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Ming Lei b21e11c5c8 block: fix build warning in merging bvecs 
Commit f6970f83ef ("block: don't check if adjacent bvecs in one bio can
be mergeable") changes bvec merge by only considering two bvecs from
different bios. However, if the former bio doesn't inlcude any io bvec,
then the following warning may be triggered:

 warning: ‘bvec.bv_offset’ may be used uninitialized in this function [-Wmaybe-uninitialized]

In practice, it shouldn't be triggered.

Fixes it by adding check on former bio, the check shouldn't add any cost
given 'bio->bi_iter' can be hit in cache.

Reported-by: Jens Axboe <axboe@kernel.dk>
Fixes: f6970f83ef ("block: don't check if adjacent bvecs in one bio can be mergeable")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 		2019-04-08 10:57:10 -06:00
..
partitions partitions/aix: append null character to print data from disk 2018-07-27 09:17:41 -06:00
Kconfig block: remove CONFIG_LBDAF 2019-04-06 10:48:35 -06:00
Kconfig.iosched block: remove legacy IO schedulers 2018-11-07 13:42:32 -07:00
Makefile block: remove legacy IO schedulers 2018-11-07 13:42:32 -07:00
badblocks.c badblocks: fix wrong return value in badblocks_set if badblocks are disabled 2017-11-03 11:29:50 -07:00
bfq-cgroup.c block, bfq: fix some typos in comments 2019-04-08 10:05:43 -06:00
bfq-iosched.c block, bfq: fix some typos in comments 2019-04-08 10:05:43 -06:00
bfq-iosched.h block, bfq: fix some typos in comments 2019-04-08 10:05:43 -06:00
bfq-wf2q.c block, bfq: fix some typos in comments 2019-04-08 10:05:43 -06:00
bio-integrity.c block: remove the bio_integrity_advance export 2018-12-16 08:33:57 -07:00
bio.c block: bio: ensure newly added bio flags don't override BVEC_POOL_IDX 2019-04-04 09:30:37 -06:00
blk-cgroup.c blkcg: Fix kernel-doc warnings 2019-03-20 14:39:09 -06:00
blk-core.c mm: refactor readahead defines in mm.h 2019-03-12 10:04:01 -07:00
blk-exec.c block: remove dead elevator code 2018-11-07 13:42:32 -07:00
blk-flush.c blk-mq: use blk_mq_put_driver_tag() to put tag 2019-03-24 10:26:16 -06:00
blk-integrity.c block: merge BIOVEC_SEG_BOUNDARY into biovec_phys_mergeable 2018-09-24 12:33:57 -06:00
blk-ioc.c block: remove the queue_lock indirection 2018-11-15 12:17:28 -07:00
blk-iolatency.c blk-iolatency: #include "blk.h" 2019-03-20 14:19:38 -06:00
blk-lib.c block: fix 32 bit overflow in __blkdev_issue_discard() 2018-11-14 08:17:18 -07:00
blk-map.c Merge branch 'for-4.16/block' of git://git.kernel.dk/linux-block 2018-01-29 11:51:49 -08:00
blk-merge.c block: fix build warning in merging bvecs 2019-04-08 10:57:10 -06:00
blk-mq-cpumap.c blk-mq: initial support for multiple queue maps 2018-11-07 13:45:00 -07:00
blk-mq-debugfs-zoned.c block: Cleanup license notice 2019-01-17 21:21:40 -07:00
blk-mq-debugfs.c SCSI misc on 20190306 2019-03-09 16:53:47 -08:00
blk-mq-debugfs.h blk-mq-debugfs: support rq_qos 2018-12-16 19:53:47 -07:00
blk-mq-pci.c blk-mq: initial support for multiple queue maps 2018-11-07 13:45:00 -07:00
blk-mq-rdma.c blk-mq-rdma: pass in queue map to blk_mq_rdma_map_queues 2018-12-13 09:59:08 +01:00
blk-mq-sched.c blk-mq: save queue mapping result into ctx directly 2019-02-01 08:33:04 -07:00
