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

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Message-ID: <48DBD519.6030204@zytor.com>
Date:	Thu, 25 Sep 2008 11:14:49 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.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

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.

	-hpa
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