[tip:x86/apic] x86, apic: Clean up bigsmp apic selection code

tip-bot for Suresh Siddha
2011-05-22T10:44:12Z

Commit-ID: 69c252ffce77f4e38347d536ee4eab4aa162dc67
Gitweb: http://git.kernel.org/tip/69c252ffce77f4e38347d536ee4eab4aa162dc67
Author: Suresh Siddha <suresh.b.siddha@intel.com>
AuthorDate: Fri, 20 May 2011 17:51:19 -0700
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Sun, 22 May 2011 11:48:03 +0200

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>
---
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(-)

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 80b243c..f37703d 100644
--- 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
--- 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
--- 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)