Re: [PATCH] block: work around sparse in queue_limits_commit_update

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On 6/12/24 17:37, John Garry wrote:
> On 10/05/2024 02:40, Damien Le Moal wrote:
> 
> Hi Damien,
> 
>>> block/bdev.c:377:17: warning: symbol 'blockdev_mnt' was not declared.
>>> Should it be static?
>>> block/blk-settings.c:263:9: warning: context imbalance in
>>> 'queue_limits_commit_update' - wrong count at exit
>>> block/blk-cgroup.c:811:5: warning: context imbalance in
>>> 'blkg_conf_prep' - wrong count at exit
>>> block/blk-cgroup.c:941:9: warning: context imbalance in
>>> 'blkg_conf_exit' - different lock contexts for basic block
>>> block/blk-iocost.c:732:9: warning: context imbalance in 'iocg_lock' -
>>> wrong count at exit
>>> block/blk-iocost.c:743:28: warning: context imbalance in 'iocg_unlock'
>>> - unexpected unlock
>>> block/blk-zoned.c:576:30: warning: context imbalance in
>>> 'disk_get_and_lock_zone_wplug' - wrong count at exit
>>> block/blk-zoned.c: note: in included file (through include/linux/blkdev.h):
>>> ./include/linux/bio.h:592:9: warning: context imbalance in
>>> 'blk_zone_wplug_handle_write' - unexpected unlock
>>> block/blk-zoned.c:1721:31: warning: context imbalance in
>>> 'blk_revalidate_seq_zone' - unexpected unlock
>>> block/bfq-iosched.c:5498:9: warning: context imbalance in
>>> 'bfq_exit_icq' - different lock contexts for basic block
>>>
>>> Actually most pre-date v6.9 anyway, apart from the zoned stuff. And the
>>> bdev.c static warning is an outstanding patch, which I replied to.
>> I will have a look at the zone stuff. This is all from the new addition of zone
>> write plugging, so all my bad (I did run with lockdep but did not compile test
>> with sparse).
>>
> Can you confirm that you looked to solve these zoned device sparse 
> warnings and they are difficult to solve?

Yes, I had a look but failed to see any way to remove these. Annotations did not
help, at best only changing these warnings into other warnings.


-- 
Damien Le Moal
Western Digital Research





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