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authorDavidlohr Bueso <dave@stgolabs.net>2014-12-12 16:54:42 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-13 12:42:46 -0800
commitc8475d144abb1e62958cc5ec281d2a9e161c1946 (patch)
tree0facd072749929812b47db09726943193a25a401 /mm/memory.c
parent1acf2e040721564d579297646862b8ea3dd4511b (diff)
downloadop-kernel-dev-c8475d144abb1e62958cc5ec281d2a9e161c1946.zip
op-kernel-dev-c8475d144abb1e62958cc5ec281d2a9e161c1946.tar.gz
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 <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>
Diffstat (limited to 'mm/memory.c')
-rw-r--r--mm/memory.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 039fab6..5afdb5b 100644
--- 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);
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