zap_pte_range loops from @addr to @end. In the middle, if it runs out of batching slots, TLB entries needs to be flushed for @start to @interim, NOT @interim to @end. Since ARC port doesn't use page free batching I can't test it myself but this seems like the right thing to do. Observed this when working on a fix for the issue at thread: http://www.spinics.net/lists/linux-arch/msg21736.html Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Mel Gorman <mgorman@xxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Cc: Rik van Riel <riel@xxxxxxxxxx> Cc: David Rientjes <rientjes@xxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: linux-mm@xxxxxxxxx Cc: linux-arch@xxxxxxxxxxxxxxx <linux-arch@xxxxxxxxxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Max Filippov <jcmvbkbc@xxxxxxxxx> --- mm/memory.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/mm/memory.c b/mm/memory.c index 6dc1882..d9d5fd9 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1110,6 +1110,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb, spinlock_t *ptl; pte_t *start_pte; pte_t *pte; + unsigned long range_start = addr; again: init_rss_vec(rss); @@ -1215,12 +1216,14 @@ again: force_flush = 0; #ifdef HAVE_GENERIC_MMU_GATHER - tlb->start = addr; - tlb->end = end; + tlb->start = range_start; + tlb->end = addr; #endif tlb_flush_mmu(tlb); - if (addr != end) + if (addr != end) { + range_start = addr; goto again; + } } return addr; -- 1.7.10.4 -- 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>