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

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Message-Id: <E1JCioy-0006os-6i@pomaz-ex.szeredi.hu>
Date:	Wed, 09 Jan 2008 22:50:48 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	andi@...stfloor.org
CC:	harvey.harrison@...il.com, jdike@...toit.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: Re: uml and -regparm=3

> 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.

There's also some intervening magic in arch/x86/lib/semaphore_32.S,
that I don't quite understand, but which doesn't seem to make a
difference.

Miklos
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