linux-kernel - Re: [PATCH v2 2/2] x86_64,signal: Remove 'fs' and 'gs' from sigcontext

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Date:	Tue, 10 Mar 2015 11:12:03 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	John Stoffel <john@...ffel.org>
Cc:	Ingo Molnar <mingo@...nel.org>, Andi Kleen <andi@...stfloor.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Al Viro <viro@...iv.linux.org.uk>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v2 2/2] x86_64,signal: Remove 'fs' and 'gs' from sigcontext

On Tue, Mar 10, 2015 at 9:16 AM, John Stoffel <john@...ffel.org> wrote:
>>>>>> "Andy" == Andy Lutomirski <luto@...capital.net> writes:
>
> Andy> As far as I can tell, these fields have been set to zero on save and
> Andy> ignored on restore since Linux was imported into git.  Rename them
> Andy> '__pad1' and '__pad2' to avoid confusion and to allow them to be
> Andy> recycled some day.
>
> Andy> I'm intentionally avoiding calling either of them __pad0: the field
> Andy> formerly known as __pad0 is now ss.
>
> Andy> Signed-off-by: Andy Lutomirski <luto@...capital.net>
> Andy> ---
> Andy>  arch/x86/include/asm/sigcontext.h      | 4 ++--
> Andy>  arch/x86/include/uapi/asm/sigcontext.h | 4 ++--
> Andy>  arch/x86/kernel/signal.c               | 4 ++--
> Andy>  3 files changed, 6 insertions(+), 6 deletions(-)
>
> Andy> diff --git a/arch/x86/include/asm/sigcontext.h b/arch/x86/include/asm/sigcontext.h
> Andy> index f910cdcb71fd..5f0ef11719e1 100644
> Andy> --- a/arch/x86/include/asm/sigcontext.h
> Andy> +++ b/arch/x86/include/asm/sigcontext.h
> Andy> @@ -57,8 +57,8 @@ struct sigcontext {
> Andy>   unsigned long ip;
> Andy>   unsigned long flags;
> Andy>   unsigned short cs;
> Andy> - unsigned short gs;
> Andy> - unsigned short fs;
> Andy> + unsigned short __pad2;  /* Was called gs, but was always zero. */
> Andy> + unsigned short __pad1;  /* Was called gs, but was always zero. */
>
> Shouldn't this comment read:
>
>   /* Was called fs, but was always zero. */
>
> for the second one?

Will fix for v2.  Thanks.

-- 
Andy Lutomirski
AMA Capital Management, LLC
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