linux-kernel - Re: [PATCH 1/5] x86/jump-label: Use best default nops for inital jump label calls

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Message-ID: <4F230899.3020808@zytor.com>
Date:	Fri, 27 Jan 2012 12:27:05 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jason Baron <jbaron@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: [PATCH 1/5] x86/jump-label: Use best default nops for inital
 jump label calls

On 01/27/2012 12:14 PM, Steven Rostedt wrote:
> 
> #define JUMP_LABEL_NOP_SIZE 5
> 
> -#define JUMP_LABEL_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t" 
> +#ifdef CONFIG_X86_64 +# define JUMP_LABEL_INIT_NOP P6_NOP5 +#else 
> +# define JUMP_LABEL_INIT_NOP 0x3e, 0x8d, 0x74, 0x26, 0x00 +#endif
> 

Why not just use ASM_NOP5_ATOMIC since you have configuration
available here?

	-hpa

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