[PATCH] sibling map initializing rework

Make sibling map init per-cpu.  Hotplug CPU may change the map at runtime.

Signed-off-by: Li Shaohua<shaohua.li@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c
index c5517f3..09b4ceb 100644 (file)
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -66,11 +66,21 @@ int smp_num_siblings = 1;
 #ifdef CONFIG_X86_HT
 EXPORT_SYMBOL(smp_num_siblings);
 #endif
-int phys_proc_id[NR_CPUS]; /* Package ID of each logical CPU */
+
+/* Package ID of each logical CPU */
+int phys_proc_id[NR_CPUS] = {[0 ... NR_CPUS-1] = BAD_APICID};
 EXPORT_SYMBOL(phys_proc_id);
-int cpu_core_id[NR_CPUS]; /* Core ID of each logical CPU */
+
+/* Core ID of each logical CPU */
+int cpu_core_id[NR_CPUS] = {[0 ... NR_CPUS-1] = BAD_APICID};
 EXPORT_SYMBOL(cpu_core_id);
 
+cpumask_t cpu_sibling_map[NR_CPUS];
+EXPORT_SYMBOL(cpu_sibling_map);
+
+cpumask_t cpu_core_map[NR_CPUS];
+EXPORT_SYMBOL(cpu_core_map);
+
 /* bitmap of online cpus */
 cpumask_t cpu_online_map;
 EXPORT_SYMBOL(cpu_online_map);
@@ -423,6 +433,38 @@ static void __init smp_callin(void)
 
 static int cpucount;
 
+static inline void
+set_cpu_sibling_map(int cpu)
+{
+       int i;
+
+       if (smp_num_siblings > 1) {
+               for (i = 0; i < NR_CPUS; i++) {
+                       if (!cpu_isset(i, cpu_callout_map))
+                               continue;
+                       if (cpu_core_id[cpu] == cpu_core_id[i]) {
+                               cpu_set(i, cpu_sibling_map[cpu]);
+                               cpu_set(cpu, cpu_sibling_map[i]);
+                       }
+               }
+       } else {
+               cpu_set(cpu, cpu_sibling_map[cpu]);
+       }
+
+       if (current_cpu_data.x86_num_cores > 1) {
+               for (i = 0; i < NR_CPUS; i++) {
+                       if (!cpu_isset(i, cpu_callout_map))
+                               continue;
+                       if (phys_proc_id[cpu] == phys_proc_id[i]) {
+                               cpu_set(i, cpu_core_map[cpu]);
+                               cpu_set(cpu, cpu_core_map[i]);
+                       }
+               }
+       } else {
+               cpu_core_map[cpu] = cpu_sibling_map[cpu];
+       }
+}
+
 /*
  * Activate a secondary processor.
  */
@@ -450,6 +492,10 @@ static void __init start_secondary(void *unused)
         */
        local_flush_tlb();
 
+       /* This must be done before setting cpu_online_map */
+       set_cpu_sibling_map(raw_smp_processor_id());
+       wmb();
+
        /*
         * We need to hold call_lock, so there is no inconsistency
         * between the time smp_call_function() determines number of
@@ -912,13 +958,6 @@ void *xquad_portio;
 EXPORT_SYMBOL(xquad_portio);
 #endif
 
-cpumask_t cpu_sibling_map[NR_CPUS] __cacheline_aligned;
-#ifdef CONFIG_X86_HT
-EXPORT_SYMBOL(cpu_sibling_map);
-#endif
-cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned;
-EXPORT_SYMBOL(cpu_core_map);
-
 static void __init smp_boot_cpus(unsigned int max_cpus)
 {
        int apicid, cpu, bit, kicked;
@@ -1082,44 +1121,8 @@ static void __init smp_boot_cpus(unsigned int max_cpus)
                cpus_clear(cpu_core_map[cpu]);
        }
 
-       for (cpu = 0; cpu < NR_CPUS; cpu++) {
-               struct cpuinfo_x86 *c = cpu_data + cpu;
-               int siblings = 0;
-               int i;
-               if (!cpu_isset(cpu, cpu_callout_map))
-                       continue;
-
-               if (smp_num_siblings > 1) {
-                       for (i = 0; i < NR_CPUS; i++) {
-                               if (!cpu_isset(i, cpu_callout_map))
-                                       continue;
-                               if (cpu_core_id[cpu] == cpu_core_id[i]) {
-                                       siblings++;
-                                       cpu_set(i, cpu_sibling_map[cpu]);
-                               }
-                       }
-               } else {
-                       siblings++;
-                       cpu_set(cpu, cpu_sibling_map[cpu]);
-               }
-
-               if (siblings != smp_num_siblings) {
-                       printk(KERN_WARNING "WARNING: %d siblings found for CPU%d, should be %d\n", siblings, cpu, smp_num_siblings);
-                       smp_num_siblings = siblings;
-               }
-
-               if (c->x86_num_cores > 1) {
-                       for (i = 0; i < NR_CPUS; i++) {
-                               if (!cpu_isset(i, cpu_callout_map))
-                                       continue;
-                               if (phys_proc_id[cpu] == phys_proc_id[i]) {
-                                       cpu_set(i, cpu_core_map[cpu]);
-                               }
-                       }
-               } else {
-                       cpu_core_map[cpu] = cpu_sibling_map[cpu];
-               }
-       }
+       cpu_set(0, cpu_sibling_map[0]);
+       cpu_set(0, cpu_core_map[0]);
 
        smpboot_setup_io_apic();