X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=blobdiff_plain;f=mm%2Fmemory.c;h=791f811fb2becbddf1764ccb1943b020fdbba531;hp=829d437354022959eeca37082f695e2ee73025ed;hb=81e0a6ed9888d145d25b7ccece6e1016626bc3c2;hpb=4d18de944954b973fede3259d206022f90549269

diff --git a/mm/memory.c b/mm/memory.c
index 829d43735402..791f811fb2be 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1228,16 +1228,24 @@ static inline unsigned long zap_pmd_range(struct mmu_gather *tlb,
 	do {
 		next = pmd_addr_end(addr, end);
 		if (pmd_trans_huge(*pmd)) {
-			if (next-addr != HPAGE_PMD_SIZE) {
+			if (next - addr != HPAGE_PMD_SIZE) {
 				VM_BUG_ON(!rwsem_is_locked(&tlb->mm->mmap_sem));
 				split_huge_page_pmd(vma->vm_mm, pmd);
 			} else if (zap_huge_pmd(tlb, vma, pmd))
-				continue;
+				goto next;
 			/* fall through */
 		}
-		if (pmd_none_or_clear_bad(pmd))
-			continue;
+		/*
+		 * Here there can be other concurrent MADV_DONTNEED or
+		 * trans huge page faults running, and if the pmd is
+		 * none or trans huge it can change under us. This is
+		 * because MADV_DONTNEED holds the mmap_sem in read
+		 * mode.
+		 */
+		if (pmd_none_or_trans_huge_or_clear_bad(pmd))
+			goto next;
 		next = zap_pte_range(tlb, vma, pmd, addr, next, details);
+next:
 		cond_resched();
 	} while (pmd++, addr = next, addr != end);
 
@@ -1350,8 +1358,11 @@ unsigned long unmap_vmas(struct mmu_gather *tlb,
 				 * Since no pte has actually been setup, it is
 				 * safe to do nothing in this case.
 				 */
-				if (vma->vm_file)
-					unmap_hugepage_range(vma, start, end, NULL);
+				if (vma->vm_file) {
+					mutex_lock(&vma->vm_file->f_mapping->i_mmap_mutex);
+					__unmap_hugepage_range_final(vma, start, end, NULL);
+					mutex_unlock(&vma->vm_file->f_mapping->i_mmap_mutex);
+				}
 
 				start = end;
 			} else
@@ -1385,6 +1396,7 @@ unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address,
 	tlb_finish_mmu(&tlb, address, end);
 	return end;
 }
+EXPORT_SYMBOL_GPL(zap_page_range);
 
 /**
  * zap_vma_ptes - remove ptes mapping the vma