[patch 3/4] x86, apic: cleanup bigsmp apic selection code

Suresh Siddha
2011-05-21T00:59:34Z

[-- Attachment #1: cleanup_generic_bigsmp_probe.patch --]
[-- Type: text/plain, Size: 3478 bytes --]

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>
---
arch/x86/include/asm/apic.h | 2 -
arch/x86/kernel/apic/bigsmp_32.c | 8 ++++++
arch/x86/kernel/apic/probe_32.c | 52 +++++++++++++++++----------------------
3 files changed, 32 insertions(+), 30 deletions(-)

Index: linux-2.6-tip/arch/x86/include/asm/apic.h
===================================================================
--- linux-2.6-tip.orig/arch/x86/include/asm/apic.h
+++ linux-2.6-tip/arch/x86/include/asm/apic.h
@@ -500,7 +500,7 @@ static inline void default_wait_for_init
return;
}

-extern void generic_bigsmp_probe(void);
+extern struct apic *generic_bigsmp_probe(void);

#ifdef CONFIG_X86_LOCAL_APIC
Index: linux-2.6-tip/arch/x86/kernel/apic/bigsmp_32.c
===================================================================
--- linux-2.6-tip.orig/arch/x86/kernel/apic/bigsmp_32.c
+++ linux-2.6-tip/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);
Index: linux-2.6-tip/arch/x86/kernel/apic/probe_32.c
===================================================================
--- linux-2.6-tip.orig/arch/x86/kernel/apic/probe_32.c
+++ linux-2.6-tip/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)