linux-kernel - [PATCH] bitops: Move find_next

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Message-ID: <alpine.DEB.2.00.1108301427170.10125@ayla.of.borg>
Date:	Tue, 30 Aug 2011 15:17:03 +0200 (CEST)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Akinobu Mita <akinobu.mita@...il.com>
cc:	Greg Ungerer <gerg@...inux.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org,
	Linux/m68k <linux-m68k@...ts.linux-m68k.org>
Subject: [PATCH] bitops: Move find_next_bit.o from lib-y to obj-y

If there are no builtin users of find_next_bit_le() and
find_next_zero_bit_le(), these functions are not present in the kernel
image, causing m68k allmodconfig to fail with:

ERROR: "find_next_zero_bit_le" [fs/ufs/ufs.ko] undefined!
ERROR: "find_next_bit_le" [fs/udf/udf.ko] undefined!
ERROR: "find_next_zero_bit_le" [fs/reiserfs/reiserfs.ko] undefined!
ERROR: "find_next_bit_le" [fs/ocfs2/ocfs2.ko] undefined!
ERROR: "find_next_zero_bit_le" [fs/ocfs2/ocfs2.ko] undefined!
ERROR: "find_next_zero_bit_le" [fs/nilfs2/nilfs2.ko] undefined!
ERROR: "find_next_bit_le" [fs/ext4/ext4.ko] undefined!
ERROR: "find_next_zero_bit_le" [fs/ext4/ext4.ko] undefined!
ERROR: "find_next_zero_bit_le" [fs/ext3/ext3.ko] undefined!
ERROR: "find_next_zero_bit_le" [fs/ext2/ext2.ko] undefined!
ERROR: "find_next_zero_bit_le" [drivers/media/rc/ite-cir.ko] undefined!
ERROR: "find_next_bit_le" [drivers/media/rc/ite-cir.ko] undefined!
ERROR: "find_next_zero_bit_le" [drivers/md/dm-log.ko] undefined!
ERROR: "find_next_bit_le" [drivers/block/drbd/drbd.ko] undefined!
ERROR: "find_next_zero_bit_le" [drivers/block/drbd/drbd.ko] undefined!

This started to happen after commit 171d809df1896c1022f9778cd2788be6c255a7dc
("m68k: merge mmu and non-mmu bitops.h"), as m68k had its own inline
versions before.

commit 63e424c84429903c92a0f1e9654c31ccaf6694d0 ("arch: remove
CONFIG_GENERIC_FIND_{NEXT_BIT,BIT_LE,LAST_BIT}") added find_last_bit.o to
obj-y (so it's always included), but find_next_bit.o to lib-y (so it gets
removed by the linker if there are no builtin users).

Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
Sorry, I didn't notice it before, as m68k allmodconfig has been suffering
from too many build breakages (for which patches are available) lately.

Does it happen elsewhere, too?

 lib/Makefile |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Makefile b/lib/Makefile
index d5d175c..3f5bc6d 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -12,7 +12,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
 	 idr.o int_sqrt.o extable.o prio_tree.o \
 	 sha1.o md5.o irq_regs.o reciprocal_div.o argv_split.o \
 	 proportions.o prio_heap.o ratelimit.o show_mem.o \
-	 is_single_threaded.o plist.o decompress.o find_next_bit.o
+	 is_single_threaded.o plist.o decompress.o

 lib-$(CONFIG_MMU) += ioremap.o
 lib-$(CONFIG_SMP) += cpumask.o
@@ -22,7 +22,7 @@ lib-y	+= kobject.o kref.o klist.o
 obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
 	 bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
 	 string_helpers.o gcd.o lcm.o list_sort.o uuid.o flex_array.o \
-	 bsearch.o find_last_bit.o
+	 bsearch.o find_last_bit.o find_next_bit.o
 obj-y += kstrtox.o
 obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o

-- 
1.7.0.4

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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