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Commit c8475d14 authored by Davidlohr Bueso's avatar Davidlohr Bueso Committed by Linus Torvalds
Browse files

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: default avatarDavidlohr Bueso <dbueso@suse.de>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Acked-by: default avatarHugh 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: default avatarMel Gorman <mgorman@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1acf2e04

mm/memory.c

+2 −2
Original line number Diff line number Diff line
@@ -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);