linux-kernel - Re: [PATCH 5/5] x86: ia32_signal: change order of storing in setup

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Date:	Sat, 15 Nov 2008 17:25:49 +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 5/5] x86: ia32_signal: change order of storing in setup_sigcontext()

On Sat, Nov 15, 2008 at 3:28 AM, Hiroshi Shimamoto
<h-shimamoto@...jp.nec.com> wrote:
> From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
>
> Impact: cleanup
>
> Change order of storing to match the sigcontext_ia32.


Well, more than reordering... Please see below.

>
> Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
> ---
>  arch/x86/ia32/ia32_signal.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
> index 2883f41..909181a 100644
> --- a/arch/x86/ia32/ia32_signal.c
> +++ b/arch/x86/ia32/ia32_signal.c
> @@ -360,13 +360,13 @@ static int ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc,
>        err |= __put_user(regs->dx, &sc->dx);
>        err |= __put_user(regs->cx, &sc->cx);
>        err |= __put_user(regs->ax, &sc->ax);
> -       err |= __put_user(regs->cs, &sc->cs);
> -       err |= __put_user(regs->ss, &sc->ss);
>        err |= __put_user(current->thread.trap_no, &sc->trapno);
>        err |= __put_user(current->thread.error_code, &sc->err);
>        err |= __put_user(regs->ip, &sc->ip);
> +       err |= __put_user(regs->cs, (unsigned int __user *)&sc->cs);
>        err |= __put_user(regs->flags, &sc->flags);
>        err |= __put_user(regs->sp, &sc->sp_at_signal);
> +       err |= __put_user(regs->ss, (unsigned int __user *)&sc->ss);


Why do you add two casts? If these two are necessary, I am afraid the rest ones
also need. :)
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