* mmap_sem.
*
* Freeing policy:
- * When policy is MPOL_BIND v.zonelist is kmalloc'ed and must be kfree'd.
- * All other policies don't have any external state. mpol_free() handles this.
+ * Mempolicy objects are reference counted. A mempolicy will be freed when
+ * mpol_free() decrements the reference count to zero.
*
* Copying policy objects:
- * For MPOL_BIND the zonelist must be always duplicated. mpol_clone() does this.
+ * mpol_copy() allocates a new mempolicy and copies the specified mempolicy
+ * to the new storage. The reference count of the new object is initialized
+ * to 1, representing the caller of mpol_copy().
*/
struct mempolicy {
atomic_t refcnt;
short policy; /* See MPOL_* above */
union {
- struct zonelist *zonelist; /* bind */
short preferred_node; /* preferred */
- nodemask_t nodes; /* interleave */
+ nodemask_t nodes; /* interleave/bind */
/* undefined for default */
} v;
nodemask_t cpuset_mems_allowed; /* mempolicy relative to these nodes */
extern struct mempolicy default_policy;
extern struct zonelist *huge_zonelist(struct vm_area_struct *vma,
- unsigned long addr, gfp_t gfp_flags, struct mempolicy **mpol);
+ unsigned long addr, gfp_t gfp_flags,
+ struct mempolicy **mpol, nodemask_t **nodemask);
extern unsigned slab_node(struct mempolicy *policy);
extern enum zone_type policy_zone;
}
static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma,
- unsigned long addr, gfp_t gfp_flags, struct mempolicy **mpol)
+ unsigned long addr, gfp_t gfp_flags,
+ struct mempolicy **mpol, nodemask_t **nodemask)
{
+ *mpol = NULL;
+ *nodemask = NULL;
return node_zonelist(0, gfp_flags);
}