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-rw-r--r--include/linux/mm.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h
index bc0ad24cf8c..8b7f4a5d4f6 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -172,7 +172,25 @@ struct vm_operations_struct {
172 * writable, if an error is returned it will cause a SIGBUS */ 172 * writable, if an error is returned it will cause a SIGBUS */
173 int (*page_mkwrite)(struct vm_area_struct *vma, struct page *page); 173 int (*page_mkwrite)(struct vm_area_struct *vma, struct page *page);
174#ifdef CONFIG_NUMA 174#ifdef CONFIG_NUMA
175 /*
176 * set_policy() op must add a reference to any non-NULL @new mempolicy
177 * to hold the policy upon return. Caller should pass NULL @new to
178 * remove a policy and fall back to surrounding context--i.e. do not
179 * install a MPOL_DEFAULT policy, nor the task or system default
180 * mempolicy.
181 */
175 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); 182 int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
183
184 /*
185 * get_policy() op must add reference [mpol_get()] to any policy at
186 * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure
187 * in mm/mempolicy.c will do this automatically.
188 * get_policy() must NOT add a ref if the policy at (vma,addr) is not
189 * marked as MPOL_SHARED. vma policies are protected by the mmap_sem.
190 * If no [shared/vma] mempolicy exists at the addr, get_policy() op
191 * must return NULL--i.e., do not "fallback" to task or system default
192 * policy.
193 */
176 struct mempolicy *(*get_policy)(struct vm_area_struct *vma, 194 struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
177 unsigned long addr); 195 unsigned long addr);
178 int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from, 196 int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from,