linux-kernel - Re: [PATCH 2/2] x86_64,signal: Remove 'fs' and 'gs' from sigcontext

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Date:	Fri, 11 Jul 2014 19:04:44 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@...capital.net>,
	Andi Kleen <andi@...stfloor.org>
CC:	Al Viro <viro@...IV.linux.org.uk>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] x86_64,signal: Remove 'fs' and 'gs' from sigcontext

On 07/11/2014 09:29 AM, Andy Lutomirski wrote:
> diff --git a/arch/x86/include/uapi/asm/sigcontext.h b/arch/x86/include/uapi/asm/sigcontext.h
> index 076b11f..df9908b 100644
> --- a/arch/x86/include/uapi/asm/sigcontext.h
> +++ b/arch/x86/include/uapi/asm/sigcontext.h
> @@ -177,8 +177,8 @@ struct sigcontext {
>  	__u64 rip;
>  	__u64 eflags;		/* RFLAGS */
>  	__u16 cs;
> -	__u16 gs;
> -	__u16 fs;
> +	__u16 __pad2;		/* Was called gs, but was always zero. */
> +	__u16 __pad1;		/* Was called fs, but was always zero. */
>  	__u16 ss;
>  	__u64 err;
>  	__u64 trapno;

I'm just wondering if this is likely to cause compile error in existing
code.  I guess worst case we can just revert this patch...

	-hpa

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