From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Fri, 24 Mar 2006 11:15:50 +0000 (-0800)
Subject: [PATCH] rcu_process_callbacks: don't cli() while testing ->nxtlist
X-Git-Tag: v2.6.17-rc1~941
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=caa9ee771de3195ae85ac6f8cb550f53e9ecdd82;p=pandora-kernel.git

[PATCH] rcu_process_callbacks: don't cli() while testing ->nxtlist

__rcu_process_callbacks() disables interrupts to protect itself from
call_rcu() which adds new entries to ->nxtlist.

However we can check "->nxtlist != NULL" with interrupts enabled, we can't
get "false positives" because call_rcu() can only change this condition
from 0 to 1.

Tested with rcutorture.ko.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Dipankar Sarma <dipankar@in.ibm.com>
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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