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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/ntfs/file.c
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@ -525,8 +525,8 @@ static inline int __ntfs_grab_cache_pages(struct address_space *mapping,
}
}
err = add_to_page_cache_lru(*cached_page, mapping,
index,
GFP_KERNEL & mapping_gfp_mask(mapping));
index,
mapping_gfp_constraint(mapping, GFP_KERNEL));
if (unlikely(err)) {
if (err == -EEXIST)
continue;