sched: properly define the sched_group::cpumask and sched_domain::span fields

[safe/jmp/linux-2.6] / include / linux / sched.h

diff --git a/include/linux/sched.h b/include/linux/sched.h
index de7b3b2..dbb1043 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -839,7 +839,17 @@ struct sched_group {
         */
        u32 reciprocal_cpu_power;
 
-       unsigned long cpumask[];
+       /*
+        * The CPUs this group covers.
+        *
+        * NOTE: this field is variable length. (Allocated dynamically
+        * by attaching extra space to the end of the structure,
+        * depending on how many CPUs the kernel has booted up with)
+        *
+        * It is also be embedded into static data structures at build
+        * time. (See 'struct static_sched_group' in kernel/sched.c)
+        */
+       unsigned long cpumask[0];
 };
 
 static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
@@ -925,8 +935,17 @@ struct sched_domain {
        char *name;
 #endif
 
-       /* span of all CPUs in this domain */
-       unsigned long span[];
+       /*
+        * Span of all CPUs in this domain.
+        *
+        * NOTE: this field is variable length. (Allocated dynamically
+        * by attaching extra space to the end of the structure,
+        * depending on how many CPUs the kernel has booted up with)
+        *
+        * It is also be embedded into static data structures at build
+        * time. (See 'struct static_sched_domain' in kernel/sched.c)
+        */
+       unsigned long span[0];
 };
 
 static inline struct cpumask *sched_domain_span(struct sched_domain *sd)