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mm/memory.c: share the i_mmap_rwsem

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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 <dbueso@suse.de>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Davidlohr Bueso 2014-12-12 16:54:42 -08:00 committed by Linus Torvalds
parent 1acf2e0407
commit c8475d144a
1 changed files with 2 additions and 2 deletions
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4
mm/memory.c
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@ -2377,12 +2377,12 @@ void unmap_mapping_range(struct address_space *mapping,
details.last_index = ULONG_MAX; details.last_index = ULONG_MAX;
i_mmap_lock_write(mapping); i_mmap_lock_read(mapping);
if (unlikely(!RB_EMPTY_ROOT(&mapping->i_mmap))) if (unlikely(!RB_EMPTY_ROOT(&mapping->i_mmap)))
unmap_mapping_range_tree(&mapping->i_mmap, &details); unmap_mapping_range_tree(&mapping->i_mmap, &details);
if (unlikely(!list_empty(&mapping->i_mmap_nonlinear))) if (unlikely(!list_empty(&mapping->i_mmap_nonlinear)))
unmap_mapping_range_list(&mapping->i_mmap_nonlinear, &details); unmap_mapping_range_list(&mapping->i_mmap_nonlinear, &details);
i_mmap_unlock_write(mapping); i_mmap_unlock_read(mapping);
} }
EXPORT_SYMBOL(unmap_mapping_range); EXPORT_SYMBOL(unmap_mapping_range);