From: Davidlohr Bueso <d...@stgolabs.net> 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 <dbu...@suse.de> Cc: "Kirill A. Shutemov" <kir...@shutemov.name> Acked-by: Hugh Dickins <hu...@google.com> Cc: Oleg Nesterov <o...@redhat.com> Cc: Peter Zijlstra (Intel) <pet...@infradead.org> Cc: Rik van Riel <r...@redhat.com> Cc: Srikar Dronamraju <sri...@linux.vnet.ibm.com> Acked-by: Mel Gorman <mgor...@suse.de> Signed-off-by: Andrew Morton <a...@linux-foundation.org> Signed-off-by: Linus Torvalds <torva...@linux-foundation.org> https://jira.sw.ru/browse/PSBM-122663 (cherry picked from commit c8475d144abb1e62958cc5ec281d2a9e161c1946) Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com> --- mm/memory.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index 7e66dea08f3f..3e5124d14996 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2712,10 +2712,10 @@ void unmap_mapping_range(struct address_space *mapping, if (details.last_index < details.first_index) 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); - i_mmap_unlock_write(mapping); + i_mmap_unlock_read(mapping); } EXPORT_SYMBOL(unmap_mapping_range); -- 2.26.2 _______________________________________________ Devel mailing list Devel@openvz.org https://lists.openvz.org/mailman/listinfo/devel
