linux-kernel - Re: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic

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Message-ID: <20090522183622.GA8385@elte.hu>
Date:	Fri, 22 May 2009 20:36:22 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Michael S. Zick" <lkml@...ethan.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic


* Michael S. Zick <lkml@...ethan.org> wrote:

> Found in the bit-rot for 32-bit, x86, Uni-processor builds:
> 
> diff --git a/arch/x86/include/asm/alternative.h b/arch/x86/include/asm/alternative.h
> index f6aa18e..3c790ef 100644
> --- a/arch/x86/include/asm/alternative.h
> +++ b/arch/x86/include/asm/alternative.h
> @@ -35,7 +35,7 @@
>                 "661:\n\tlock; "
> 
>  #else /* ! CONFIG_SMP */
> -#define LOCK_PREFIX ""
> +#define LOCK_PREFIX "\n\tlock; "
>  #endif

What is your motivation for this change? At first sight this makes 
the UP kernel a bit larger and a bit smaller. Are you fixing some 
real regression/bug here?

	Ingo
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