linux-kernel - [PATCH] block: Fix compiler warnings in blk-merge.c

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Message-Id: <82bcc02d9e54f08453726d141a91ad3cf0ac2b2e.1441552898.git.geliangtang@163.com>
Date:	Sun,  6 Sep 2015 23:24:34 +0800
From:	Geliang Tang <geliangtang@....com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Geliang Tang <geliangtang@....com>, linux-kernel@...r.kernel.org
Subject: [PATCH] block: Fix compiler warnings in blk-merge.c

Fix the following warnings:

  CC      block/blk-merge.o
In file included from block/blk-merge.c:7:0:
block/blk-merge.c: In function ‘blk_queue_split’:
include/linux/blkdev.h:1368:21: warning: ‘bvprv.bv_offset’ may be used
uninitialized in this function [-Wmaybe-uninitialized]
   ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
                     ^
block/blk-merge.c:70:21: note: ‘bvprv.bv_offset’ was declared here
  struct bio_vec bv, bvprv;
                     ^
In file included from block/blk-merge.c:7:0:
include/linux/blkdev.h:1368:21: warning: ‘bvprv.bv_len’ may be used
uninitialized in this function [-Wmaybe-uninitialized]
   ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
                     ^
block/blk-merge.c:70:21: note: ‘bvprv.bv_len’ was declared here
  struct bio_vec bv, bvprv;
                     ^
In file included from ./arch/x86/include/asm/page.h:70:0,
                 from ./arch/x86/include/asm/thread_info.h:11,
                 from include/linux/thread_info.h:54,
                 from ./arch/x86/include/asm/preempt.h:6,
                 from include/linux/preempt.h:64,
                 from include/linux/spinlock.h:50,
                 from include/linux/seqlock.h:35,
                 from include/linux/time.h:5,
                 from include/linux/stat.h:18,
                 from include/linux/module.h:10,
                 from block/blk-merge.c:5:
include/asm-generic/memory_model.h:52:52: warning: ‘bvprv.bv_page’ may
be used uninitialized in this function [-Wmaybe-uninitialized]
 #define __page_to_pfn(page) (unsigned long)((page) - vmemmap)
                                                    ^
block/blk-merge.c:70:21: note: ‘bvprv.bv_page’ was declared here
  struct bio_vec bv, bvprv;
                     ^

Signed-off-by: Geliang Tang <geliangtang@....com>
---
 block/blk-merge.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/blk-merge.c b/block/blk-merge.c
index d088cff..5bd84c8 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -67,7 +67,7 @@ static struct bio *blk_bio_segment_split(struct request_queue *q,
 					 struct bio_set *bs)
 {
 	struct bio *split;
-	struct bio_vec bv, bvprv;
+	struct bio_vec bv, bvprv = { NULL };
 	struct bvec_iter iter;
 	unsigned seg_size = 0, nsegs = 0, sectors = 0;
 	int prev = 0;
-- 
2.3.4


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