linux-kernel - Re: [PATCH 2/5] x86: ia32_signal: introduce COPY_SEG

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Date:	Sat, 15 Nov 2008 17:11:49 +0000
From:	"Américo Wang" <xiyou.wangcong@...il.com>
To:	"Hiroshi Shimamoto" <h-shimamoto@...jp.nec.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] x86: ia32_signal: introduce COPY_SEG_STRICT

On Sat, Nov 15, 2008 at 3:26 AM, Hiroshi Shimamoto
<h-shimamoto@...jp.nec.com> wrote:
> From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
>
> Impact: cleanup
>
> Introduce COPY_SEG_STRICT for ia32_restore_sigcontext().
>
> Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
> ---
>  arch/x86/ia32/ia32_signal.c |   12 ++++++++----
>  1 files changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
> index a28790a..f74178e 100644
> --- a/arch/x86/ia32/ia32_signal.c
> +++ b/arch/x86/ia32/ia32_signal.c
> @@ -201,6 +201,12 @@ struct rt_sigframe
>        err |= __get_user(regs->x, &sc->x);     \
>  }
>
> +#define COPY_SEG_STRICT(seg)   {                       \
> +               unsigned short tmp;                     \
> +               err |= __get_user(tmp, &sc->seg);       \
> +               regs->seg = tmp | 3;                    \
> +}
> +

Since your first patch is to kill the temporary variables, then why do you
introduce a temporary variable here? It can be avoided like it was.

Can you explain the reason? :)
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