[PATCH] cpuset: mempolicy one more nodemask conversion

Finish converting mm/mempolicy.c from bitmaps to nodemasks.  The previous
conversion had left one routine using bitmaps, since it involved a
corresponding change to kernel/cpuset.c

Fix that interface by replacing with a simple macro that calls nodes_subset(),
or if !CONFIG_CPUSET, returns (1).
Signed-off-by: Paul Jackson <pj@sgi.com>
Cc: Christoph Lameter <christoph@lameter.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/cpuset.h

@@ -21,7 +21,8 @@ extern void cpuset_exit(struct task_struct *p);
 extern cpumask_t cpuset_cpus_allowed(const struct task_struct *p);
 void cpuset_init_current_mems_allowed(void);
 void cpuset_update_current_mems_allowed(void);
-void cpuset_restrict_to_mems_allowed(unsigned long *nodes);
+#define cpuset_nodes_subset_current_mems_allowed(nodes) \
+		nodes_subset((nodes), current->mems_allowed)
 int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl);
 extern int cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask);
 extern int cpuset_excl_nodes_overlap(const struct task_struct *p);
@@ -42,7 +43,7 @@ static inline cpumask_t cpuset_cpus_allowed(struct task_struct *p)
 
 static inline void cpuset_init_current_mems_allowed(void) {}
 static inline void cpuset_update_current_mems_allowed(void) {}
-static inline void cpuset_restrict_to_mems_allowed(unsigned long *nodes) {}
+#define cpuset_nodes_subset_current_mems_allowed(nodes) (1)
 
 static inline int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl)
 {

kernel/cpuset.c

@@ -1749,16 +1749,6 @@ done:
 		refresh_mems();
 }
 
-/**
- * cpuset_restrict_to_mems_allowed - limit nodes to current mems_allowed
- * @nodes: pointer to a node bitmap that is and-ed with mems_allowed
- */
-void cpuset_restrict_to_mems_allowed(unsigned long *nodes)
-{
-	bitmap_and(nodes, nodes, nodes_addr(current->mems_allowed),
-							MAX_NUMNODES);
-}
-
 /**
  * cpuset_zonelist_valid_mems_allowed - check zonelist vs. curremt mems_allowed
  * @zl: the zonelist to be checked

mm/mempolicy.c

@@ -387,10 +387,9 @@ static int contextualize_policy(int mode, nodemask_t *nodes)
 	if (!nodes)
 		return 0;
 
-	/* Update current mems_allowed */
 	cpuset_update_current_mems_allowed();
-	/* Ignore nodes not set in current->mems_allowed */
-	cpuset_restrict_to_mems_allowed(nodes->bits);
+	if (!cpuset_nodes_subset_current_mems_allowed(*nodes))
+		return -EINVAL;
 	return mpol_check_policy(mode, nodes);
 }