Merge commit 'v2.6.39' into for-2.6.40/core

Since for-2.6.40/core was forked off the 2.6.39 devel tree, we've
had churn in the core area that makes it difficult to handle
patches for eg cfq or blk-throttle. Instead of requiring that they
be based in older versions with bugs that have been fixed later
in the rc cycle, merge in 2.6.39 final.

Also fixes up conflicts in the below files.

Conflicts:
	drivers/block/paride/pcd.c
	drivers/cdrom/viocd.c
	drivers/ide/ide-cd.c

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 24 insertions, 19 deletions

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 470dcda..83326ad 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1408,6 +1408,9 @@ out:
 	return ret;
 }
 
+#define VM_NO_THP (VM_SPECIAL|VM_INSERTPAGE|VM_MIXEDMAP|VM_SAO| \
+		   VM_HUGETLB|VM_SHARED|VM_MAYSHARE)
+
 int hugepage_madvise(struct vm_area_struct *vma,
 		     unsigned long *vm_flags, int advice)
 {
@@ -1416,11 +1419,7 @@ int hugepage_madvise(struct vm_area_struct *vma,
 		/*
 		 * Be somewhat over-protective like KSM for now!
 		 */
-		if (*vm_flags & (VM_HUGEPAGE |
-				 VM_SHARED   | VM_MAYSHARE   |
-				 VM_PFNMAP   | VM_IO      | VM_DONTEXPAND |
-				 VM_RESERVED | VM_HUGETLB | VM_INSERTPAGE |
-				 VM_MIXEDMAP | VM_SAO))
+		if (*vm_flags & (VM_HUGEPAGE | VM_NO_THP))
 			return -EINVAL;
 		*vm_flags &= ~VM_NOHUGEPAGE;
 		*vm_flags |= VM_HUGEPAGE;
@@ -1436,11 +1435,7 @@ int hugepage_madvise(struct vm_area_struct *vma,
 		/*
 		 * Be somewhat over-protective like KSM for now!
 		 */
-		if (*vm_flags & (VM_NOHUGEPAGE |
-				 VM_SHARED   | VM_MAYSHARE   |
-				 VM_PFNMAP   | VM_IO      | VM_DONTEXPAND |
-				 VM_RESERVED | VM_HUGETLB | VM_INSERTPAGE |
-				 VM_MIXEDMAP | VM_SAO))
+		if (*vm_flags & (VM_NOHUGEPAGE | VM_NO_THP))
 			return -EINVAL;
 		*vm_flags &= ~VM_HUGEPAGE;
 		*vm_flags |= VM_NOHUGEPAGE;
@@ -1574,10 +1569,14 @@ int khugepaged_enter_vma_merge(struct vm_area_struct *vma)
 		 * page fault if needed.
 		 */
 		return 0;
-	if (vma->vm_file || vma->vm_ops)
+	if (vma->vm_ops)
 		/* khugepaged not yet working on file or special mappings */
 		return 0;
-	VM_BUG_ON(is_linear_pfn_mapping(vma) || is_pfn_mapping(vma));
+	/*
+	 * If is_pfn_mapping() is true is_learn_pfn_mapping() must be
+	 * true too, verify it here.
+	 */
+	VM_BUG_ON(is_linear_pfn_mapping(vma) || vma->vm_flags & VM_NO_THP);
 	hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK;
 	hend = vma->vm_end & HPAGE_PMD_MASK;
 	if (hstart < hend)
@@ -1828,12 +1827,15 @@ static void collapse_huge_page(struct mm_struct *mm,
 	    (vma->vm_flags & VM_NOHUGEPAGE))
 		goto out;
 
-	/* VM_PFNMAP vmas may have vm_ops null but vm_file set */
-	if (!vma->anon_vma || vma->vm_ops || vma->vm_file)
+	if (!vma->anon_vma || vma->vm_ops)
 		goto out;
 	if (is_vma_temporary_stack(vma))
 		goto out;
-	VM_BUG_ON(is_linear_pfn_mapping(vma) || is_pfn_mapping(vma));
+	/*
+	 * If is_pfn_mapping() is true is_learn_pfn_mapping() must be
+	 * true too, verify it here.
+	 */
+	VM_BUG_ON(is_linear_pfn_mapping(vma) || vma->vm_flags & VM_NO_THP);
 
 	pgd = pgd_offset(mm, address);
 	if (!pgd_present(*pgd))
@@ -2066,13 +2068,16 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages,
 			progress++;
 			continue;
 		}
-		/* VM_PFNMAP vmas may have vm_ops null but vm_file set */
-		if (!vma->anon_vma || vma->vm_ops || vma->vm_file)
+		if (!vma->anon_vma || vma->vm_ops)
 			goto skip;
 		if (is_vma_temporary_stack(vma))
 			goto skip;
-
-		VM_BUG_ON(is_linear_pfn_mapping(vma) || is_pfn_mapping(vma));
+		/*
+		 * If is_pfn_mapping() is true is_learn_pfn_mapping()
+		 * must be true too, verify it here.
+		 */
+		VM_BUG_ON(is_linear_pfn_mapping(vma) ||
+			  vma->vm_flags & VM_NO_THP);
 
 		hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK;
 		hend = vma->vm_end & HPAGE_PMD_MASK;