mm/xip: share the i_mmap_rwsem
__xip_unmap() will remove the xip sparse page from the cache and take down pte mapping, without altering the interval tree, thus share the i_mmap_rwsem when searching for the ptes to unmap. Additionally, tidy up the function a bit and make variables only local to the interval tree walk loop. Signed-off-by: NDavidlohr Bueso <dbueso@suse.de> Acked-by: N"Kirill A. Shutemov" <kirill@shutemov.name> Acked-by: NHugh Dickins <hughd@google.com> Cc: Oleg Nesterov <oleg@redhat.com> Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Acked-by: NMel Gorman <mgorman@suse.de> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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