diff options
-rw-r--r-- | include/linux/mm.h | 18 |
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, |