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

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To: Linus Torvalds <[email protected]>
Subject: Re: Why set ORIG_EAX(%esp) to -1 in arch/i386/kernel/entry.S:error_code?
From: Jeremy Fitzhardinge <[email protected]>
Date: Tue, 29 Aug 2006 15:29:58 -0700
Cc: Linux Kernel Mailing List <[email protected]>, Andi Kleen <[email protected]>, Zachary Amsden <[email protected]>, Chuck Ebbert <[email protected]>
In-reply-to: <[email protected]>
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Linus Torvalds wrote:

No. It's important that ORIG_EAX be set to some value that is _not_ avalid system call number, so that the system call restart logic (see thesignal 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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References:
- Why set ORIG_EAX(%esp) to -1 in arch/i386/kernel/entry.S:error_code?
  - From: Jeremy Fitzhardinge <[email protected]>
- Re: Why set ORIG_EAX(%esp) to -1 in arch/i386/kernel/entry.S:error_code?
  - From: Linus Torvalds <[email protected]>

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