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authorDavid Rientjes <rientjes@google.com>2008-04-28 02:12:23 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 08:58:19 -0700
commita3b51e0142d1be156ac697eaadadd6cfbb7ba32b (patch)
treeda9e527316f112c09f0bc16553c64e3c87125c82 /include/linux/mempolicy.h
parent1b27d05b6e21249d2338be26dfcbe8f8d8ff8a5b (diff)
mempolicy: convert MPOL constants to enum
The mempolicy mode constants, MPOL_DEFAULT, MPOL_PREFERRED, MPOL_BIND, and MPOL_INTERLEAVE, are better declared as part of an enum since they are sequentially numbered and cannot be combined. The policy member of struct mempolicy is also converted from type short to type unsigned short. A negative policy does not have any legitimate meaning, so it is possible to change its type in preparation for adding optional mode flags later. The equivalent member of struct shmem_sb_info is also changed from int to unsigned short. For compatibility, the policy formal to get_mempolicy() remains as a pointer to an int: int get_mempolicy(int *policy, unsigned long *nmask, unsigned long maxnode, unsigned long addr, unsigned long flags); although the only possible values is the range of type unsigned short. Cc: Paul Jackson <pj@sgi.com> Cc: Christoph Lameter <clameter@sgi.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mempolicy.h')
-rw-r--r--include/linux/mempolicy.h19
1 files changed, 10 insertions, 9 deletions
diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index b8b3da7a331..389a06e8ee2 100644
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -9,12 +9,13 @@
*/
/* Policies */
-#define MPOL_DEFAULT 0
-#define MPOL_PREFERRED 1
-#define MPOL_BIND 2
-#define MPOL_INTERLEAVE 3
-
-#define MPOL_MAX MPOL_INTERLEAVE
+enum {
+ MPOL_DEFAULT,
+ MPOL_PREFERRED,
+ MPOL_BIND,
+ MPOL_INTERLEAVE,
+ MPOL_MAX, /* always last member of enum */
+};
/* Flags for get_mem_policy */
#define MPOL_F_NODE (1<<0) /* return next IL mode instead of node mask */
@@ -64,7 +65,7 @@ struct mm_struct;
*/
struct mempolicy {
atomic_t refcnt;
- short policy; /* See MPOL_* above */
+ unsigned short policy; /* See MPOL_* above */
union {
short preferred_node; /* preferred */
nodemask_t nodes; /* interleave/bind */
@@ -134,7 +135,7 @@ struct shared_policy {
spinlock_t lock;
};
-void mpol_shared_policy_init(struct shared_policy *info, int policy,
+void mpol_shared_policy_init(struct shared_policy *info, unsigned short policy,
nodemask_t *nodes);
int mpol_set_shared_policy(struct shared_policy *info,
struct vm_area_struct *vma,
@@ -202,7 +203,7 @@ static inline int mpol_set_shared_policy(struct shared_policy *info,
}
static inline void mpol_shared_policy_init(struct shared_policy *info,
- int policy, nodemask_t *nodes)
+ unsigned short policy, nodemask_t *nodes)
{
}