linux-kernel - Re: [PATCH] [2/58] x86_64: Tell gcc to only align stack to 8 bytes

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Message-ID: <469F7838.9000201@redhat.com>
Date:	Thu, 19 Jul 2007 10:42:00 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Andi Kleen <ak@...e.de>
CC:	patches@...-64.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [2/58] x86_64: Tell gcc to only align stack to 8 bytes

On 07/19/2007 05:54 AM, Andi Kleen wrote:
> Don't need 16 byte alignment because kernel doesn't use SSE2
> 
> Signed-off-by: Andi Kleen <ak@...e.de>
> 
> ---
>  arch/x86_64/Makefile |    1 +
>  1 file changed, 1 insertion(+)
> 
> Index: linux/arch/x86_64/Makefile
> ===================================================================
> --- linux.orig/arch/x86_64/Makefile
> +++ linux/arch/x86_64/Makefile
> @@ -55,6 +55,7 @@ cflags-y += $(call cc-option,-mno-sse -m
>  # this works around some issues with generating unwind tables in older gccs
>  # newer gccs do it by default
>  cflags-y += -maccumulate-outgoing-args
> +cflags-y += -mpreferred-stack-boundary=4

Should be:

+cflags-y += -mpreferred-stack-boundary=3

>  
>  # do binutils support CFI?
>  cflags-y += $(call as-instr,.cfi_startproc\n.cfi_endproc,-DCONFIG_AS_CFI=1,)
-
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