Revert "mm/memory.c: share the i_mmap_rwsem"

This reverts commit c8475d1. There are several[1][2] of bug reports which points to this commit as potential cause[3]. Let's revert it until we figure out what's going on. [1] https://lkml.org/lkml/2014/11/14/342 [2] https://lkml.org/lkml/2014/12/22/213 [3] https://lkml.org/lkml/2014/12/9/741 Signed-off-by: Kirill A. Shutemov <[email protected]> Reported-by: Sasha Levin <[email protected]> Acked-by: Davidlohr Bueso <[email protected]> Cc: Hugh Dickins <[email protected]> Cc: Oleg Nesterov <[email protected]> Cc: Peter Zijlstra (Intel) <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Srikar Dronamraju <[email protected]> Cc: Mel Gorman <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
herrnst · Dec 22, 2014 · 48ec833 · 48ec833
1 parent 97bf6af
commit 48ec833
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/mm/memory.c b/mm/memory.c
@@ -2378,12 +2378,12 @@ void unmap_mapping_range(struct address_space *mapping,
 		details.last_index = ULONG_MAX;
 
 
-	i_mmap_lock_read(mapping);
+	i_mmap_lock_write(mapping);
 	if (unlikely(!RB_EMPTY_ROOT(&mapping->i_mmap)))
 		unmap_mapping_range_tree(&mapping->i_mmap, &details);
 	if (unlikely(!list_empty(&mapping->i_mmap_nonlinear)))
 		unmap_mapping_range_list(&mapping->i_mmap_nonlinear, &details);
-	i_mmap_unlock_read(mapping);
+	i_mmap_unlock_write(mapping);
 }
 EXPORT_SYMBOL(unmap_mapping_range);