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From: Andi Kleen <andi@firstfloor.org>
To: Jeff Dike <jdike@addtoit.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>,
	andi@firstfloor.org, harvey.harrison@gmail.com,
	akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
	user-mode-linux-devel@lists.sourceforge.net
Subject: Re: uml and -regparm=3
Date: Thu, 10 Jan 2008 03:37:01 +0100	[thread overview]
Message-ID: <20080110023701.GB20813@one.firstfloor.org> (raw)
In-Reply-To: <20080110021404.GA11287@c2.user-mode-linux.org>

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

  reply	other threads:[~2008-01-10  2:34 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-09 21:01 Miklos Szeredi
2008-01-09 21:12 ` Andi Kleen
2008-01-09 21:20   ` Miklos Szeredi
2008-01-09 21:32     ` Andi Kleen
2008-01-09 21:50       ` Miklos Szeredi
2008-01-10  2:14         ` Jeff Dike
2008-01-10  2:37           ` Andi Kleen [this message]
2008-01-10  2:45             ` H. Peter Anvin
2008-01-09 21:33     ` Adrian Bunk
2008-01-09 22:01 ` linux-os (Dick Johnson)
2008-01-10  7:32 ` Ingo Molnar
2008-01-10  9:05   ` Miklos Szeredi
2008-01-10  9:35     ` Ingo Molnar

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