[PATCH v3 06/13] pagemap: use walk->vma instead of calling find_vma()

[Naoya Horiguchi]

Page table walker has the information of the current vma in mm_walk, so
we don't have to call find_vma() in each pagemap_hugetlb_range() call.

NULL-vma check is omitted because we assume that we never run hugetlb_entry()
callback on the address without vma. And even if it were broken, null pointer
dereference would be detected, so we can get enough information for debugging.

Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
---
 fs/proc/task_mmu.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git v3.16-rc1.orig/fs/proc/task_mmu.c v3.16-rc1/fs/proc/task_mmu.c
index 3c42cd40ad36..74f87794afab 100644
--- v3.16-rc1.orig/fs/proc/task_mmu.c
+++ v3.16-rc1/fs/proc/task_mmu.c
@@ -1082,15 +1082,12 @@ static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask,
 				 struct mm_walk *walk)
 {
 	struct pagemapread *pm = walk->private;
-	struct vm_area_struct *vma;
+	struct vm_area_struct *vma = walk->vma;
 	int err = 0;
 	int flags2;
 	pagemap_entry_t pme;
 
-	vma = find_vma(walk->mm, addr);
-	WARN_ON_ONCE(!vma);
-
-	if (vma && (vma->vm_flags & VM_SOFTDIRTY))
+	if (vma->vm_flags & VM_SOFTDIRTY)
 		flags2 = __PM_SOFT_DIRTY;
 	else
 		flags2 = 0;
-- 
1.9.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/