mm: move clearing of page->mapping to page_cache_tree_delete()

Clearing of page->mapping makes sense in page_cache_tree_delete() as
well and it will help us with batching things this way.

Link: http://lkml.kernel.org/r/20171010151937.26984-6-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/filemap.c b/mm/filemap.c
index 014109e66e4a59875fcd4665ddd7e584fb41d3fb..c649624d386c17281e9e7a6ebe58b343a2fc0163 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -165,6 +165,9 @@ static void page_cache_tree_delete(struct address_space *mapping,
                                     workingset_update_node, mapping);
        }
 
+       page->mapping = NULL;
+       /* Leave page->index set: truncation lookup relies upon it */
+
        if (shadow) {
                mapping->nrexceptional += nr;
                /*
@@ -250,9 +253,6 @@ void __delete_from_page_cache(struct page *page, void *shadow)
                                             inode_to_wb(mapping->host));
        }
        page_cache_tree_delete(mapping, page, shadow);
-
-       page->mapping = NULL;
-       /* Leave page->index set: truncation lookup relies upon it */
 }
 
 static void page_cache_free_page(struct address_space *mapping,