[U-Boot] [PATCH v2 12/20] x86: Add an mfence macro

[Bin Meng]

On Wed, Apr 29, 2015 at 10:25 AM, Simon Glass <sjg at chromium.org> wrote:
> Provide access to this x86 instruction from C code.
>
> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---
>
> Changes in v2:
> - Remove unnecessary \t\n after mfence assembler instruction
>
>  arch/x86/include/asm/cpu.h | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h
> index c839291..08284ee 100644
> --- a/arch/x86/include/asm/cpu.h
> +++ b/arch/x86/include/asm/cpu.h
> @@ -151,6 +151,11 @@ static inline int flag_is_changeable_p(uint32_t flag)
>         return ((f1^f2) & flag) != 0;
>  }
>
> +static inline void mfence(void)
> +{
> +       __asm__ __volatile__("mfence" : : : "memory");
> +}
> +
>  /**
>   * cpu_enable_paging_pae() - Enable PAE-paging
>   *
> --

Reviewed-by: Bin Meng <bmeng.cn at gmail.com>