[PATCH] alpha: set cpu_possible_map much earlier

All the percpu data structure walkers want cpu_possible_map to be
initialized early, but alpha instead populated "hwrpb_cpu_present_mask"
early in setup_smp(), and then initialized cpu_possible_map only much
later.

Thanks go to Heiko Carstens and Dipankar Sarma for noticing.

This fixes it and we can get rid of hwrpb_cpu_present_mask entirely.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c
index 4b87352..02c2db0 100644 (file)
--- a/arch/alpha/kernel/smp.c
+++ b/arch/alpha/kernel/smp.c
@@ -73,9 +73,6 @@ cpumask_t cpu_online_map;
 
 EXPORT_SYMBOL(cpu_online_map);
 
-/* cpus reported in the hwrpb */
-static unsigned long hwrpb_cpu_present_mask __initdata = 0;
-
 int smp_num_probed;            /* Internal processor count */
 int smp_num_cpus = 1;          /* Number that came online.  */
 
@@ -442,7 +439,7 @@ setup_smp(void)
                        if ((cpu->flags & 0x1cc) == 0x1cc) {
                                smp_num_probed++;
                                /* Assume here that "whami" == index */
-                               hwrpb_cpu_present_mask |= (1UL << i);
+                               cpu_set(i, cpu_possible_map);
                                cpu->pal_revision = boot_cpu_palrev;
                        }
 
@@ -453,12 +450,12 @@ setup_smp(void)
                }
        } else {
                smp_num_probed = 1;
-               hwrpb_cpu_present_mask = (1UL << boot_cpuid);
+               cpu_set(boot_cpuid, cpu_possible_map);
        }
        cpu_present_mask = cpumask_of_cpu(boot_cpuid);
 
        printk(KERN_INFO "SMP: %d CPUs probed -- cpu_present_mask = %lx\n",
-              smp_num_probed, hwrpb_cpu_present_mask);
+              smp_num_probed, cpu_possible_map.bits[0]);
 }
 
 /*
@@ -467,8 +464,6 @@ setup_smp(void)
 void __init
 smp_prepare_cpus(unsigned int max_cpus)
 {
-       int cpu_count, i;
-
        /* Take care of some initial bookkeeping.  */
        memset(ipi_data, 0, sizeof(ipi_data));
 
@@ -486,19 +481,7 @@ smp_prepare_cpus(unsigned int max_cpus)
 
        printk(KERN_INFO "SMP starting up secondaries.\n");
 
-       cpu_count = 1;
-       for (i = 0; (i < NR_CPUS) && (cpu_count < max_cpus); i++) {
-               if (i == boot_cpuid)
-                       continue;
-
-               if (((hwrpb_cpu_present_mask >> i) & 1) == 0)
-                       continue;
-
-               cpu_set(i, cpu_possible_map);
-               cpu_count++;
-       }
-
-       smp_num_cpus = cpu_count;
+       smp_num_cpus = smp_num_probed;
 }
 
 void __devinit