From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Thu, 15 Jun 2006 16:12:02 +0000 (+0400)
Subject: [PATCH] arm_timer: remove a racy and obsolete PF_EXITING check
X-Git-Tag: v2.6.17~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f53ae1dc3429529a58aa538e0a860d713c7079c3;p=pandora-kernel.git

[PATCH] arm_timer: remove a racy and obsolete PF_EXITING check

arm_timer() checks PF_EXITING to prevent BUG_ON(->exit_state)
in run_posix_cpu_timers().

However, for some reason it does so only for CPUCLOCK_PERTHREAD
case (which is imho wrong).

Also, this check is not reliable, PF_EXITING could be set on
another cpu without any locks/barriers just after the check,
so it can't prevent from attaching the timer to the exiting
task.

The previous patch makes this check unneeded.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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