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authorOleg Nesterov <oleg@redhat.com>2014-10-09 15:27:43 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-09 22:25:55 -0400
commitf15ca78e33b0bb5acc0c5d9a5d5be3c55c4f0bb7 (patch)
tree0fbf0b3ccedd33232dcd60d9f959509d4cc2cdf2 /mm
parent2386740d1add7bb5048c731dd1127a4e9911a3ed (diff)
downloadlinux-f15ca78e33b0bb5acc0c5d9a5d5be3c55c4f0bb7.tar.bz2
mempolicy: change get_task_policy() to return default_policy rather than NULL
Every caller of get_task_policy() falls back to default_policy if it returns NULL. Change get_task_policy() to do this. 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>
Diffstat (limited to 'mm')
-rw-r--r--mm/mempolicy.c31
1 files changed, 13 insertions, 18 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index c0c5d388046f..656db97584f0 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -126,22 +126,20 @@ static struct mempolicy preferred_node_policy[MAX_NUMNODES];
static struct mempolicy *get_task_policy(struct task_struct *p)
{
struct mempolicy *pol = p->mempolicy;
+ int node;
- if (!pol) {
- int node = numa_node_id();
+ if (pol)
+ return pol;
- if (node != NUMA_NO_NODE) {
- pol = &preferred_node_policy[node];
- /*
- * preferred_node_policy is not initialised early in
- * boot
- */
- if (!pol->mode)
- pol = NULL;
- }
+ node = numa_node_id();
+ if (node != NUMA_NO_NODE) {
+ pol = &preferred_node_policy[node];
+ /* preferred_node_policy is not initialised early in boot */
+ if (pol->mode)
+ return pol;
}
- return pol;
+ return &default_policy;
}
static const struct mempolicy_operations {
@@ -1644,14 +1642,14 @@ struct mempolicy *get_vma_policy(struct task_struct *task,
mpol_get(pol);
}
}
- if (!pol)
- pol = &default_policy;
+
return pol;
}
bool vma_policy_mof(struct task_struct *task, struct vm_area_struct *vma)
{
struct mempolicy *pol = get_task_policy(task);
+
if (vma) {
if (vma->vm_ops && vma->vm_ops->get_policy) {
bool ret = false;
@@ -1667,9 +1665,6 @@ bool vma_policy_mof(struct task_struct *task, struct vm_area_struct *vma)
}
}
- if (!pol)
- return default_policy.flags & MPOL_F_MOF;
-
return pol->flags & MPOL_F_MOF;
}
@@ -2077,7 +2072,7 @@ struct page *alloc_pages_current(gfp_t gfp, unsigned order)
struct page *page;
unsigned int cpuset_mems_cookie;
- if (!pol || in_interrupt() || (gfp & __GFP_THISNODE))
+ if (in_interrupt() || (gfp & __GFP_THISNODE))
pol = &default_policy;
retry_cpuset: