Merge commit 'v2.6.36-rc3' into x86/memblock

[cascardo/linux.git] / arch / powerpc / kernel / setup_64.c

diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 4360944..2a178b0 100644 (file)
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -95,7 +95,7 @@ int ucache_bsize;
 
 #ifdef CONFIG_SMP
 
-static int smt_enabled_cmdline;
+static char *smt_enabled_cmdline;
 
 /* Look for ibm,smt-enabled OF option */
 static void check_smt_enabled(void)
@@ -103,37 +103,46 @@ static void check_smt_enabled(void)
        struct device_node *dn;
        const char *smt_option;
 
-       /* Allow the command line to overrule the OF option */
-       if (smt_enabled_cmdline)
-               return;
-
-       dn = of_find_node_by_path("/options");
-
-       if (dn) {
-               smt_option = of_get_property(dn, "ibm,smt-enabled", NULL);
+       /* Default to enabling all threads */
+       smt_enabled_at_boot = threads_per_core;
 
-                if (smt_option) {
-                       if (!strcmp(smt_option, "on"))
-                               smt_enabled_at_boot = 1;
-                       else if (!strcmp(smt_option, "off"))
-                               smt_enabled_at_boot = 0;
-                }
-        }
+       /* Allow the command line to overrule the OF option */
+       if (smt_enabled_cmdline) {
+               if (!strcmp(smt_enabled_cmdline, "on"))
+                       smt_enabled_at_boot = threads_per_core;
+               else if (!strcmp(smt_enabled_cmdline, "off"))
+                       smt_enabled_at_boot = 0;
+               else {
+                       long smt;
+                       int rc;
+
+                       rc = strict_strtol(smt_enabled_cmdline, 10, &smt);
+                       if (!rc)
+                               smt_enabled_at_boot =
+                                       min(threads_per_core, (int)smt);
+               }
+       } else {
+               dn = of_find_node_by_path("/options");
+               if (dn) {
+                       smt_option = of_get_property(dn, "ibm,smt-enabled",
+                                                    NULL);
+
+                       if (smt_option) {
+                               if (!strcmp(smt_option, "on"))
+                                       smt_enabled_at_boot = threads_per_core;
+                               else if (!strcmp(smt_option, "off"))
+                                       smt_enabled_at_boot = 0;
+                       }
+
+                       of_node_put(dn);
+               }
+       }
 }
 
 /* Look for smt-enabled= cmdline option */
 static int __init early_smt_enabled(char *p)
 {
-       smt_enabled_cmdline = 1;
-
-       if (!p)
-               return 0;
-
-       if (!strcmp(p, "on") || !strcmp(p, "1"))
-               smt_enabled_at_boot = 1;
-       else if (!strcmp(p, "off") || !strcmp(p, "0"))
-               smt_enabled_at_boot = 0;
-
+       smt_enabled_cmdline = p;
        return 0;
 }
 early_param("smt-enabled", early_smt_enabled);
@@ -142,16 +151,6 @@ early_param("smt-enabled", early_smt_enabled);
 #define check_smt_enabled()
 #endif /* CONFIG_SMP */
 
-/* Put the paca pointer into r13 and SPRG_PACA */
-static void __init setup_paca(struct paca_struct *new_paca)
-{
-       local_paca = new_paca;
-       mtspr(SPRN_SPRG_PACA, local_paca);
-#ifdef CONFIG_PPC_BOOK3E
-       mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
-#endif
-}
-
 /*
  * Early initialization entry point. This is called by head.S
  * with MMU translation disabled. We rely on the "feature" of
@@ -390,8 +389,8 @@ void __init setup_system(void)
         */
        xmon_setup();
 
-       check_smt_enabled();
        smp_setup_cpu_maps();
+       check_smt_enabled();
 
 #ifdef CONFIG_SMP
        /* Release secondary cpus out of their spinloops at 0x60 now that
@@ -600,6 +599,9 @@ static int pcpu_cpu_distance(unsigned int from, unsigned int to)
                return REMOTE_DISTANCE;
 }
 
+unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
+EXPORT_SYMBOL(__per_cpu_offset);
+
 void __init setup_per_cpu_areas(void)
 {
        const size_t dyn_size = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
@@ -624,8 +626,10 @@ void __init setup_per_cpu_areas(void)
                panic("cannot initialize percpu area (err=%d)", rc);
 
        delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
-       for_each_possible_cpu(cpu)
-               paca[cpu].data_offset = delta + pcpu_unit_offsets[cpu];
+       for_each_possible_cpu(cpu) {
+                __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
+               paca[cpu].data_offset = __per_cpu_offset[cpu];
+       }
 }
 #endif