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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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