linux-kernel - Re: [PATCH 1/2] lib + ntfs: let modules force HWEIGHT

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Message-ID: <20061202165626.GO11084@stusta.de>
Date:	Sat, 2 Dec 2006 17:56:26 +0100
From:	Adrian Bunk <bunk@...sta.de>
To:	Andrew Morton <akpm@...l.org>
Cc:	Randy Dunlap <randy.dunlap@...cle.com>,
	lkml <linux-kernel@...r.kernel.org>, aia21@...tab.net
Subject: Re: [PATCH 1/2] lib + ntfs: let modules force HWEIGHT

On Tue, Nov 28, 2006 at 04:45:38PM -0800, Andrew Morton wrote:
> On Tue, 28 Nov 2006 14:08:40 -0800
> Randy Dunlap <randy.dunlap@...cle.com> wrote:
> 
> > From: Randy Dunlap <randy.dunlap@...cle.com>
> > 
> > NTFS (=m) uses hweight32(), but that function is only linked
> > into the kernel image if it is used inside the kernel image,
> > not in loadable modules.  Let modules force HWEIGHT to be
> > built into the kernel image.  Otherwise build fails:
> > 
> >   Building modules, stage 2.
> >   MODPOST 94 modules
> > WARNING: "hweight32" [fs/ntfs/ntfs.ko] undefined!
> > 
> > Yes, I'd certainly prefer for this to be more automated rather than
> > forced by each module that needs it.
> 
> Perhaps we should just put it in lib-y and remove CONFIG_GENERIC_HWEIGHT.
>...

This will obviously not help in this case...

EXPORT_SYMBOL() in a lib-* is always a bug.

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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