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buffer_head: remove redundant test from wait_on_buffer

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The comment suggests that when b_count equals zero it is calling
__wait_no_buffer to trigger some debug, but as there is no debug in
__wait_on_buffer the whole thing is redundant.

AFAICT from the git log this has been the case for at least 5 years, so
it seems safe just to remove this.

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Richard Kennedy 2010-08-09 17:18:42 -07:00 committed by Linus Torvalds
parent 76545066c8
commit a9877cc293
1 changed files with 1 additions and 6 deletions
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7
include/linux/buffer_head.h
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@ -314,15 +314,10 @@ map_bh(struct buffer_head *bh, struct super_block *sb, sector_t block)
bh->b_size = sb->s_blocksize;
}
/*
* Calling wait_on_buffer() for a zero-ref buffer is illegal, so we call into
* __wait_on_buffer() just to trip a debug check. Because debug code in inline
* functions is bloaty.
*/
static inline void wait_on_buffer(struct buffer_head *bh)
{
might_sleep();
if (buffer_locked(bh) || atomic_read(&bh->b_count) == 0)
if (buffer_locked(bh))
__wait_on_buffer(bh);
}