diff options
Diffstat (limited to 'include/linux/mempolicy.h')
| -rw-r--r-- | include/linux/mempolicy.h | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h index 69160dc32d4..b8b3da7a331 100644 --- a/include/linux/mempolicy.h +++ b/include/linux/mempolicy.h @@ -54,19 +54,20 @@ struct mm_struct; * 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 */ @@ -151,7 +152,8 @@ extern void mpol_fix_fork_child_flag(struct task_struct *p); 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; @@ -239,8 +241,11 @@ static inline void mpol_fix_fork_child_flag(struct task_struct *p) } 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); } |