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

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Message-ID: <CAFNq8R6dNb0BrDVZScJ8s=P3B-OMgtr8tUdy8XqQcCAeUWuH+A@mail.gmail.com>
Date:	Fri, 13 Jul 2012 15:02:35 +0800
From:	Li Haifeng <omycle@...il.com>
To:	shan kang <kangshan0910@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: ARM: why smp_mb() is not needed in the "__mutex_fastpath_lock"
 and "__mutex_fastpath_unlock" functions

Hi Shan,

2012/7/12 shan kang <kangshan0910@...il.com>:
> 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.

Why necessary? Could you explain more detailed?

>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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