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authorOleg Nesterov <oleg@redhat.com>2014-10-09 15:27:50 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-09 22:25:56 -0400
commit74d2c3a05cc6c1eef2d7236a9919036ed85ddaaf (patch)
tree85a5e82ac19e79cf72532d8be5f39ff91de56860
parent6b6482bbf64ef6f6dbc8b52f7a7cf88a0498bd51 (diff)
mempolicy: introduce __get_vma_policy(), export get_task_policy()
Extract the code which looks for vma's policy from get_vma_policy() into the new helper, __get_vma_policy(). Export get_task_policy(). Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Hugh Dickins <hughd@google.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/mempolicy.h3
-rw-r--r--mm/mempolicy.c44
2 files changed, 29 insertions, 18 deletions
diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index 5e4bfcedd2ce..e1abe249892a 100644
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -134,6 +134,9 @@ void mpol_free_shared_policy(struct shared_policy *p);
struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
unsigned long idx);
+struct mempolicy *get_task_policy(struct task_struct *p);
+struct mempolicy *__get_vma_policy(struct vm_area_struct *vma,
+ unsigned long addr);
struct mempolicy *get_vma_policy(struct task_struct *tsk,
struct vm_area_struct *vma, unsigned long addr);
bool vma_policy_mof(struct vm_area_struct *vma);
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index ad27bbc757bf..4378c334e89b 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -123,7 +123,7 @@ static struct mempolicy default_policy = {
static struct mempolicy preferred_node_policy[MAX_NUMNODES];
-static struct mempolicy *get_task_policy(struct task_struct *p)
+struct mempolicy *get_task_policy(struct task_struct *p)
{
struct mempolicy *pol = p->mempolicy;
int node;
@@ -1603,23 +1603,8 @@ COMPAT_SYSCALL_DEFINE6(mbind, compat_ulong_t, start, compat_ulong_t, len,
#endif
-/*
- * get_vma_policy(@task, @vma, @addr)
- * @task: task for fallback if vma policy == default
- * @vma: virtual memory area whose policy is sought
- * @addr: address in @vma for shared policy lookup
- *
- * 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 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
- * extra reference for shared policies.
- */
-struct mempolicy *get_vma_policy(struct task_struct *task,
- struct vm_area_struct *vma, unsigned long addr)
+struct mempolicy *__get_vma_policy(struct vm_area_struct *vma,
+ unsigned long addr)
{
struct mempolicy *pol = NULL;
@@ -1640,6 +1625,29 @@ struct mempolicy *get_vma_policy(struct task_struct *task,
}
}
+ return pol;
+}
+
+/*
+ * get_vma_policy(@task, @vma, @addr)
+ * @task: task for fallback if vma policy == default
+ * @vma: virtual memory area whose policy is sought
+ * @addr: address in @vma for shared policy lookup
+ *
+ * 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 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
+ * extra reference for shared policies.
+ */
+struct mempolicy *get_vma_policy(struct task_struct *task,
+ struct vm_area_struct *vma, unsigned long addr)
+{
+ struct mempolicy *pol = __get_vma_policy(vma, addr);
+
if (!pol)
pol = get_task_policy(task);