tree 8aa692f337e071718e698baefc631b58b446beff
parent cba9f33d13a8ca3125b2a30abe2425ce562d8a83
author Oleg Nesterov <oleg@tv-sign.ru> 1143198950 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1143214400 -0800

[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>