mainline and stable now" * 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: kbuild: Steal gcc's pie from the very beginning kbuild: be more careful about matching preprocessed asm ___EXPORT_SYMBOL x86/kexec: add -fno-PIE scripts/has-stack-protector: add -fno-PIE kbuild: add -fno-PIE kbuild: modversions for EXPORT_SYMBOL() for asm kbuild: prevent lib-ksyms.o rebuilds
2016-11-15kbuild: Steal gcc's pie from the very beginningBorislav Petkov1-4/+3
So Sebastian turned off the PIE for kernel builds but that was too late - Kbuild.include already uses KBUILD_CFLAGS and trying to disable gcc options with, say cc-disable-warning, fails: gcc -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs ... -Wno-sign-compare -fno-asynchronous-unwind-tables -Wframe-address -c -x c /dev/null -o .31392.tmp /dev/null:1:0: error: code model kernel does not support PIC mode because that returns an error and we can't disable the warning. For example in this case: KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) which leads to gcc issuing all those warnings again. So let's turn off PIE/PIC at the earliest possible moment, when we declare KBUILD_CFLAGS so that cc-disable-warning picks it up too. Also, we need the $(call cc-option ...) because -fno-PIE is supported since gcc v3.4 and our lowest supported gcc version is 3.2 right now. Signed-off-by: Borislav Petkov <bp@suse.de> Cc: stable@vger.kernel.org Cc: Ben Hutchings <ben@decadent.org.uk> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Michal Marek <mmarek@suse.com>
2016-11-13Linux 4.9-rc5v4.9-rc5Linus Torvalds1-1/+1
2016-11-11Kbuild: enable -Wmaybe-uninitialized warning for "make W=1"Arnd Bergmann1-4/+6
Traditionally, we have always had warnings about uninitialized variables enabled, as this is part of -Wall, and generally a good idea [1], but it also always produced false positives, mainly because this is a variation of the halting problem and provably impossible to get right in all cases [2]. Various people have identified cases that are particularly bad for false positives, and in commit e74fc973b6e5 ("Turn off -Wmaybe-uninitialized when building with -Os"), I turned off the warning for any build that was done with CC_OPTIMIZE_FOR_SIZE. This drastically reduced the number of false positive warnings in the default build but unfortunately had the side effect of turning the warning off completely in 'allmodconfig' builds, which in turn led to a lot of warnings (both actual bugs, and remaining false positives) to go in unnoticed. With commit 877417e6ffb9 ("Kbuild: change CC_OPTIMIZE_FOR_SIZE definition") enabled the warning again for allmodconfig builds in v4.7 and in v4.8-rc1, I had finally managed to address all warnings I get in an ARM allmodconfig build and most other maybe-uninitialized warnings for ARM randconfig builds. However, commit 6e8d666e9253 ("Disable "maybe-uninitialized" warning globally") was merged at the same time and disabled it completely for all configurations, because of false-positive warnings on x86 that I had not addressed until then. This caused a lot of actual bugs to get merged into mainline, and I sent several dozen patches for these during the v4.9 development cycle. Most of these are actual bugs, some are for correct code that is safe because it is only called under external constraints that make it impossible to run into the case that gcc sees, and in a few cases gcc is just stupid and finds something that can obviously never happen. I have now done a few thousand randconfig builds on x86 and collected all patches that I needed to address every single warning I got (I can provide the combined patch for the other warnings if anyone is interested), so I hope we can get the warning back and let people catch the actual bugs earlier. This reverts the change to disable the warning completely and for now brings it back at the "make W=1" level, so we can get it merged into mainline without introducing false positives. A follow-up patch enables it on all levels unless some configuration option turns it off because of false-positives. Link: https://rusty.ozlabs.org/?p=232 [1] Link: https://gcc.gnu.org/wiki/Better_Uninitialized_Warnings [2] Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-11-08kbuild: add -fno-PIESebastian Andrzej Siewior1-0/+2
