linux-kernel - linux-next: build failure after merge of the final tree (block tree related)

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Date:	Tue, 26 Mar 2013 17:31:59 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Kent Overstreet <koverstreet@...gle.com>
Subject: linux-next: build failure after merge of the final tree (block tree
 related)

Hi all,

After merging the final tree, today's linux-next build (powerpc allyesconfig)
failed like this:

drivers/built-in.o: In function `bio_alloc_pages':
(.opd+0x2364a8): multiple definition of `bio_alloc_pages'
fs/built-in.o:(.opd+0x7188): first defined here

Caused by an interaction between commits a07876064a0b ("block: Add
bio_alloc_pages()") and commit cafe56359144 ("bcache: A block layer
cache") from the block tree.

I have applied the following fix patch (this should have happened in
merge commit 12f45f28441e "Merge branch 'for-3.10/drivers' into
for-next"):

From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Tue, 26 Mar 2013 17:26:45 +1100
Subject: [PATCH] block: remove the extra copy of bio_alloc_pages

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 drivers/md/bcache/util.c | 18 ------------------
 drivers/md/bcache/util.h |  2 --
 2 files changed, 20 deletions(-)

diff --git a/drivers/md/bcache/util.c b/drivers/md/bcache/util.c
index dcec2e4..671a55d 100644
--- a/drivers/md/bcache/util.c
+++ b/drivers/md/bcache/util.c
@@ -237,24 +237,6 @@ start:		bv->bv_len	= min_t(size_t, PAGE_SIZE - bv->bv_offset,
 }
 EXPORT_SYMBOL_GPL(bio_map);
 
-int bio_alloc_pages(struct bio *bio, gfp_t gfp)
-{
-	int i;
-	struct bio_vec *bv;
-
-	bio_for_each_segment(bv, bio, i) {
-		bv->bv_page = alloc_page(gfp);
-		if (!bv->bv_page) {
-			while (bv-- != bio->bi_io_vec + bio->bi_idx)
-				__free_page(bv->bv_page);
-			return -ENOMEM;
-		}
-	}
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(bio_alloc_pages);
-
 /*
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group (Any
  * use permitted, subject to terms of PostgreSQL license; see.)
diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h
index 56705fd..499d746 100644
--- a/drivers/md/bcache/util.h
+++ b/drivers/md/bcache/util.h
@@ -570,8 +570,6 @@ static inline unsigned fract_exp_two(unsigned x, unsigned fract_bits)
 
 void bio_map(struct bio *bio, void *base);
 
-int bio_alloc_pages(struct bio *bio, gfp_t gfp);
-
 static inline sector_t bdev_sectors(struct block_device *bdev)
 {
 	return bdev->bd_inode->i_size >> 9;
-- 
1.8.1

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au

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