From: MyungJoo Ham <myungjoo.ham@gmail.com>
Date: Tue, 23 Nov 2010 10:39:23 +0000 (+0100)
Subject: ARM: 6490/1: MM: bugfix: initialize spinlock for init_mm.context
X-Git-Tag: v2.6.37-rc4~31^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=28c22d7dc99486ef4186dde41d5260e75b3076f7;p=pandora-kernel.git

ARM: 6490/1: MM: bugfix: initialize spinlock for init_mm.context

init_mm used at kernel/sched.c:idle_task_exit() has spin_lock
(init_mm.context.id_lock) that is not initialized when spin_lock/unlock
is called at an ARM machine. Note that mm_struct.context.id_lock is
usually initialized except for the instance of init_mm at
linux/arch/arm/mm/context.c

Not initializing this spinlock incurs "BUG: pinlock bad magic"
warning when spinlock debug is enabled. We have observed such
instances when testing PM in S5PC210 machines.

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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