From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Thu, 23 Oct 2014 18:41:22 +0000 (-0700)
Subject: signal: Exit RCU read-side critical section on each pass through loop
X-Git-Tag: omap-for-v3.19/fixes-rc1~168^2^2^5~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eca1a08986f622c11b75b3b44d561a1f901c9cec;p=pandora-kernel.git

signal: Exit RCU read-side critical section on each pass through loop

The kill_pid_info() can potentially loop indefinitely if tasks are created
and deleted sufficiently quickly, and if this happens, this function
will remain in a single RCU read-side critical section indefinitely.
This commit therefore exits the RCU read-side critical section on each
pass through the loop.  Because a race must happen to retry the loop,
this should have no performance impact in the common case.

Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Pranith Kumar <bobby.prani@gmail.com>
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