On Mon, 2017-07-31 at 09:43 -0700, Nadav Amit wrote: > Reading tlb_flush_pending while the page-table lock is taken does not > require a barrier, since the lock/unlock already acts as a barrier. > Removing the barrier in mm_tlb_flush_pending() to address this issue. > > However, migrate_misplaced_transhuge_page() calls > mm_tlb_flush_pending() > while the page-table lock is already released, which may present a > problem on architectures with weak memory model (PPC). To deal with > this > case, a new parameter is added to mm_tlb_flush_pending() to indicate > if it is read without the page-table lock taken, and calling > smp_mb__after_unlock_lock() in this case. > > Cc: Minchan Kim <minchan@xxxxxxxxxx> > Cc: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx> > Cc: Andy Lutomirski <luto@xxxxxxxxxx> > Cc: Mel Gorman <mgorman@xxxxxxx> > Cc: Rik van Riel <riel@xxxxxxxxxx> > > Signed-off-by: Nadav Amit <namit@xxxxxxxxxx> > Acked-by: Rik van Riel <riel@xxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
