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block: fix a warning when blkdev.h is included for !CONFIG_BLOCK builds 

disk_start_io_acct and disk_end_io_acct need at least a struct gendisk
forward declaration, but for weird historic reasons much of blkdev.h
is stubbed out for CONFIG_BLOCK=n.  Fix this by stubbing more out for
now, but eventually this header will need a massive cleanup.

Fixes: 956d510ee7 ("block: add disk/bio-based accounting helpers")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-05-28 15:41:23 +02:00 committed by Jens Axboe
parent e7ecc142e9
commit dc35ada425
1 changed files with 1 additions and 1 deletions
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2
include/linux/blkdev.h
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@ -1892,12 +1892,12 @@ static inline void blk_wake_io_task(struct task_struct *waiter)
wake_up_process(waiter);
}
#ifdef CONFIG_BLOCK
unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
unsigned int op);
void disk_end_io_acct(struct gendisk *disk, unsigned int op,
unsigned long start_time);
#ifdef CONFIG_BLOCK
/**
* bio_start_io_acct - start I/O accounting for bio based drivers
* @bio: bio to start account for