From: Ingo Molnar <mingo@elte.hu>
Date: Thu, 7 Dec 2006 04:40:50 +0000 (-0800)
Subject: [PATCH] lockdep: register_lock_class() fix
X-Git-Tag: v2.6.20-rc1~145^2^2~35
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=70e4506765602cca047cfa31933836e354c61a63;p=pandora-kernel.git

[PATCH] lockdep: register_lock_class() fix

The hash_lock must only ever be taken with irqs disabled.  This happens in
all the important places, except one codepath: register_lock_class().  The
race should trigger rarely because register_lock_class() is quite rare and
single-threaded (happens during init most of the time).

The fix is to disable irqs.

( bug found live in -rt: there preemption is alot more agressive and
  preempting with the hash-lock held caused a lockup.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

Reading git-diff-tree failed