From: Jonathan Corbet <corbet@lwn.net>
Date: Wed, 8 Sep 2010 22:54:54 +0000 (-0600)
Subject: lglock: make lg_lock_global() actually lock globally
X-Git-Tag: v2.6.36-rc4~65
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a73f8844e1fc54c3762555c1cf1f71774142ca91;p=pandora-kernel.git

lglock: make lg_lock_global() actually lock globally

lg_lock_global() currently only acquires spinlocks for online CPUs, but
it's meant to lock all possible CPUs.  Lglock-protected resources may be
associated with removed CPUs - and, indeed, that could happen with the
per-superblock open files lists.

At Nick's suggestion, change for_each_online_cpu() to
for_each_possible_cpu() to protect accesses to those resources.

Cc: Al Viro <viro@ZenIV.linux.org.uk>
Acked-by: Nick Piggin <npiggin@kernel.dk>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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