AcoSail/kernel_optimize_test
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buffer: grow_dev_page() should use __GFP_NOFAIL for all cases

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We currently use it for find_or_create_page(), which means that it
cannot fail. Ensure we also pass in 'retry == true' to
alloc_page_buffers(), which also ensure that it cannot fail.

After this, there are no failure cases in grow_dev_page() that
occur because of a failed memory allocation.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2017-09-27 05:45:36 -06:00
parent 640ab98fb3
commit 94dc24c0c5
1 changed files with 1 additions and 5 deletions
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6
fs/buffer.c
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@ -988,8 +988,6 @@ grow_dev_page(struct block_device *bdev, sector_t block,
gfp_mask |= __GFP_NOFAIL;
page = find_or_create_page(inode->i_mapping, index, gfp_mask);
if (!page)
return ret;
BUG_ON(!PageLocked(page));
@ -1008,9 +1006,7 @@ grow_dev_page(struct block_device *bdev, sector_t block,
/*
* Allocate some buffers for this page
*/
bh = alloc_page_buffers(page, size, false);
if (!bh)
goto failed;
bh = alloc_page_buffers(page, size, true);
/*
* Link the page to the buffers and initialise them. Take the