From: catalin.marinas@arm.com (Catalin Marinas)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: MM: bugfix: initialize spinlock for init_mm.context
Date: Fri, 17 Sep 2010 09:45:26 +0100 [thread overview]
Message-ID: <1284713126.19837.0.camel@e102109-lin.cambridge.arm.com> (raw)
In-Reply-To: <1284699282-22849-1-git-send-email-myungjoo.ham@samsung.com>
On Fri, 2010-09-17 at 13:54 +0900, MyungJoo Ham wrote:
> 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>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
prev parent reply other threads:[~2010-09-17 8:45 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-17 4:54 [PATCH] ARM: MM: bugfix: initialize spinlock for init_mm.context MyungJoo Ham
2010-09-17 8:45 ` Catalin Marinas [this message]
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