linux-kernel - Re: [PATCH 1/2] perf tools: allow building for ARM

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Date:	Fri, 11 Dec 2009 11:23:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jamie Iles <jamie.iles@...ochip.com>
Cc:	linux-kernel@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 1/2] perf tools: allow building for ARM


* Jamie Iles <jamie.iles@...ochip.com> wrote:

> +#ifdef __arm__
> +#include "../../arch/arm/include/asm/unistd.h"
> +#define rmb()		asm volatile("":::"memory")
> +#define cpu_relax()	asm volatile("":::"memory")
> +#endif

cpu_relax() looks fine, but rmb() seems not to match the one that can be 
found in arch/arm/:

arch/arm/include/asm/system.h:#define rmb()		dmb()
arch/arm/include/asm/system.h:#define rmb()	do { if (arch_is_coherent()) dmb(); else barrier(); } while (0)
arch/arm/include/asm/system.h:#define smp_rmb()	rmb()

arch/arm/include/asm/system.h:#define dmb() __asm__ __volatile__ ("dmb" : : : "memory")
arch/arm/include/asm/system.h:#define dmb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
arch/arm/include/asm/system.h:#define dmb() __asm__ __volatile__ ("" : : : "memory")
arch/arm/include/asm/system.h:#define dmb() __asm__ __volatile__ ("" : : : "memory")

	Ingo
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