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

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Message-Id: <20061128164538.d95e8498.akpm@osdl.org>
Date:	Tue, 28 Nov 2006 16:45:38 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	lkml <linux-kernel@...r.kernel.org>, aia21@...tab.net
Subject: Re: [PATCH 1/2] lib + ntfs: let modules force HWEIGHT

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.
It's either part of the API or it ain't.
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