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[10/10] Btrfs: noinline merge_extent_mapping

Message ID 20171221224256.18196-11-bo.li.liu@oracle.com (mailing list archive)
State New, archived
Headers show

Commit Message

Liu Bo Dec. 21, 2017, 10:42 p.m. UTC 
In order to debug subtle bugs around merge_extent_mapping(), perf probe
can be used to check the arguments, but sometimes merge_extent_mapping()
got inlined by compiler and couldn't be probed.

This is adding noinline attribute to merge_extent_mapping().

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
---
 fs/btrfs/extent_map.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
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Patch

diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 40e4d30..f10a6fc 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -480,10 +480,10 @@  static struct extent_map *prev_extent_map(struct extent_map *em)
  * extent to map_start, and an extent that you want to insert, deal with overlap
  * and insert the best fitted new extent into the tree.
  */
-static int merge_extent_mapping(struct extent_map_tree *em_tree,
-				struct extent_map *existing,
-				struct extent_map *em,
-				u64 map_start, u64 map_len)
+static noinline int merge_extent_mapping(struct extent_map_tree *em_tree,
+					 struct extent_map *existing,
+					 struct extent_map *em,
+					 u64 map_start, u64 map_len)
 {
 	struct extent_map *prev;
 	struct extent_map *next;