From 6afdb859b71019143b8eecda02b8b29b03185055 Mon Sep 17 00:00:00 2001 From: Michal Hocko Date: Wed, 24 Jun 2015 16:58:06 -0700 Subject: [PATCH] mm: do not ignore mapping_gfp_mask in page cache allocation paths page_cache_read, do_generic_file_read, __generic_file_splice_read and __ntfs_grab_cache_pages currently ignore mapping_gfp_mask when calling add_to_page_cache_lru which might cause recursion into fs down in the direct reclaim path if the mapping really relies on GFP_NOFS semantic. This doesn't seem to be the case now because page_cache_read (page fault path) doesn't seem to suffer from the reclaim recursion issues and do_generic_file_read and __generic_file_splice_read also shouldn't be called under fs locks which would deadlock in the reclaim path. Anyway it is better to obey mapping gfp mask and prevent from later breakage. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Michal Hocko Cc: Dave Chinner Cc: Neil Brown Cc: Johannes Weiner Cc: Al Viro Cc: Mel Gorman Cc: Rik van Riel Cc: Tetsuo Handa Cc: Anton Altaparmakov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-format-patch failed