[RFC][PATCH 21/26] mm, mpol: Introduce vma_put_policy()

[Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>]

In preparation of other changes, create a new interface so that we can
later extend its behaviour without having to touch all these sites.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
---
 include/linux/mempolicy.h |    5 +++++
 mm/mempolicy.c            |    5 +++++
 mm/mmap.c                 |    8 ++++----
 3 files changed, 14 insertions(+), 4 deletions(-)

--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -169,6 +169,7 @@ static inline struct mempolicy *mpol_dup
 #define vma_set_policy(vma, pol) ((vma)->vm_policy = (pol))
 
 extern int vma_dup_policy(struct vm_area_struct *new, struct vm_area_struct *old);
+extern void vma_put_policy(struct vm_area_struct *vma);
 
 static inline void mpol_get(struct mempolicy *pol)
 {
@@ -315,6 +316,10 @@ mpol_shared_policy_lookup(struct shared_
 #define vma_set_policy(vma, pol) do {} while(0)
 #define vma_dup_policy(new, old) (0)
 
+static inline void vma_put_policy(struct vm_area_struct *)
+{
+}
+
 static inline void numa_policy_init(void)
 {
 }
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1982,6 +1982,11 @@ int vma_dup_policy(struct vm_area_struct
 	return 0;
 }
 
+void vma_put_policy(struct vm_area_struct *vma)
+{
+	mpol_put(vma_policy(vma));
+}
+
 /*
  * If *frompol needs [has] an extra ref, copy *frompol to *tompol ,
  * eliminate the * MPOL_F_* flags that require conditional ref and
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -236,7 +236,7 @@ static struct vm_area_struct *remove_vma
 		if (vma->vm_flags & VM_EXECUTABLE)
 			removed_exe_file_vma(vma->vm_mm);
 	}
-	mpol_put(vma_policy(vma));
+	vma_put_policy(vma);
 	kmem_cache_free(vm_area_cachep, vma);
 	return next;
 }
@@ -633,7 +633,7 @@ again:			remove_next = 1 + (end > next->
 		if (next->anon_vma)
 			anon_vma_merge(vma, next);
 		mm->map_count--;
-		mpol_put(vma_policy(next));
+		vma_put_policy(next);
 		kmem_cache_free(vm_area_cachep, next);
 		/*
 		 * In mprotect's case 6 (see comments on vma_merge),
@@ -1994,7 +1994,7 @@ static int __split_vma(struct mm_struct
 	}
 	unlink_anon_vmas(new);
  out_free_mpol:
-	mpol_put(new->vm_policy);
+	vma_put_policy(new);
  out_free_vma:
 	kmem_cache_free(vm_area_cachep, new);
  out_err:
@@ -2392,7 +2392,7 @@ struct vm_area_struct *copy_vma(struct v
 	return new_vma;
 
  out_free_mempol:
-	mpol_put(new_vma->vm_policy);
+	vma_put_policy(new_vma);
  out_free_vma:
 	kmem_cache_free(vm_area_cachep, new_vma);
 	return NULL;


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