linux-kernel - Re: Why set ORIG_EAX(%esp) to -1 in arch/i386/kernel/entry.S:error

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Message-ID: <44F4BFE6.9090202@goop.org>
Date:	Tue, 29 Aug 2006 15:29:58 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Linus Torvalds <torvalds@...l.org>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>, Zachary Amsden <zach@...are.com>,
	Chuck Ebbert <76306.1226@...puserve.com>
Subject: Re: Why set ORIG_EAX(%esp) to -1 in arch/i386/kernel/entry.S:error_code?

Linus Torvalds wrote:
> No. It's important that ORIG_EAX be set to some value that is _not_ a 
> valid system call number, so that the system call restart logic (see the 
> signal handling code) doesn't trigger.
>   

Ah, yes, I see.  I'll add a comment in my i386-pda patch to entry.S.

    J
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