---

yaml
---
r: 334351
b: refs/heads/master
c: 32f8516
h: refs/heads/master
i:
  334349: bc6cff1
  334347: b95be3f
  334343: 74aa6c8
  334335: 5a91003
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: dd8e8c4a2c902d8350b702e7bc7c2799e5e7e331
+refs/heads/master: 32f8516a8c733d281faa9f6666b509035246505c

trunk/fs/proc/task_mmu.c

@@ -1158,6 +1158,7 @@ static int show_numa_map(struct seq_file *m, void *v, int is_pid)
 	struct vm_area_struct *vma = v;
 	struct numa_maps *md = &numa_priv->md;
 	struct file *file = vma->vm_file;
+	struct task_struct *task = proc_priv->task;
 	struct mm_struct *mm = vma->vm_mm;
 	struct mm_walk walk = {};
 	struct mempolicy *pol;
@@ -1177,9 +1178,11 @@ static int show_numa_map(struct seq_file *m, void *v, int is_pid)
 	walk.private = md;
 	walk.mm = mm;
 
-	pol = get_vma_policy(proc_priv->task, vma, vma->vm_start);
+	task_lock(task);
+	pol = get_vma_policy(task, vma, vma->vm_start);
 	mpol_to_str(buffer, sizeof(buffer), pol, 0);
 	mpol_cond_put(pol);
+	task_unlock(task);
 
 	seq_printf(m, "%08lx %s", vma->vm_start, buffer);
 
@@ -1189,7 +1192,7 @@ static int show_numa_map(struct seq_file *m, void *v, int is_pid)
 	} else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
 		seq_printf(m, " heap");
 	} else {
-		pid_t tid = vm_is_stack(proc_priv->task, vma, is_pid);
+		pid_t tid = vm_is_stack(task, vma, is_pid);
 		if (tid != 0) {
 			/*
 			 * Thread stack in /proc/PID/task/TID/maps or

trunk/mm/mempolicy.c

@@ -1536,9 +1536,8 @@ asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
  *
  * Returns effective policy for a VMA at specified address.
  * Falls back to @task or system default policy, as necessary.
- * Current or other task's task mempolicy and non-shared vma policies
- * are protected by the task's mmap_sem, which must be held for read by
- * the caller.
+ * Current or other task's task mempolicy and non-shared vma policies must be
+ * protected by task_lock(task) by the caller.
  * Shared policies [those marked as MPOL_F_SHARED] require an extra reference
  * count--added by the get_policy() vm_op, as appropriate--to protect against
  * freeing by another task.  It is the caller's responsibility to free the