sched: clean up sched_domain_debug()

clean up sched_domain_debug().

this also shrinks the code a bit:

   text    data     bss     dec     hex filename
  50474    4306     480   55260    d7dc sched.o.before
  50404    4306     480   55190    d796 sched.o.after

Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/sched.c b/kernel/sched.c
index 80edf29..af02a4d 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5617,101 +5617,101 @@ int nr_cpu_ids __read_mostly = NR_CPUS;
 EXPORT_SYMBOL(nr_cpu_ids);
 
 #ifdef CONFIG_SCHED_DEBUG
-static void sched_domain_debug(struct sched_domain *sd, int cpu)
+
+static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level)
 {
-       int level = 0;
+       struct sched_group *group = sd->groups;
+       cpumask_t groupmask;
+       char str[NR_CPUS];
 
-       if (!sd) {
-               printk(KERN_DEBUG "CPU%d attaching NULL sched-domain.\n", cpu);
-               return;
+       cpumask_scnprintf(str, NR_CPUS, sd->span);
+       cpus_clear(groupmask);
+
+       printk(KERN_DEBUG "%*s domain %d: ", level, "", level);
+
+       if (!(sd->flags & SD_LOAD_BALANCE)) {
+               printk("does not load-balance\n");
+               if (sd->parent)
+                       printk(KERN_ERR "ERROR: !SD_LOAD_BALANCE domain"
+                                       " has parent");
+               return -1;
        }
 
-       printk(KERN_DEBUG "CPU%d attaching sched-domain:\n", cpu);
+       printk(KERN_CONT "span %s\n", str);
+
+       if (!cpu_isset(cpu, sd->span)) {
+               printk(KERN_ERR "ERROR: domain->span does not contain "
+                               "CPU%d\n", cpu);
+       }
+       if (!cpu_isset(cpu, group->cpumask)) {
+               printk(KERN_ERR "ERROR: domain->groups does not contain"
+                               " CPU%d\n", cpu);
+       }
 
+       printk(KERN_DEBUG "%*s groups:", level + 1, "");
        do {
-               int i;
-               char str[NR_CPUS];
-               struct sched_group *group = sd->groups;
-               cpumask_t groupmask;
-
-               cpumask_scnprintf(str, NR_CPUS, sd->span);
-               cpus_clear(groupmask);
-
-               printk(KERN_DEBUG);
-               for (i = 0; i < level + 1; i++)
-                       printk(" ");
-               printk("domain %d: ", level);
-
-               if (!(sd->flags & SD_LOAD_BALANCE)) {
-                       printk("does not load-balance\n");
-                       if (sd->parent)
-                               printk(KERN_ERR "ERROR: !SD_LOAD_BALANCE domain"
-                                               " has parent");
+               if (!group) {
+                       printk("\n");
+                       printk(KERN_ERR "ERROR: group is NULL\n");
                        break;
                }
 
-               printk("span %s\n", str);
+               if (!group->__cpu_power) {
+                       printk(KERN_CONT "\n");
+                       printk(KERN_ERR "ERROR: domain->cpu_power not "
+                                       "set\n");
+                       break;
+               }
 
-               if (!cpu_isset(cpu, sd->span))
-                       printk(KERN_ERR "ERROR: domain->span does not contain "
-                                       "CPU%d\n", cpu);
-               if (!cpu_isset(cpu, group->cpumask))
-                       printk(KERN_ERR "ERROR: domain->groups does not contain"
-                                       " CPU%d\n", cpu);
+               if (!cpus_weight(group->cpumask)) {
+                       printk(KERN_CONT "\n");
+                       printk(KERN_ERR "ERROR: empty group\n");
+                       break;
+               }
 
-               printk(KERN_DEBUG);
-               for (i = 0; i < level + 2; i++)
-                       printk(" ");
-               printk("groups:");
-               do {
-                       if (!group) {
-                               printk("\n");
-                               printk(KERN_ERR "ERROR: group is NULL\n");
-                               break;
-                       }
+               if (cpus_intersects(groupmask, group->cpumask)) {
+                       printk(KERN_CONT "\n");
+                       printk(KERN_ERR "ERROR: repeated CPUs\n");
+                       break;
+               }
 
-                       if (!group->__cpu_power) {
-                               printk(KERN_CONT "\n");
-                               printk(KERN_ERR "ERROR: domain->cpu_power not "
-                                               "set\n");
-                               break;
-                       }
+               cpus_or(groupmask, groupmask, group->cpumask);
 
-                       if (!cpus_weight(group->cpumask)) {
-                               printk(KERN_CONT "\n");
-                               printk(KERN_ERR "ERROR: empty group\n");
-                               break;
-                       }
+               cpumask_scnprintf(str, NR_CPUS, group->cpumask);
+               printk(KERN_CONT " %s", str);
 
-                       if (cpus_intersects(groupmask, group->cpumask)) {
-                               printk(KERN_CONT "\n");
-                               printk(KERN_ERR "ERROR: repeated CPUs\n");
-                               break;
-                       }
+               group = group->next;
+       } while (group != sd->groups);
+       printk(KERN_CONT "\n");
 
-                       cpus_or(groupmask, groupmask, group->cpumask);
+       if (!cpus_equal(sd->span, groupmask))
+               printk(KERN_ERR "ERROR: groups don't span domain->span\n");
 
-                       cpumask_scnprintf(str, NR_CPUS, group->cpumask);
-                       printk(KERN_CONT " %s", str);
+       if (sd->parent && !cpus_subset(groupmask, sd->parent->span))
+               printk(KERN_ERR "ERROR: parent span is not a superset "
+                       "of domain->span\n");
+       return 0;
+}
 
-                       group = group->next;
-               } while (group != sd->groups);
-               printk(KERN_CONT "\n");
+static void sched_domain_debug(struct sched_domain *sd, int cpu)
+{
+       int level = 0;
 
-               if (!cpus_equal(sd->span, groupmask))
-                       printk(KERN_ERR "ERROR: groups don't span "
-                                       "domain->span\n");
+       if (!sd) {
+               printk(KERN_DEBUG "CPU%d attaching NULL sched-domain.\n", cpu);
+               return;
+       }
 
+       printk(KERN_DEBUG "CPU%d attaching sched-domain:\n", cpu);
+
+       for (;;) {
+               if (sched_domain_debug_one(sd, cpu, level))
+                       break;
                level++;
                sd = sd->parent;
                if (!sd)
-                       continue;
-
-               if (!cpus_subset(groupmask, sd->span))
-                       printk(KERN_ERR "ERROR: parent span is not a superset "
-                               "of domain->span\n");
-
-       } while (sd);
+                       break;
+       }
 }
 #else
 # define sched_domain_debug(sd, cpu) do { } while (0)