Re: [PATCH] x86/mmiotrace: remove redundant instruction prefixchecks

From: Pekka Paalanen
Date: Sat May 22 2010 - 03:59:42 EST


On Tue, 18 May 2010 08:48:30 +0900
Akinobu Mita <akinobu.mita@xxxxxxxxx> wrote:

> Get rid of the duplicated entries in prefix_codes[] to eliminate
> redundant checks by skip_prefix().
>
> Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
> Cc: x86@xxxxxxxxxx

Acked-by: Pekka Paalanen <pq@xxxxxx>

> ---
> arch/x86/mm/pf_in.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/arch/x86/mm/pf_in.c b/arch/x86/mm/pf_in.c
> index df3d5c8..308e325 100644
> --- a/arch/x86/mm/pf_in.c
> +++ b/arch/x86/mm/pf_in.c
> @@ -34,7 +34,7 @@
> /* IA32 Manual 3, 2-1 */
> static unsigned char prefix_codes[] = {
> 0xF0, 0xF2, 0xF3, 0x2E, 0x36, 0x3E, 0x26, 0x64,
> - 0x65, 0x2E, 0x3E, 0x66, 0x67
> + 0x65, 0x66, 0x67
> };
> /* IA32 Manual 3, 3-432*/
> static unsigned int reg_rop[] = {
> --
> 1.6.0.6
>
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Pekka Paalanen
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