linux-kernel - Re: kernel 2.6.39 (user mode linux) crashes (2.6.38 works fine)

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Date:	Sun, 22 May 2011 00:37:36 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	richard -rw- weinberger <richard.weinberger@...il.com>
Cc:	Toralf Förster <toralf.foerster@....de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Darren Hart <dvhart@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	user-mode-linux-devel@...ts.sourceforge.net,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: kernel 2.6.39 (user mode linux) crashes (2.6.38 works fine)

On Sat, 2011-05-21 at 12:12 +0200, richard -rw- weinberger wrote:
> 2011/5/21 Toralf Förster <toralf.foerster@....de>:
> > Bisecting gave :
> >
> >
> > git bisect badd123375425d7df4b6081a631fc1203fceafa59b2 is the first bad commit
> > commit d123375425d7df4b6081a631fc1203fceafa59b2
> > Author: Thomas Gleixner <tglx@...utronix.de>
> > Date:   Wed Jan 26 21:32:01 2011 +0100
> >
> >    rwsem: Remove redundant asmregparm annotation
> >
> >    Peter Zijlstra pointed out, that the only user of asmregparm (x86) is
> >    compiling the kernel already with -mregparm=3. So the annotation of
> >    the rwsem functions is redundant. Remove it.
> 
> Ok, this bisect makes much more sense.
> 
> Thomas, Peter, please revert d123375425d7df4b6081a631fc1203fceafa59b2.
> We cannot compile UML with -mregparm=3 it would cause a lot of trouble.
> It would break 32bit UML on 64bit and also on older 32bit systems like RHEL5.

But why? 

Also, having to carry that asmregparm notation just for uml doesn't seem
worth the trouble.
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