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

[Li Haifeng]

Hi Shan,

2012/7/12 shan kang <kangshan0910 at gmail.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?

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