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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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4
fs/mpage.c
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@ -361,7 +361,7 @@ mpage_readpages(struct address_space *mapping, struct list_head *pages,
sector_t last_block_in_bio = 0;
struct buffer_head map_bh;
unsigned long first_logical_block = 0;
gfp_t gfp = GFP_KERNEL & mapping_gfp_mask(mapping);
gfp_t gfp = mapping_gfp_constraint(mapping, GFP_KERNEL);
map_bh.b_state = 0;
map_bh.b_size = 0;
@ -397,7 +397,7 @@ int mpage_readpage(struct page *page, get_block_t get_block)
sector_t last_block_in_bio = 0;
struct buffer_head map_bh;
unsigned long first_logical_block = 0;
gfp_t gfp = GFP_KERNEL & mapping_gfp_mask(page->mapping);
gfp_t gfp = mapping_gfp_constraint(page->mapping, GFP_KERNEL);
map_bh.b_state = 0;
map_bh.b_size = 0;