mm/memory.c: share the i_mmap_rwsem

The unmap_mapping_range family of functions do the unmapping of user pages (ultimately via zap_page_range_single) without touching the actual interval tree, thus share the lock. Signed-off-by: Davidlohr Bueso <[email protected]> Cc: "Kirill A. Shutemov" <[email protected]> Acked-by: 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]> Acked-by: Mel Gorman <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
herrnst · Dec 13, 2014 · c8475d1 · c8475d1
1 parent 1acf2e0
commit c8475d1
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/mm/memory.c b/mm/memory.c
@@ -2377,12 +2377,12 @@ void unmap_mapping_range(struct address_space *mapping,
 		details.last_index = ULONG_MAX;
 
 
-	i_mmap_lock_write(mapping);
+	i_mmap_lock_read(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_write(mapping);
+	i_mmap_unlock_read(mapping);
 }
 EXPORT_SYMBOL(unmap_mapping_range);