blk-mq-sched.h block: mq-deadline: Fix write completion handling 2018-12-17 11:19:39 -07:00
blk-mq-sysfs.c blk-mq: export hctx->type in debugfs instead of sysfs 2018-12-17 05:44:45 -07:00
blk-mq-tag.c blk-mq: save queue mapping result into ctx directly 2019-02-01 08:33:04 -07:00
blk-mq-tag.h Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block 2017-11-14 15:32:19 -08:00
blk-mq-virtio.c blk-mq: initial support for multiple queue maps 2018-11-07 13:45:00 -07:00
blk-mq.c blk-mq: fix sbitmap ws_active for shared tags 2019-03-25 13:05:47 -06:00
blk-mq.h blk-mq: use blk_mq_put_driver_tag() to put tag 2019-03-24 10:26:16 -06:00
blk-pm.c block: remove the queue_lock indirection 2018-11-15 12:17:28 -07:00
blk-pm.h block: remove the queue_lock indirection 2018-11-15 12:17:28 -07:00
blk-rq-qos.c blk-mq-debugfs: support rq_qos 2018-12-16 19:53:47 -07:00
blk-rq-qos.h block: fix blk-iolatency accounting underflow 2018-12-17 11:19:54 -07:00
blk-settings.c block: kill QUEUE_FLAG_FLUSH_NQ 2019-02-09 15:40:24 -07:00
blk-softirq.c block: remove a few unused exports 2018-11-15 12:13:25 -07:00
blk-stat.c block: remove a few unused exports 2018-11-15 12:13:25 -07:00
blk-stat.h block: deactivate blk_stat timer in wbt_disable_default() 2018-12-12 06:47:51 -07:00
blk-sysfs.c block: add BLK_MQ_POLL_CLASSIC for hybrid poll and return EINVAL for unexpected value 2019-03-20 14:02:07 -06:00
blk-throttle.c blkcg: consolidate bio_issue_init() to be a part of core 2018-12-07 22:26:37 -07:00
blk-timeout.c block: don't hold the queue_lock over blk_abort_request 2018-11-15 12:13:18 -07:00
blk-wbt.c blk-wbt: Declare local functions static 2019-01-24 11:09:21 -07:00
blk-wbt.h block: remove external dependency on wbt_flags 2018-07-09 09:07:54 -06:00
blk-zoned.c for-4.21/block-20181221 2018-12-28 13:19:59 -08:00
blk.h block: pass page to xen_biovec_phys_mergeable 2019-04-01 12:11:13 -06:00
bounce.c block: bounce: make sure that bvec table is updated 2019-02-21 10:58:44 -07:00
bsg-lib.c scsi: bsg-lib: handle bidi requests without block layer help 2019-02-05 21:27:40 -05:00
bsg.c scsi: bsg-lib: handle bidi requests without block layer help 2019-02-05 21:27:40 -05:00
cmdline-parser.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
compat_ioctl.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
elevator.c block: remove unused variable 'def' 2019-04-08 08:13:12 -06:00
genhd.c block: Replace function name in string with __func__ 2019-02-28 14:09:08 -07:00
ioctl.c block: Introduce BLKGETNRZONES ioctl 2018-10-25 11:17:40 -06:00
ioprio.c block: add ioprio_check_cap function 2018-05-31 10:50:54 -04:00
kyber-iosched.c kyber: use sbitmap add_wait_queue/list_del wait helpers 2018-12-20 12:17:21 -07:00
mq-deadline.c block: mq-deadline: Fix write completion handling 2018-12-17 11:19:39 -07:00
opal_proto.h block: sed-opal: add token for OPAL_LIFECYCLE 2019-04-06 11:09:13 -06:00
partition-generic.c block: return just one value from part_in_flight 2018-12-10 08:30:38 -07:00
scsi_ioctl.c block: consistently use GFP_NOIO instead of __GFP_NORECLAIM 2018-05-14 08:55:18 -06:00
sed-opal.c block: sed-opal: rename next to execute_steps 2019-04-06 11:09:13 -06:00
t10-pi.c block: move dif_prepare/dif_complete functions to block layer 2018-07-30 08:27:02 -06:00