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2013-11-13backlight: lp855x: use devm_backlight_device_register()Jingoo Han1-16/+4
Use devm_backlight_device_register() to make cleanup paths simpler. Also, unnecessary lp855x_backlight_unregister() is removed. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: lm3533_bl: use devm_backlight_device_register()Jingoo Han1-6/+4
Use devm_backlight_device_register() to make cleanup paths simpler. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: kb3886_bl: use devm_backlight_device_register()Jingoo Han1-14/+4
Use devm_backlight_device_register() to make cleanup paths simpler, and remove unnecessary remove(). Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: gpio_backlight: use devm_backlight_device_register()Jingoo Han1-11/+3
Use devm_backlight_device_register() to make cleanup paths simpler, and remove unnecessary remove(). Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: generic_bl: use devm_backlight_device_register()Jingoo Han1-4/+2
Use devm_backlight_device_register() to make cleanup paths simpler. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: ep93xx: use devm_backlight_device_register()Jingoo Han1-11/+2
Use devm_backlight_device_register() to make cleanup paths simpler, and remove unnecessary remove(). Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: da9052_bl: use devm_backlight_device_register()Jingoo Han1-3/+3
Use devm_backlight_device_register() to make cleanup paths simpler. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: da903x_bl: use devm_backlight_device_register()Jingoo Han1-11/+3
Use devm_backlight_device_register() to make cleanup paths simpler, and remove unnecessary remove(). Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: bd6107: use devm_backlight_device_register()Jingoo Han1-2/+2
Use devm_backlight_device_register() to make cleanup paths simpler. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: atmel-pwm-bl: use devm_backlight_device_register()Jingoo Han1-6/+4
Use devm_backlight_device_register() to make cleanup paths simpler. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: as3711_bl: use devm_backlight_device_register()Jingoo Han1-21/+5
Use devm_backlight_device_register() to make cleanup paths simpler, and remove unnecessary remove(). Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: adp8870: use devm_backlight_device_register()Jingoo Han1-7/+4
Use devm_backlight_device_register() to make cleanup paths simpler. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: adp8860: use devm_backlight_device_register()Jingoo Han1-7/+4
Use devm_backlight_device_register() to make cleanup paths simpler. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: adp5520: use devm_backlight_device_register()Jingoo Han1-5/+4
Use devm_backlight_device_register() to make cleanup paths simpler. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: aat2870: use devm_backlight_device_register()Jingoo Han1-7/+4
Use devm_backlight_device_register() to make cleanup paths simpler. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: 88pm860x_bl: use devm_backlight_device_register()Jingoo Han1-14/+2
Use devm_backlight_device_register() to make cleanup paths simpler, and remove unnecessary remove(). Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: use dev_get_platdata()Jingoo Han32-46/+44
Use the wrapper function for retrieving the platform data instead of accessing dev->platform_data directly. This is a cosmetic change to make the code simpler and enhance the readability. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: lp8788: staticize 'default_bl_config'Jingoo Han1-1/+1
Fix the following sparse warning: drivers/video/backlight/lp8788_bl.c:55:25: warning: symbol 'default_bl_config' was not declared. Should it be static? Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: lm3639: don't mix different enum typesJingoo Han1-4/+7
Don't mix different enum types to fix the sparse warnings. drivers/video/backlight/lm3639_bl.c:80:51: warning: mixing different enum types drivers/video/backlight/lm3639_bl.c:80:51: int enum lm3639_fleds versus drivers/video/backlight/lm3639_bl.c:80:51: int enum lm3639_bleds drivers/video/backlight/lm3639_bl.c:82:51: warning: mixing different enum types drivers/video/backlight/lm3639_bl.c:82:51: int enum lm3639_fleds versus drivers/video/backlight/lm3639_bl.c:82:51: int enum lm3639_bleds Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: ld9040: Staticize local variable gamma_tableJingoo Han1-1/+3
Fix the following sparse warnings: drivers/video/backlight/ld9040_gamma.h:172:3: warning: symbol 'gamma_table' was not declared. Should it be static? Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: lm3630: fix sparse warningDaniel Jeong1-2/+2
This patch is to fix sparse warning due to mixing different enum type. Signed-off-by: Daniel Jeong <gshark.jeong@gmail.com> Cc: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13drivers/video/backlight/lm3630a_bl.c: potential NULL deref in probe()Dan Carpenter1-13/+12
