x86, apic: Clean up bigsmp apic selection code

Make generic_bigsmp_probe() return struct apic *. This will
avoid exporting apic_bigsmp, which will be consistent with
others.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Tested-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: steiner@sgi.com
Cc: gorcunov@openvz.org
Cc: yinghai@kernel.org
Link: http://lkml.kernel.org/r/20110521005526.252703851@sbsiddha-MOBL3.sc.intel.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 80b243c..f37703d 100644 (file)
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -500,7 +500,7 @@ static inline void default_wait_for_init_deassert(atomic_t *deassert)
        return;
 }
 
-extern void generic_bigsmp_probe(void);
+extern struct apic *generic_bigsmp_probe(void);
 
 
 #ifdef CONFIG_X86_LOCAL_APIC

diff --git a/arch/x86/kernel/apic/bigsmp_32.c b/arch/x86/kernel/apic/bigsmp_32.c
index cfb13c3..479a06c 100644 (file)
--- a/arch/x86/kernel/apic/bigsmp_32.c
+++ b/arch/x86/kernel/apic/bigsmp_32.c
@@ -255,4 +255,12 @@ struct apic apic_bigsmp = {
        .x86_32_early_logical_apicid    = bigsmp_early_logical_apicid,
 };
 
+struct apic * __init generic_bigsmp_probe(void)
+{
+       if (probe_bigsmp())
+               return &apic_bigsmp;
+
+       return NULL;
+}
+
 apic_driver(apic_bigsmp);

diff --git a/arch/x86/kernel/apic/probe_32.c b/arch/x86/kernel/apic/probe_32.c
index 8796e1d..c81756d 100644 (file)
--- a/arch/x86/kernel/apic/probe_32.c
+++ b/arch/x86/kernel/apic/probe_32.c
@@ -52,31 +52,6 @@ static int __init print_ipi_mode(void)
 }
 late_initcall(print_ipi_mode);
 
-void __init default_setup_apic_routing(void)
-{
-       int version = apic_version[boot_cpu_physical_apicid];
-
-       if (num_possible_cpus() > 8) {
-               switch (boot_cpu_data.x86_vendor) {
-               case X86_VENDOR_INTEL:
-                       if (!APIC_XAPIC(version)) {
-                               def_to_bigsmp = 0;
-                               break;
-                       }
-                       /* If P4 and above fall through */
-               case X86_VENDOR_AMD:
-                       def_to_bigsmp = 1;
-               }
-       }
-
-#ifdef CONFIG_X86_BIGSMP
-       generic_bigsmp_probe();
-#endif
-
-       if (apic->setup_apic_routing)
-               apic->setup_apic_routing();
-}
-
 static int default_x86_32_early_logical_apicid(int cpu)
 {
        return 1 << cpu;
@@ -224,24 +199,43 @@ static int __init parse_apic(char *arg)
 }
 early_param("apic", parse_apic);
 
-void __init generic_bigsmp_probe(void)
+void __init default_setup_apic_routing(void)
 {
+       int version = apic_version[boot_cpu_physical_apicid];
+
+       if (num_possible_cpus() > 8) {
+               switch (boot_cpu_data.x86_vendor) {
+               case X86_VENDOR_INTEL:
+                       if (!APIC_XAPIC(version)) {
+                               def_to_bigsmp = 0;
+                               break;
+                       }
+                       /* If P4 and above fall through */
+               case X86_VENDOR_AMD:
+                       def_to_bigsmp = 1;
+               }
+       }
+
 #ifdef CONFIG_X86_BIGSMP
        /*
-        * This routine is used to switch to bigsmp mode when
+        * This is used to switch to bigsmp mode when
         * - There is no apic= option specified by the user
         * - generic_apic_probe() has chosen apic_default as the sub_arch
         * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
         */
 
        if (!cmdline_apic && apic == &apic_default) {
-               if (apic_bigsmp.probe()) {
-                       apic = &apic_bigsmp;
+               struct apic *bigsmp = generic_bigsmp_probe();
+               if (bigsmp) {
+                       apic = bigsmp;
                        printk(KERN_INFO "Overriding APIC driver with %s\n",
                               apic->name);
                }
        }
 #endif
+
+       if (apic->setup_apic_routing)
+               apic->setup_apic_routing();
 }
 
 void __init generic_apic_probe(void)