kernel_optimize_test/arch/um
Anton Vorontsov 137d1a26c8 um: fix possible race on task->mm
Checking for task->mm is dangerous as ->mm might disappear (exit_mm()
assigns NULL under task_lock(), so tasklist lock is not enough).

We can't use get_task_mm()/mmput() pair as mmput() might sleep, so let's
take the task lock while we care about its mm.

Note that we should also use find_lock_task_mm() to check all process'
threads for a valid mm, but for uml we'll do it in a separate patch.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-05-31 17:49:30 -07:00
..
drivers Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml 2012-05-23 09:01:41 -07:00
include Merge branch 'next' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2012-05-24 16:17:30 -07:00
kernel um: fix possible race on task->mm 2012-05-31 17:49:30 -07:00
os-Linux um: Remove unused variables 2012-05-21 21:09:32 +02:00
scripts um: don't bother trying to rebuild CHECKFLAGS for USER_OBJS 2012-03-25 00:29:56 +01:00
sys-ia64 uml: remove useless comments 2009-04-01 08:59:17 -07:00
sys-ppc um: change to new flag variables 2011-03-17 14:02:57 +01:00
.gitignore um: tell git to ignore generated files 2010-03-06 11:26:28 -08:00
defconfig um: Remove CONFIG_IRQ_RELEASE_METHOD 2012-05-21 21:09:37 +02:00
Kconfig.char um: clean Kconfig up a bit 2011-11-02 14:15:29 +01:00
Kconfig.common Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-05-24 13:29:46 -07:00
Kconfig.debug lib: consolidate DEBUG_STACK_USAGE option 2011-05-25 08:39:54 -07:00
Kconfig.net Fix common misspellings 2011-03-31 11:26:23 -03:00
Kconfig.rest um: switch to use of drivers/Kconfig 2011-11-02 14:15:41 +01:00
Kconfig.um timers: Fixup the Kconfig consolidation fallout 2012-05-21 23:43:46 +02:00
Makefile kbuild: link of vmlinux moved to a script 2012-05-05 21:19:33 +02:00
Makefile-ia64
Makefile-os-Linux
Makefile-ppc
Makefile-skas