linux-kernel - Re: sparc64: Optimized immediate value implementation build error

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Message-ID: <20081013233752.GA7866@Krystal>
Date:	Mon, 13 Oct 2008 19:37:53 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	David Miller <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: sparc64: Optimized immediate value implementation build error

* David Miller (davem@...emloft.net) wrote:
> From: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
> Date: Fri, 3 Oct 2008 16:10:07 -0400
> 
> > I ran a cross-compiler on the -lttng tree
> > git://git.kernel.org/pub/scm/linux/kernel/git/compudj/linux-2.6-lttng.git
> > 
> > to build the sparc64 arch, and ran across this build error :
> > 
> > /home/compudj/git/morestable/linux-2.6-lttng/include/trace/sched.h: In function `do_fork':
> > /home/compudj/git/morestable/linux-2.6-lttng/include/trace/sched.h:38: warning: asm operand 1 probably doesn't match constraints
> > /home/compudj/git/morestable/linux-2.6-lttng/include/trace/sched.h:38: error: impossible constraint in `asm'
> > /home/compudj/git/morestable/linux-2.6-lttng/include/trace/sched.h:38: warning: 'value' might be used uninitialized in this function
> > make[2]: *** [kernel/fork.o] Error 1
> > 
> > I think it's caused by :
> > http://git.kernel.org/?p=linux/kernel/git/compudj/linux-2.6-lttng.git;a=commit;h=c76bfa90a6eb02651368a152b3646aa672d9e625
> 
> It can't be "caused by" that commit because that's the initial
> immediate value sparc64 support I wrote and the tree very much compiled
> properly when I did test builds way back then.
> 
> I don't have time to look further into this right now, sorry.

Ok, I'll dig into this. I use gcc 3.4.5, that could be my problem; it's
broken on x86_64. I'll do some testing in this direction. Also, I see
that you have used .uaword and declared "int" in your sparc64
implementation to encode pointers. Am I missing something or should it
be "long" and either .word or .xword (32 or 64 bits) ?

Mathieu

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Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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