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From: Damien Le Moal <damien.lemoal@wdc.com>
To: linux-block@vger.kernel.org, Jens Axboe <axboe@kernel.dk>
Cc: linux-scsi@vger.kernel.org,
	"Martin K . Petersen" <martin.petersen@oracle.com>,
	Christoph Hellwig <hch@lst.de>
Subject: [PATCH] scsi: sd_zbc: Fix compilation warning
Date: Mon, 15 Jul 2019 14:38:33 +0900	[thread overview]
Message-ID: <20190715053833.5973-1-damien.lemoal@wdc.com> (raw)

kbuild test robot gets the following compilation warning using gcc 7.4
cross compilation for c6x (GCC_VERSION=7.4.0 make.cross ARCH=c6x).

   In file included from include/asm-generic/bug.h:18:0,
                    from arch/c6x/include/asm/bug.h:12,
                    from include/linux/bug.h:5,
                    from include/linux/thread_info.h:12,
                    from include/asm-generic/current.h:5,
                    from ./arch/c6x/include/generated/asm/current.h:1,
                    from include/linux/sched.h:12,
                    from include/linux/blkdev.h:5,
                    from drivers//scsi/sd_zbc.c:11:
   drivers//scsi/sd_zbc.c: In function 'sd_zbc_read_zones':
>> include/linux/kernel.h:62:48: warning: 'zone_blocks' may be used
   uninitialized in this function [-Wmaybe-uninitialized]
    #define __round_mask(x, y) ((__typeof__(x))((y)-1))
                                                   ^
   drivers//scsi/sd_zbc.c:464:6: note: 'zone_blocks' was declared here
     u32 zone_blocks;
         ^~~~~~~~~~~

Fix this by initializing the zone_blocks variable to 0.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
---
 drivers/scsi/sd_zbc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
index db16c19e05c4..5d6ff3931632 100644
--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -461,7 +461,7 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
 {
 	struct gendisk *disk = sdkp->disk;
 	unsigned int nr_zones;
-	u32 zone_blocks;
+	u32 zone_blocks = 0;
 	int ret;
 
 	if (!sd_is_zoned(sdkp))
-- 
2.21.0


             reply	other threads:[~2019-07-15  5:38 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-15  5:38 Damien Le Moal [this message]
2019-07-16 14:05 ` [PATCH] scsi: sd_zbc: Fix compilation warning Jens Axboe
2019-07-16 14:34   ` Martin K. Petersen
2019-07-17  1:24     ` Damien Le Moal
2019-07-17  1:27       ` Martin K. Petersen

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