arm: use clear_tasks_mm_cpumask()
authorAnton Vorontsov <anton.vorontsov@linaro.org>
Thu, 31 May 2012 23:26:22 +0000 (16:26 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 1 Jun 2012 00:49:29 +0000 (17:49 -0700)
commit3eaa73bde2fb475b731a0fde7dd11c3ecfb8679c
tree23c087b9be927d334c3eb3b08f746a8675dae3b9
parentcb79295e20a8088a2fd6a9b3cb5f2d889ec36b4d
arm: use clear_tasks_mm_cpumask()

Checking for process->mm is not enough because process' main thread may
exit or detach its mm via use_mm(), but other threads may still have a
valid mm.

To fix this we would need to use find_lock_task_mm(), which would walk up
all threads and returns an appropriate task (with task lock held).

clear_tasks_mm_cpumask() has this issue fixed, so let's use it.

Suggested-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/arm/kernel/smp.c