X-Git-Url: https://git.kernelconcepts.de/?a=blobdiff_plain;f=mm%2Fmemory.c;h=deb679c31f2ab897cafebf72643aec4f66233308;hb=296291cdd1629c308114504b850dc343eabc2782;hp=9cb27470fee991cb874676bb0cbc0f694b5e1d36;hpb=e9a7bed40cbc09eee4b7a15509726a44565805be;p=karo-tx-linux.git

diff --git a/mm/memory.c b/mm/memory.c
index 9cb27470fee9..deb679c31f2a 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2426,6 +2426,8 @@ void unmap_mapping_range(struct address_space *mapping,
 	if (details.last_index < details.first_index)
 		details.last_index = ULONG_MAX;
 
+
+	/* DAX uses i_mmap_lock to serialise file truncate vs page fault */
 	i_mmap_lock_write(mapping);
 	if (unlikely(!RB_EMPTY_ROOT(&mapping->i_mmap)))
 		unmap_mapping_range_tree(&mapping->i_mmap, &details);