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Date: Tue, 17 Dec 2002 20:39:13 -0800
From: "H. Peter Anvin" <hpa@transmeta.com>
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To: Linus Torvalds <torvalds@transmeta.com>
CC: Ulrich Drepper <drepper@redhat.com>,
       Matti Aarnio <matti.aarnio@zmailer.org>,
       Hugh Dickins <hugh@veritas.com>, Dave Jones <davej@codemonkey.org.uk>,
       Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org
Subject: Re: Intel P6 vs P7 system call performance
References: <Pine.LNX.4.44.0212171716020.1362-100000@home.transmeta.com>
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Linus Torvalds wrote:
> On Tue, 17 Dec 2002, Linus Torvalds wrote:
> 
>>How about this diff? It does both the 6-parameter thing _and_ the
>>AT_SYSINFO addition.
> 
> 
> The 6-parameter thing is broken. It's clever, but playing games with %ebp
> is not going to work with restarting of the system call - we need to
> restart with the proper %ebp.
> 

This confuses me -- there seems to be no reason this shouldn't work as 
long as %esp == %ebp on sysexit.  The SYSEXIT-trashed GPRs seem like a 
bigger problem.

	-hpa


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