We dereference "pdata" later in the function so we can't leave it as NULL. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13drivers/video/backlight/lm3630a_bl.c: fix signedness bug in lm3630a_chip_init()Dan Carpenter1-1/+1
"rval" needs to be signed for the error handling to work. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: lm3630: apply chip revisionDaniel Jeong6-536/+552
The LM3630 chip was revised by TI and chip name was also changed to LM3630A. And register map, default values and initial sequences are changed. The files, lm3630_bl.{c,h} are replaced by lm3630a_bl.{c,h} You can find more information about LM3630A(datasheet, evm etc) at http://www.ti.com/product/lm3630a Signed-off-by: Daniel Jeong <gshark.jeong@gmail.com> Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13backlight: lp855x_bl: support new LP8555 deviceMilo Kim5-7/+67
LP8555 is one of the LP855x family devices. This device needs pre_init_device() and post_init_device() driver structure. It's same as LP8557, so the device configuration code is shared with LP8557. Backlight outputs are generated from dual DC-DC boost converters. It's configurable EPROM settings which are defined in the platform data. Driver documentation and device tree bindings are updated. Signed-off-by: Milo Kim <milo.kim@ti.com> Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13MAINTAINERS: update Zwane Mwaikambo's e-mail addressJean Delvare3-3/+3
Zwane Mwaikambo's @arm.linux.org.uk address no longer works. In February 2013 he asked for his gmail address to be used instead [1] so let's just do that. [1] http://marc.info/?l=linux-kernel&m=136079068903214&w=2 Signed-off-by: Jean Delvare <jdelvare@suse.de> Cc: Russell King <rmk+kernel@arm.linux.org.uk> Cc: Zwane Mwaikambo <zwanem@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13MAINTAINERS: remove Richard Purdie as backlight maintainerJingoo Han2-1/+5
Remove Richard Purdie as backlight subsystem maintainer, akpm: Richard is still responsive and is reviewing some of the patches, but appears to agree that listing him as the maintainer is no longer appropriate. [akpm@linux-foundation.org: s/USA/UK/] Signed-off-by: Jingoo Han <jg1.han@samsung.com> Acked-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13printk.c: comments should refer to /proc/vmcore instead of /proc/vmcoreinfoDirk Gouders1-2/+2
In one of those comments a typo was fixed, too. Signed-off-by: Dirk Gouders <dirk@gouders.net> Cc: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13kernel/printk/printk.c: enable boot delay for earlyprintkDave Young1-2/+2
boot_delay does not work for earlyprintk because the kernel cmdline parsing is late. Change to use early_param so early kernel messages can also be delayed. Signed-off-by: Dave Young <dyoung@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13vsprintf: check real user/group id for %pKRyan Mallon2-10/+48
Some setuid binaries will allow reading of files which have read permission by the real user id. This is problematic with files which use %pK because the file access permission is checked at open() time, but the kptr_restrict setting is checked at read() time. If a setuid binary opens a %pK file as an unprivileged user, and then elevates permissions before reading the file, then kernel pointer values may be leaked. This happens for example with the setuid pppd application on Ubuntu 12.04: $ head -1 /proc/kallsyms 00000000 T startup_32 $ pppd file /proc/kallsyms pppd: In file /proc/kallsyms: unrecognized option 'c1000000' This will only leak the pointer value from the first line, but other setuid binaries may leak more information. Fix this by adding a check that in addition to the current process having CAP_SYSLOG, that effective user and group ids are equal to the real ids. If a setuid binary reads the contents of a file which uses %pK then the pointer values will be printed as NULL if the real user is unprivileged. Update the sysctl documentation to reflect the changes, and also correct the documentation to state the kptr_restrict=0 is the default. This is a only temporary solution to the issue. The correct solution is to do the permission check at open() time on files, and to replace %pK with a function which checks the open() time permission. %pK uses in printk should be removed since no sane permission check can be done, and instead protected by using dmesg_restrict. Signed-off-by: Ryan Mallon <rmallon@gmail.com> Cc: Kees Cook <keescook@chromium.org> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Joe Perches <joe@perches.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13kernel/printk/printk.c: convert to pr_foo()Andrew Morton1-6/+6
It was half-and-half. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Joe Perches <joe@perches.com> Cc: Kees Cook <keescook@chromium.org> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13printk: report console names during cut-overKees Cook1-10/+9
