linux-kernel - Re: 2.6.22-rc3-mm1: Xen compile error with X86

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Message-ID: <20070628233659.GE6087@stusta.de>
Date:	Fri, 29 Jun 2007 01:36:59 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	linux-kernel@...r.kernel.org, Ian Pratt <ian.pratt@...source.com>,
	Christian Limpach <Christian.Limpach@...cam.ac.uk>,
	Chris Wright <chrisw@...s-sol.org>, Andi Kleen <ak@...e.de>
Subject: Re: 2.6.22-rc3-mm1: Xen compile error with X86_CMPXCHG=n

On Sat, Jun 02, 2007 at 03:57:12PM +0200, Adrian Bunk wrote:
> I'm getting the following compile error in 2.6.22-rc3-mm1 with 
> CONFIG_X86_CMPXCHG=n (with -Werror-implicit-function-declaration - 
> otherwise it would be a link error):
> 
> <--  snip  -->
> 
> ...
>   CC      drivers/xen/grant-table.o
> /home/bunk/linux/kernel-2.6/linux-2.6.22-rc3-mm1/drivers/xen/grant-table.c: In function ‘gnttab_end_foreign_access_ref’:
> /home/bunk/linux/kernel-2.6/linux-2.6.22-rc3-mm1/drivers/xen/grant-table.c:203: error: implicit declaration of function ‘sync_cmpxchg’
> make[3]: *** [drivers/xen/grant-table.o] Error 1
> 
> <--  snip  -->
> 
> Adding a dependency of XEN on X86_CMPXCHG should not be a problem and 
> not prevent any reasonable real-life usage.
> 
> But what worries me is that a seemingly architecture independent 
> driver uses a function only available in some configurations.

Still present as of 2.6.22-rc6-mm1.

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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