linux-kernel - ARM: why smp_mb() is not needed in the "__mutex_fastpath_lock" and "__mutex_fastpath

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Message-ID: <CAK2TD5ygowdy9t1TpfxAPbpvNQfMnMB-3Zp8TKMsTYtBZdGW=Q@mail.gmail.com>
Date:	Thu, 12 Jul 2012 10:14:35 +0800
From:	shan kang <kangshan0910@...il.com>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: ARM: why smp_mb() is not needed in the "__mutex_fastpath_lock" and
 "__mutex_fastpath_unlock" functions

Hello,
   I wonder why smp_mb() is not needed in the "__mutex_fastpath_lock"
and "__mutex_fastpath_unlock" functions which are located in the
"arch/arm/include/asm/mutex.h"?
   I think "dmb" instruction is necessary there.
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