This reports the names of consoles as they're being disabled to help identify which is which during cut-over. Helps answer the question "which boot console actually got activated?" once the regular console is running, mostly when debugging boot console failures. Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Joe Perches <joe@perches.com> Cc: Tejun Heo <tj@kernel.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13init/main.c: remove prototype for softirq_init()Geert Uytterhoeven1-1/+0
It's already available in <linux/interrupt.h> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13sched: remove ARCH specific fpu_counter from task_structVineet Gupta1-9/+0
fpu_counter in task_struct was used only by sh/x86. Both of these now carry it in ARCH specific thread_struct, hence this can now be removed from generic task_struct, shrinking it slightly for other arches. Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Paul Mundt <paul.mundt@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13x86: move fpu_counter into ARCH specific thread_structVineet Gupta6-10/+19
Only a couple of arches (sh/x86) use fpu_counter in task_struct so it can be moved out into ARCH specific thread_struct, reducing the size of task_struct for other arches. Compile tested i386_defconfig + gcc 4.7.3 Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Acked-by: Ingo Molnar <mingo@kernel.org> Cc: Paul Mundt <paul.mundt@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13sh: move fpu_counter into ARCH specific thread_structVineet Gupta5-5/+25
Only a couple of arches (sh/x86) use fpu_counter in task_struct so it can be moved out into ARCH specific thread_struct, reducing the size of task_struct for other arches. Compile tested sh defconfig + sh4-linux-gcc (4.6.3) Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Paul Mundt <paul.mundt@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13jump_label: unlikely(x) > 0Roel Kluin1-2/+2
if (unlikely(x) > 0) doesn't seem to help branch prediction Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: "H. Peter Anvin" <hpa@linux.intel.com> Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13kernel/sys.c: remove obsolete #include <linux/kexec.h>Geert Uytterhoeven1-1/+0
Commit 15d94b82565e ("reboot: move shutdown/reboot related functions to kernel/reboot.c") moved all kexec-related functionality to kernel/reboot.c, so kernel/sys.c no longer needs to include <linux/kexec.h>. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Robin Holt <holt@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13kernel/delayacct.c: remove redundant checking in __delayacct_add_tsk()Chen Gang1-7/+0
The wrapper function delayacct_add_tsk() already checked 'tsk->delays', and __delayacct_add_tsk() has no another direct callers, so can remove the redundancy checking code. And the label 'done' is also useless, so remove it, too. Signed-off-by: Chen Gang <gang.chen@asianux.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13gen_init_cpio: avoid NULL pointer dereference and rework env expandingMichal Nazarewicz1-18/+9
getenv() may return NULL if given environment variable does not exist which leads to NULL dereference when calling strncat. Besides that, the environment variable name was copied to a temporary env_var buffer, but this copying can be avoided by simply using the input string. Lastly, the whole loop can be greatly simplified by using the snprintf function instead of the playing with strncat. By the way, the current implementation allows a recursive variable expansion, as in: $ echo 'out ${A} out ' | A='a ${B} a' B=b /tmp/a out a b a out I'm assuming this is just a side effect and not a conscious decision (especially as this may lead to infinite loop), but I didn't want to change this behaviour without consulting. If the current behaviour is deamed incorrect, I'll be happy to send a patch without recursive processing. Signed-off-by: Michal Nazarewicz <mina86@mina86.com> Cc: Kees Cook <keescook@chromium.org> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Jesper Juhl <jj@codesealer.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13errno.h: remove "NFS" from descriptions in commentsEric Sandeen6-6/+6
glibc recently changed the error string for ESTALE to remove "NFS" - https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=96945714ec61951cc748da2b4b8a80cf02127ee9 from: [ERR_REMAP (ESTALE)] = N_("Stale NFS file handle"), to: [ERR_REMAP (ESTALE)] = N_("Stale file handle"), And some have expressed concern that the kernel's errno.h comments still refer to NFS. So make that change... note that this is a comment-only change, and has no functional difference. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13init/do_mounts.c: add maj:min syntax commentSebastian Capella1-0/+2
The name_to_dev_t function has a comment block which lists the supported syntaxes for the device name. Add a bullet for the <major>:<minor> syntax, which is already supported in the code Signed-off-by: Sebastian Capella <sebastian.capella@linaro.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13scripts/mod/modpost.c: handle non ABS crc symbolsAndi Kleen1-8/+7
For some reason I managed to trick gcc into create CRC symbols that are not absolute anymore, but weak. Make modpost handle this case. Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13syscalls.h: use gcc alias instead of assembler aliases for syscallsAndi Kleen2-4/+4