Debian started to build the gcc with -fPIE by default so the kernel build ends before it starts properly with: |kernel/bounds.c:1:0: error: code model kernel does not support PIC mode Also add to KBUILD_AFLAGS due to: |gcc -Wp,-MD,arch/x86/entry/vdso/vdso32/.note.o.d … -mfentry -DCC_USING_FENTRY … vdso/vdso32/note.S |arch/x86/entry/vdso/vdso32/note.S:1:0: sorry, unimplemented: -mfentry isn’t supported for 32-bit in combination with -fpic Tagging it stable so it is possible to compile recent stable kernels as well. Cc: stable@vger.kernel.org Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Michal Marek <mmarek@suse.com>
2016-11-05Linux 4.9-rc4v4.9-rc4Linus Torvalds1-1/+1
2016-10-29Linux 4.9-rc3v4.9-rc3Linus Torvalds1-1/+1
2016-10-23Linux 4.9-rc2v4.9-rc2Linus Torvalds1-1/+1
2016-10-15Linux 4.9-rc1v4.9-rc1Linus Torvalds1-2/+2
2016-10-14Merge tag 'linux-kselftest-4.9-rc1-update' of ↵Linus Torvalds1-3/+0
git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest Pull kselftest updates from Shuah Khan: "This update consists of: - Fixes and improvements to existing tests - Moving code from Documentation to selftests, samples, and tools: * Moves dnotify_test, prctl, ptp, vDSO, ia64, watchdog, and networking tests from Documentation to selftests. * Moves mic/mpssd, misc-devices/mei, timers, watchdog, auxdisplay, and blackfin examples from Documentation to samples. * Moves accounting, laptops/dslm, and pcmcia/crc32hash tools from Documentation to tools. * Deletes BUILD_DOCSRC and its dependencies" * tag 'linux-kselftest-4.9-rc1-update' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (21 commits) selftests/futex: Check ANSI terminal color support Doc: update 00-INDEX files to reflect the runnable code move samples: move blackfin gptimers-example from Documentation tools: move pcmcia crc32hash tool from Documentation tools: move laptops dslm tool from Documentation tools: move accounting tool from Documentation samples: move auxdisplay example code from Documentation samples: move watchdog example code from Documentation samples: move timers example code from Documentation samples: move misc-devices/mei example code from Documentation samples: move mic/mpssd example code from Documentation selftests: Move networking/timestamping from Documentation selftests: move watchdog tests from Documentation/watchdog selftests: move ia64 tests from Documentation/ia64 selftests: move vDSO tests from Documentation/vDSO selftests: move ptp tests from Documentation/ptp selftests: move prctl tests from Documentation/prctl selftests: move dnotify_test from Documentation/filesystems selftests/timers: Add missing error code assignment before test selftests/zram: replace ZRAM_LZ4_COMPRESS ...
2016-10-14Merge branch 'kbuild' of ↵Linus Torvalds1-3/+16
git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild Pull kbuild updates from Michal Marek: - EXPORT_SYMBOL for asm source by Al Viro. This does bring a regression, because genksyms no longer generates checksums for these symbols (CONFIG_MODVERSIONS). Nick Piggin is working on a patch to fix this. Plus, we are talking about functions like strcpy(), which rarely change prototypes. - Fixes for PPC fallout of the above by Stephen Rothwell and Nick Piggin - fixdep speedup by Alexey Dobriyan. - preparatory work by Nick Piggin to allow architectures to build with -ffunction-sections, -fdata-sections and --gc-sections - CONFIG_THIN_ARCHIVES support by Stephen Rothwell - fix for filenames with colons in the initramfs source by me. * 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: (22 commits) initramfs: Escape colons in depfile ppc: there is no clear_pages to export powerpc/64: whitelist unresolved modversions CRCs kbuild: -ffunction-sections fix for archs with conflicting sections kbuild: add arch specific post-link Makefile kbuild: allow archs to select link dead code/data elimination kbuild: allow architectures to use thin archives instead of ld -r kbuild: Regenerate genksyms lexer kbuild: genksyms fix for typeof handling fixdep: faster CONFIG_ search ia64: move exports to definitions sparc32: debride memcpy.S a bit [sparc] unify 32bit and 64bit string.h sparc: move exports to definitions ppc: move exports to definitions arm: move exports to definitions s390: move exports to definitions m68k: move exports to definitions alpha: move exports to actual definitions x86: move exports to actual definitions ...
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