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mempolicy: introduce __get_vma_policy(), export get_task_policy()

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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 <[email protected]>
Cc: KAMEZAWA Hiroyuki <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: KOSAKI Motohiro <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Cyrill Gorcunov <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Oleg Nesterov 2014-10-09 15:27:50 -07:00 • committed by Linus Torvalds
commit 74d2c3a05c
2 changed files with 29 additions and 18 deletions
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44
mm/mempolicy.c
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@ -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);