linux-kernel - Re: [RFC PATCH -tip 0/4] x86: signal handler improvement

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Message-ID: <48D920C8.2060600@ct.jp.nec.com>
Date:	Tue, 23 Sep 2008 10:00:56 -0700
From:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH -tip 0/4] x86: signal handler improvement

Ingo Molnar wrote:
> * Ingo Molnar <mingo@...e.hu> wrote:
> 
>> could we perhaps first finish unifying them into signal.c, and then 
>> introduce __put_user_cerr() in signal_32/64.c?
> 
> i've got an API suggestion as well. Instead of:
> 
> -               err |= __put_user(UC_FP_XSTATE, &frame->uc.uc_flags);
> +               __put_user_cerr(UC_FP_XSTATE, &frame->uc.uc_flags, err);
> 
> could you instead please make it:
> 
> +               __put_user_cerr(UC_FP_XSTATE, &frame->uc.uc_flags, &err);
> 
> i.e. pass in 'err' as a reference. This makes it clear to the casual 
> reader, in a C calling convention sense, that there's a side-effect to 
> 'err'. [ There should be no change to the resulting code as 
> __put_user_cerr() is a macro. ]

make sense!
Will do in next post.

thanks,
Hiroshi Shimamoto


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