access_process_vm device memory infrastructure

[pandora-kernel.git] / include / asm-x86 / topology.h

diff --git a/include/asm-x86/topology.h b/include/asm-x86/topology.h
index 1f97758..90ac771 100644 (file)
--- a/include/asm-x86/topology.h
+++ b/include/asm-x86/topology.h
@@ -57,7 +57,12 @@ static inline int cpu_to_node(int cpu)
 }
 #define early_cpu_to_node(cpu) cpu_to_node(cpu)
 
-/* Returns a bitmask of CPUs on Node 'node'. */
+/* Returns a bitmask of CPUs on Node 'node'.
+ *
+ * Side note: this function creates the returned cpumask on the stack
+ * so with a high NR_CPUS count, excessive stack space is used.  The
+ * node_to_cpumask_ptr function should be used whenever possible.
+ */
 static inline cpumask_t node_to_cpumask(int node)
 {
        return node_to_cpumask_map[node];
@@ -77,7 +82,7 @@ DECLARE_EARLY_PER_CPU(int, x86_cpu_to_node_map);
 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
 extern int cpu_to_node(int cpu);
 extern int early_cpu_to_node(int cpu);
-extern cpumask_t *_node_to_cpumask_ptr(int node);
+extern const cpumask_t *_node_to_cpumask_ptr(int node);
 extern cpumask_t node_to_cpumask(int node);
 
 #else  /* !CONFIG_DEBUG_PER_CPU_MAPS */
@@ -98,7 +103,7 @@ static inline int early_cpu_to_node(int cpu)
 }
 
 /* Returns a pointer to the cpumask of CPUs on Node 'node'. */
-static inline cpumask_t *_node_to_cpumask_ptr(int node)
+static inline const cpumask_t *_node_to_cpumask_ptr(int node)
 {
        return &node_to_cpumask_map[node];
 }
@@ -113,7 +118,7 @@ static inline cpumask_t node_to_cpumask(int node)
 
 /* Replace default node_to_cpumask_ptr with optimized version */
 #define node_to_cpumask_ptr(v, node)           \
-               cpumask_t *v = _node_to_cpumask_ptr(node)
+               const cpumask_t *v = _node_to_cpumask_ptr(node)
 
 #define node_to_cpumask_ptr_next(v, node)      \
                           v = _node_to_cpumask_ptr(node)
@@ -181,7 +186,7 @@ extern int __node_distance(int, int);
 #define        cpu_to_node(cpu)        0
 #define        early_cpu_to_node(cpu)  0
 
-static inline cpumask_t *_node_to_cpumask_ptr(int node)
+static inline const cpumask_t *_node_to_cpumask_ptr(int node)
 {
        return &cpu_online_map;
 }
@@ -196,7 +201,7 @@ static inline int node_to_first_cpu(int node)
 
 /* Replace default node_to_cpumask_ptr with optimized version */
 #define node_to_cpumask_ptr(v, node)           \
-               cpumask_t *v = _node_to_cpumask_ptr(node)
+               const cpumask_t *v = _node_to_cpumask_ptr(node)
 
 #define node_to_cpumask_ptr_next(v, node)      \
                           v = _node_to_cpumask_ptr(node)