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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.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Michal Hocko <mhocko@suse.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michal Hocko
2015-11-06 16:28:49 -08:00
committed by Linus Torvalds
parent 8990332760
commit c62d25556b
19 changed files with 36 additions and 30 deletions
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fs/splice.c
+1 -1
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@@ -360,7 +360,7 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
break;
error = add_to_page_cache_lru(page, mapping, index,
GFP_KERNEL & mapping_gfp_mask(mapping));
mapping_gfp_constraint(mapping, GFP_KERNEL));
if (unlikely(error)) {
page_cache_release(page);
if (error == -EEXIST)