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 12:16:07 -0400
From:	"John Stoffel" <john@...ffel.org>
To:	Andy Lutomirski <luto@...capital.net>
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@...nel.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

>>>>> "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?
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