linux-kernel - [PATCH] bio: use a static inline function for bio_integrity

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Date:	Fri, 26 Aug 2011 12:09:00 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Jens Axboe <jaxboe@...ionio.com>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Christoph Hellwig <hch@....de>,
	LKML <linux-kernel@...r.kernel.org>, Neil Brown <neilb@...e.de>
Subject: [PATCH] bio: use a static inline function for bio_integrity_clone

When CONFIG_BLK_DEV_INTEGRITY is not set, we get these warnings:

drivers/md/dm.c: In function 'split_bvec':
drivers/md/dm.c:1061:3: warning: statement with no effect
drivers/md/dm.c: In function 'clone_bio':
drivers/md/dm.c:1088:3: warning: statement with no effect

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 include/linux/bio.h |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/include/linux/bio.h b/include/linux/bio.h
index ce33e68..c98ecc8 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -527,7 +527,11 @@ extern void bio_integrity_init(void);
 #define bioset_integrity_create(a, b)	(0)
 #define bio_integrity_prep(a)		(0)
 #define bio_integrity_enabled(a)	(0)
-#define bio_integrity_clone(a, b, c, d)	(0)
+static inline int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
+				      gfp_t gfp_mask, struct bio_set *bs)
+{
+	return 0;
+}
 #define bioset_integrity_free(a)	do { } while (0)
 #define bio_integrity_free(a, b)	do { } while (0)
 #define bio_integrity_endio(a, b)	do { } while (0)
-- 
1.7.5.4

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/
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