From 48ec833b7851438f02164ea846852ce4696f09ad Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Date: Mon, 22 Dec 2014 21:01:54 +0200 Subject: [PATCH] Revert "mm/memory.c: share the i_mmap_rwsem" This reverts commit c8475d144abb1e62958cc5ec281d2a9e161c1946. 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> --- mm/memory.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index 649e7d440bd7..ca920d1fd314 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -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); -- 2.49.0