linux-kernel - Re: uml and -regparm=3

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Message-ID: <20080110023701.GB20813@one.firstfloor.org>
Date:	Thu, 10 Jan 2008 03:37:01 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Jeff Dike <jdike@...toit.com>
Cc:	Miklos Szeredi <miklos@...redi.hu>, andi@...stfloor.org,
	harvey.harrison@...il.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: Re: uml and -regparm=3

On Wed, Jan 09, 2008 at 09:14:04PM -0500, Jeff Dike wrote:
> On Wed, Jan 09, 2008 at 10:50:48PM +0100, Miklos Szeredi wrote:
> > > FASTCALL is useless and should not make a difference. It enables
> > > regparm on specific functions, but that should not make a difference
> > > if it works or not.
> > 
> > __down_write() in include/asm-x86/rwsem.h seems to assume, that the
> > semaphore pointer is passed in %eax down to rwsem_down_write_failed(),
> > so regparm does make a difference there.
> 
> And rwsem_down_write_failed seems to think it's getting the pointer in
> %eax:

That's a left over from when it was called by magic inline assembly.
I suspect it would be better to switch it just over to stack args
for consistent and then declare it asmlinkage

-Andi
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