Btrfs: cut down stack usage in btree_write_cache_pages

This adds noinline_for_stack to two helpers used by
btree_write_cache_pages.  It shaves us down from 424 bytes on the
stack to 280.

Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 0f425dea4523..51299c261d56 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3393,9 +3393,10 @@ void wait_on_extent_buffer_writeback(struct extent_buffer *eb)
                     TASK_UNINTERRUPTIBLE);
 }
 
-static int lock_extent_buffer_for_io(struct extent_buffer *eb,
-                                     struct btrfs_fs_info *fs_info,
-                                     struct extent_page_data *epd)
+static noinline_for_stack int
+lock_extent_buffer_for_io(struct extent_buffer *eb,
+                          struct btrfs_fs_info *fs_info,
+                          struct extent_page_data *epd)
 {
         unsigned long i, num_pages;
         int flush = 0;
@@ -3500,7 +3501,7 @@ static void end_bio_extent_buffer_writepage(struct bio *bio, int err)
         bio_put(bio);
 }
 
-static int write_one_eb(struct extent_buffer *eb,
+static noinline_for_stack int write_one_eb(struct extent_buffer *eb,
                         struct btrfs_fs_info *fs_info,
                         struct writeback_control *wbc,
                         struct extent_page_data *epd)