[PATCH AUTOSEL for 4.9 262/293] mm: pin address_space before dereferencing it while isolating an LRU page

From: Mel Gorman [ Upstream commit 69d763fc6d3aee787a3e8c8c35092b4f4960fa5d ] Minchan Kim asked the following question -- what locks protects address_space destroying when race happens between inode trauncation and __isolate_lru_page? Jan Kara clarified by

[PATCH AUTOSEL for 4.9 262/293] mm: pin address_space before dereferencing it while isolating an LRU page

From: Mel Gorman [ Upstream commit 69d763fc6d3aee787a3e8c8c35092b4f4960fa5d ] Minchan Kim asked the following question -- what locks protects address_space destroying when race happens between inode trauncation and __isolate_lru_page? Jan Kara clarified by describing the race as follows CPU1