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mm, fs: introduce mapping_gfp_constraint()

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There are many places which use mapping_gfp_mask to restrict a more
generic gfp mask which would be used for allocations which are not
directly related to the page cache but they are performed in the same
context.

Let's introduce a helper function which makes the restriction explicit and
easier to track.  This patch doesn't introduce any functional changes.

[[email protected]: coding-style fixes]
Signed-off-by: Michal Hocko <[email protected]>
Suggested-by: Andrew Morton <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Michal Hocko 2015-11-06 16:28:49 -08:00 • committed by Linus Torvalds
commit c62d25556b
19 changed files with 36 additions and 30 deletions
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2
fs/buffer.c
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@ -999,7 +999,7 @@ grow_dev_page(struct block_device *bdev, sector_t block,
int ret = 0; /* Will call free_more_memory() */
gfp_t gfp_mask;
gfp_mask = (mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS) | gfp;
gfp_mask = mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS) | gfp;
/*
* XXX: __getblk_slow() can not really deal with failure and