linux-kernel - Re: [rfc patch] i386: don't save eflags on task switch

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Message-Id: <1162748079.3160.102.camel@laptopd505.fenrus.org>
Date:	Sun, 05 Nov 2006 18:34:39 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Andi Kleen <ak@...e.de>, Zachary Amsden <zach@...are.com>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Chuck Ebbert <76306.1226@...puserve.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [rfc patch] i386: don't save eflags on task switch


> Andi, one single bug is usually worth _months_ of peoples time and effort. 
> How many CPU cycles is that? 

actually lockdep is pretty good at finding this type of bug IMMEDIATELY
even without the actual race triggering ;)

(but I otherwise agree that unless there is a
"sti-conditional-on-zero-flag" or something.... it's probably a void
optimization in the general uninlined case)

-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

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