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From: "H. Peter Anvin" <hpa@zytor.com>
To: Andy Lutomirski <luto@amacapital.net>, Andi Kleen <andi@firstfloor.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>,
	x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] x86_64,signal: Remove 'fs' and 'gs' from sigcontext
Date: Fri, 11 Jul 2014 19:04:44 -0700	[thread overview]
Message-ID: <53C097BC.7070909@zytor.com> (raw)
In-Reply-To: <a13ebdd57378120348f40cbe12d9b1705d189434.1405095200.git.luto@amacapital.net>

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


  parent reply	other threads:[~2014-07-12  2:05 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-07-11 16:29 [PATCH 0/2] x86_64,signal: Fix the set of saved segment registers Andy Lutomirski
2014-07-11 16:29 ` [PATCH 1/2] x86_64,signal: Save and restore SS in signal frames Andy Lutomirski
2015-03-09 20:15   ` Andy Lutomirski
2014-07-11 16:29 ` [PATCH 2/2] x86_64,signal: Remove 'fs' and 'gs' from sigcontext Andy Lutomirski
2014-07-11 18:12   ` Andi Kleen
2014-07-11 18:39     ` Andy Lutomirski
2014-07-12  2:09       ` H. Peter Anvin
2014-07-12  2:04   ` H. Peter Anvin [this message]
2014-07-12  2:21   ` Linus Torvalds
2014-07-12  2:26     ` H. Peter Anvin
2014-07-12  8:39     ` Andy Lutomirski
2014-07-12 18:37       ` Andi Kleen
2014-07-12 18:40         ` H. Peter Anvin
2014-07-12 18:52           ` Andi Kleen
2014-07-12 21:17             ` Andy Lutomirski
2014-07-18  1:13               ` Andy Lutomirski

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