Commit 48ec833b authored Dec 22, 2014 by Kirill A. Shutemov Committed by Linus Torvalds Dec 22, 2014

Revert "mm/memory.c: share the i_mmap_rwsem"

This reverts commit c8475d14.

There are several[1][2] of bug reports which points to this commit as potential
cause[3].

Let's revert it until we figure out what's going on.

[1] https://lkml.org/lkml/2014/11/14/342
[2] https://lkml.org/lkml/2014/12/22/213
[3] https://lkml.org/lkml/2014/12/9/741



Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Acked-by: Davidlohr Bueso <dave@stgolabs.net>
Cc: 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>
Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 97bf6af1

mm/memory.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -2378,12 +2378,12 @@ void unmap_mapping_range(struct address_space *mapping,
		details.last_index = ULONG_MAX;


		i_mmap_lock_read(mapping);
		i_mmap_lock_write(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_read(mapping);
		i_mmap_unlock_write(mapping);
		}
		EXPORT_SYMBOL(unmap_mapping_range);

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