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Btrfs: noinline merge_extent_mapping

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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>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2018-01-05 12:51:17 -07:00 committed by David Sterba
parent 9a7e10e7ba
commit 5f4791f4a6
1 changed files with 4 additions and 4 deletions
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fs/btrfs/extent_map.c
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@ -480,7 +480,7 @@ static struct extent_map *prev_extent_map(struct extent_map *em)
* 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,
static noinline int merge_extent_mapping(struct extent_map_tree *em_tree,
struct extent_map *existing,
struct extent_map *em,
u64 map_start)