linux-ext4 - Re: [PATCH v3 1/9] string: introduce memweight

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Message-ID: <CAC5umyj1RGHh_0miku_R+ZCtfTOBK6XeY62Aun2MifgFTn_MKg@mail.gmail.com>
Date:	Thu, 21 Jun 2012 18:07:14 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	Tony Luck <tony.luck@...il.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Anders Larsen <al@...rsen.net>,
	Alasdair Kergon <agk@...hat.com>, dm-devel@...hat.com,
	linux-fsdevel@...r.kernel.org,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-media@...r.kernel.org, Mark Fasheh <mfasheh@...e.com>,
	Joel Becker <jlbec@...lplan.org>, ocfs2-devel@....oracle.com,
	Jan Kara <jack@...e.cz>, linux-ext4@...r.kernel.org,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	"Theodore Ts'o" <tytso@....edu>, Matthew Wilcox <matthew@....cx>
Subject: Re: [PATCH v3 1/9] string: introduce memweight

2012/6/21 Tony Luck <tony.luck@...il.com>:
> On Fri, Jun 8, 2012 at 5:50 PM, Akinobu Mita <akinobu.mita@...il.com> wrote:
>>  lib/string.c           |   36 ++++++++++++++++++++++++++++++++++++
>
> Is lib/string.c the right place for this?  I get a build error on the
> ia64 sim_defconfig:
>
>  LD      arch/ia64/hp/sim/boot/bootloader
>
> It fails because it pulls in lib/lib.a(string.o) to get some
> innocuous function like strcpy() ... but it also gets
> given memweight() which relies on __bitmap_weight()
> which it doesn't have, because it doesn't include lib/built-in.o
> (which is where bitmap.o, the definer of __bitmap_weight(), has
> been linked).
>
> Moving memweight() to lib/bitmap.c fixes the problem. But it
> isn't really clear that it belongs there either.  Perhaps it should
> be its own file lib/memweight.c that gets included in lib/lib.a?

I'll fix it by making lib/memweight.c as you suggested.
Thanks for your report and suggestion.
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