pagemap: set pagemap walk limit to PMD boundary

[platform/adaptation/renesas_rcar/renesas_kernel.git] / fs / proc / task_mmu.c

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index da6b01d..c126c83 100644 (file)
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -706,6 +706,7 @@ static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask,
  * skip over unmapped regions.
  */
 #define PAGEMAP_WALK_SIZE      (PMD_SIZE)
+#define PAGEMAP_WALK_MASK      (PMD_MASK)
 static ssize_t pagemap_read(struct file *file, char __user *buf,
                            size_t count, loff_t *ppos)
 {
@@ -776,7 +777,7 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
                unsigned long end;
 
                pm.pos = 0;
-               end = start_vaddr + PAGEMAP_WALK_SIZE;
+               end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK;
                /* overflow ? */
                if (end < start_vaddr || end > end_vaddr)
                        end = end_vaddr;