x86, smp: refactor ->smp_callin_clear_local_apic() methods

Only NUMAQ does something substantial here, because it initializes
via NMIs (not via INIT as standard SMP startup) - so it needs to
reset the APIC.

 - extend the generic code to handle NULL methods

 - clear out dummy methods and replace them with NULL

 - clean up: remove wrapper macros, etc.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/include/asm/es7000/wakecpu.h

@@ -13,11 +13,6 @@ static inline void es7000_wait_for_init_deassert(atomic_t *deassert)
 	return;
 }
 
-/* Nothing to do for most platforms, since cleared by the INIT cycle */
-static inline void smp_callin_clear_local_apic(void)
-{
-}
-
 static inline void store_NMI_vector(unsigned short *high, unsigned short *low)
 {
 }

arch/x86/include/asm/mach-default/mach_wakecpu.h

@@ -8,11 +8,6 @@ static inline void default_wait_for_init_deassert(atomic_t *deassert)
 	return;
 }
 
-/* Nothing to do for most platforms, since cleared by the INIT cycle */
-static inline void smp_callin_clear_local_apic(void)
-{
-}
-
 static inline void store_NMI_vector(unsigned short *high, unsigned short *low)
 {
 }

arch/x86/include/asm/mach-generic/mach_wakecpu.h

@@ -1,7 +1,6 @@
 #ifndef _ASM_X86_MACH_GENERIC_MACH_WAKECPU_H
 #define _ASM_X86_MACH_GENERIC_MACH_WAKECPU_H
 
-#define smp_callin_clear_local_apic (apic->smp_callin_clear_local_apic)
 #define store_NMI_vector (apic->store_NMI_vector)
 #define restore_NMI_vector (apic->restore_NMI_vector)
 #define inquire_remote_apic (apic->inquire_remote_apic)

arch/x86/include/asm/numaq/wakecpu.h

@@ -8,9 +8,9 @@
 
 /*
  * Because we use NMIs rather than the INIT-STARTUP sequence to
- * bootstrap the CPUs, the APIC may be in a weird state. Kick it.
+ * bootstrap the CPUs, the APIC may be in a weird state. Kick it:
  */
-static inline void smp_callin_clear_local_apic(void)
+static inline void numaq_smp_callin_clear_local_apic(void)
 {
 	clear_local_APIC();
 }

arch/x86/kernel/smpboot.c

@@ -244,7 +244,8 @@ static void __cpuinit smp_callin(void)
 	 */
 
 	pr_debug("CALLIN, before setup_local_APIC().\n");
-	smp_callin_clear_local_apic();
+	if (apic->smp_callin_clear_local_apic)
+		apic->smp_callin_clear_local_apic();
 	setup_local_APIC();
 	end_local_APIC_setup();
 	map_cpu_to_logical_apicid();

arch/x86/mach-generic/bigsmp.c

@@ -109,7 +109,8 @@ struct genapic apic_bigsmp = {
 
 	.wait_for_init_deassert		= default_wait_for_init_deassert,
 
-	.smp_callin_clear_local_apic	= smp_callin_clear_local_apic,
+	.smp_callin_clear_local_apic	= NULL,
+
 	.store_NMI_vector		= store_NMI_vector,
 	.restore_NMI_vector		= restore_NMI_vector,
 	.inquire_remote_apic		= inquire_remote_apic,

arch/x86/mach-generic/default.c

@@ -90,7 +90,7 @@ struct genapic apic_default = {
 
 	.wait_for_init_deassert		= default_wait_for_init_deassert,
 
-	.smp_callin_clear_local_apic	= smp_callin_clear_local_apic,
+	.smp_callin_clear_local_apic	= NULL,
 	.store_NMI_vector		= store_NMI_vector,
 	.restore_NMI_vector		= restore_NMI_vector,
 	.inquire_remote_apic		= inquire_remote_apic,

arch/x86/mach-generic/es7000.c

@@ -145,7 +145,9 @@ struct genapic apic_es7000 = {
 
 	.wait_for_init_deassert		= default_wait_for_init_deassert,
 
-	.smp_callin_clear_local_apic	= smp_callin_clear_local_apic,
+	/* Nothing to do for most platforms, since cleared by the INIT cycle: */
+	.smp_callin_clear_local_apic	= NULL,
+
 	.store_NMI_vector		= store_NMI_vector,
 	.restore_NMI_vector		= restore_NMI_vector,
 	.inquire_remote_apic		= inquire_remote_apic,

arch/x86/mach-generic/numaq.c

@@ -110,7 +110,7 @@ struct genapic apic_numaq = {
 	/* We don't do anything here because we use NMI's to boot instead */
 	.wait_for_init_deassert		= NULL,
 
-	.smp_callin_clear_local_apic	= smp_callin_clear_local_apic,
+	.smp_callin_clear_local_apic	= numaq_smp_callin_clear_local_apic,
 	.store_NMI_vector		= store_NMI_vector,
 	.restore_NMI_vector		= restore_NMI_vector,
 	.inquire_remote_apic		= inquire_remote_apic,

arch/x86/mach-generic/summit.c

@@ -89,7 +89,8 @@ struct genapic apic_summit = {
 
 	.wait_for_init_deassert		= default_wait_for_init_deassert,
 
-	.smp_callin_clear_local_apic	= smp_callin_clear_local_apic,
+	.smp_callin_clear_local_apic	= NULL,
+
 	.store_NMI_vector		= store_NMI_vector,
 	.restore_NMI_vector		= restore_NMI_vector,
 	.inquire_remote_apic		= inquire_remote_apic,