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

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Date:	Wed, 20 Jun 2012 16:12:51 -0700
From:	Tony Luck <tony.luck@...il.com>
To:	Akinobu Mita <akinobu.mita@...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

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?

-Tony
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