X-Git-Url: http://git.cascardo.eti.br/?a=blobdiff_plain;f=mm%2Fmemory.c;h=bb1369f7b9b4ba8af51d90a40de8f522aa2470dc;hb=befddb21c845f8fb49e637997891ef97c6a869dc;hp=e0a9b0ce4f102f8cfef2d6d7c6581d71f7595ff4;hpb=f59dc2bb5a50b26ea751f9eac1c81e4cc7de5257;p=cascardo%2Flinux.git

diff --git a/mm/memory.c b/mm/memory.c
index e0a9b0ce4f10..bb1369f7b9b4 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -184,10 +184,14 @@ static int tlb_next_batch(struct mmu_gather *tlb)
 		return 1;
 	}
 
+	if (tlb->batch_count == MAX_GATHER_BATCH_COUNT)
+		return 0;
+
 	batch = (void *)__get_free_pages(GFP_NOWAIT | __GFP_NOWARN, 0);
 	if (!batch)
 		return 0;
 
+	tlb->batch_count++;
 	batch->next = NULL;
 	batch->nr   = 0;
 	batch->max  = MAX_GATHER_BATCH;
@@ -216,6 +220,7 @@ void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, bool fullmm)
 	tlb->local.nr   = 0;
 	tlb->local.max  = ARRAY_SIZE(tlb->__pages);
 	tlb->active     = &tlb->local;
+	tlb->batch_count = 0;
 
 #ifdef CONFIG_HAVE_RCU_TABLE_FREE
 	tlb->batch = NULL;
@@ -3706,6 +3711,14 @@ retry:
 		if (pmd_trans_huge(orig_pmd)) {
 			unsigned int dirty = flags & FAULT_FLAG_WRITE;
 
+			/*
+			 * If the pmd is splitting, return and retry the
+			 * the fault.  Alternative: wait until the split
+			 * is done, and goto retry.
+			 */
+			if (pmd_trans_splitting(orig_pmd))
+				return 0;
+
 			if (pmd_numa(orig_pmd))
 				return do_huge_pmd_numa_page(mm, vma, address,
 							     orig_pmd, pmd);