linux-kernel - Re: [RFC PATCH v2 -tip 0/4] x86: signal handler improvement

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Message-ID: <48DBD8A6.8060900@ct.jp.nec.com>
Date:	Thu, 25 Sep 2008 11:29:58 -0700
From:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 -tip 0/4] x86: signal handler improvement

H. Peter Anvin wrote:
> Hiroshi Shimamoto wrote:
>> and errors in __put_user is stored to stack.
>> At the end of function, all errors in stack are calculated. If access to user
>> space is failed, %edx is set to -EFAULT in exception handler and stored to
>> stack for later operation.
>> It seems inefficient.
>>
> 
> This is a gcc failure, and should be reported to the gcc people.

Does this gcc failure mean unnecessary storing into stack?

thanks,
Hiroshi Shimamoto

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