Use standard gcc __attribute__((alias(foo))) to define the syscall aliases instead of custom assembler macros. This is far cleaner, and also fixes my LTO kernel build. Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13cramfs: mark as obsoleteMichael Opdenacker2-2/+5
Who needs cramfs when you have squashfs? At least, we should warn people that cramfs is obsolete. Signed-off-by: Michael Opdenacker <michael.opdenacker@free-electrons.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13percpu: add test module for various percpu operationsGreg Thelen3-0/+149
Tests various percpu operations. Enable with CONFIG_PERCPU_TEST=m. Signed-off-by: Greg Thelen <gthelen@google.com> Acked-by: Tejun Heo <tj@kernel.org> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13drivers/char/hpet.c: allow user controlled mmap for user processesPrarit Bhargava3-4/+33
The CONFIG_HPET_MMAP Kconfig option exposes the memory map of the HPET registers to userspace. The Kconfig help points out that in some cases this can be a security risk as some systems may erroneously configure the map such that additional data is exposed to userspace. This is a problem for distributions -- some users want the MMAP functionality but it comes with a significant security risk. In an effort to mitigate this risk, and due to the low number of users of the MMAP functionality, I've introduced a kernel parameter, hpet_mmap_enable, that is required in order to actually have the HPET MMAP exposed. Signed-off-by: Prarit Bhargava <prarit@redhat.com> Acked-by: Matt Wilson <msw@amazon.com> Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13mm: numa: return the number of base pages altered by protection changesMel Gorman3-3/+9
Commit 0255d4918480 ("mm: Account for a THP NUMA hinting update as one PTE update") was added to account for the number of PTE updates when marking pages prot_numa. task_numa_work was using the old return value to track how much address space had been updated. Altering the return value causes the scanner to do more work than it is configured or documented to in a single unit of work. This patch reverts that commit and accounts for the number of THP updates separately in vmstat. It is up to the administrator to interpret the pair of values correctly. This is a straight-forward operation and likely to only be of interest when actively debugging NUMA balancing problems. The impact of this patch is that the NUMA PTE scanner will scan slower when THP is enabled and workloads may converge slower as a result. On the flip size system CPU usage should be lower than recent tests reported. This is an illustrative example of a short single JVM specjbb test specjbb 3.12.0 3.12.0 vanilla acctupdates TPut 1 26143.00 ( 0.00%) 25747.00 ( -1.51%) TPut 7 185257.00 ( 0.00%) 183202.00 ( -1.11%) TPut 13 329760.00 ( 0.00%) 346577.00 ( 5.10%) TPut 19 442502.00 ( 0.00%) 460146.00 ( 3.99%) TPut 25 540634.00 ( 0.00%) 549053.00 ( 1.56%) TPut 31 512098.00 ( 0.00%) 519611.00 ( 1.47%) TPut 37 461276.00 ( 0.00%) 474973.00 ( 2.97%) TPut 43 403089.00 ( 0.00%) 414172.00 ( 2.75%) 3.12.0 3.12.0 vanillaacctupdates User 5169.64 5184.14 System 100.45 80.02 Elapsed 252.75 251.85 Performance is similar but note the reduction in system CPU time. While this showed a performance gain, it will not be universal but at least it'll be behaving as documented. The vmstats are obviously different but here is an obvious interpretation of them from mmtests. 3.12.0 3.12.0 vanillaacctupdates NUMA page range updates 1408326 11043064 NUMA huge PMD updates 0 21040 NUMA PTE updates 1408326 291624 "NUMA page range updates" == nr_pte_updates and is the value returned to the NUMA pte scanner. NUMA huge PMD updates were the number of THP updates which in combination can be used to calculate how many ptes were updated from userspace. Signed-off-by: Mel Gorman <mgorman@suse.de> Reported-by: Alex Thorlton <athorlton@sgi.com> Reviewed-by: Rik van Riel <riel@redhat.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13mm: factor commit limit calculationJerome Marchand5-9/+18
The same calculation is currently done in three differents places. Factor that code so future changes has to be made at only one place. [akpm@linux-foundation.org: uninline vm_commit_limit()] Signed-off-by: Jerome Marchand <jmarchan@redhat.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-13mm: improve the description for dirty_background_ratio/dirty_ratio sysctlZheng Liu1-5/+10
Now dirty_background_ratio/dirty_ratio contains a percentage of total avaiable memory, which contains free pages and reclaimable pages. The number of these pages is not equal to the number of total system memory. But they are described as a percentage of total system memory in Documentation/sysctl/vm.txt. So we need to fix them to avoid misunderstanding. Signed-off-by: Zheng Liu <wenqing.lz@taobao.com> Cc: Rob Landley <rob@landley.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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