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

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Date:	Fri, 11 Jul 2014 20:12:12 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Andi Kleen <andi@...stfloor.org>,
	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

> 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

I don't think renaming fields in uapi/asm is acceptable. These
are likely used by user programs and you'll break compiles.

-Andi

> @@ -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;

-- 
ak@...ux.intel.com -- Speaking for myself only.
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