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>

10 files changed, 13 insertions, 19 deletions

diff --git a/arch/x86/include/asm/es7000/wakecpu.h b/arch/x86/include/asm/es7000/wakecpu.h
index 5c4d05f46d2d..e8e03962633b 100644
--- a/arch/x86/include/asm/es7000/wakecpu.h
+++ b/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)
 {
 }
diff --git a/arch/x86/include/asm/mach-default/mach_wakecpu.h b/arch/x86/include/asm/mach-default/mach_wakecpu.h
index 1d34c69a758b..d059807cd7e8 100644
--- a/arch/x86/include/asm/mach-default/mach_wakecpu.h
+++ b/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)
 {
 }
diff --git a/arch/x86/include/asm/mach-generic/mach_wakecpu.h b/arch/x86/include/asm/mach-generic/mach_wakecpu.h
index 58e54122f730..30515a154d8e 100644
--- a/arch/x86/include/asm/mach-generic/mach_wakecpu.h
+++ b/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)
diff --git a/arch/x86/include/asm/numaq/wakecpu.h b/arch/x86/include/asm/numaq/wakecpu.h
index 884b95cf5846..61d0a7d96136 100644
--- a/arch/x86/include/asm/numaq/wakecpu.h
+++ b/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();
 }
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 558af378a61d..10873a46b299 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/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();
diff --git a/arch/x86/mach-generic/bigsmp.c b/arch/x86/mach-generic/bigsmp.c
index 40910bfd1b42..bd069e7b521c 100644
--- a/arch/x86/mach-generic/bigsmp.c
+++ b/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,
diff --git a/arch/x86/mach-generic/default.c b/arch/x86/mach-generic/default.c
index c2464843df9e..a25e6eff048f 100644
--- a/arch/x86/mach-generic/default.c
+++ b/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,
diff --git a/arch/x86/mach-generic/es7000.c b/arch/x86/mach-generic/es7000.c
index 4cb3984834ed..ab41b5439145 100644
--- a/arch/x86/mach-generic/es7000.c
+++ b/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,
diff --git a/arch/x86/mach-generic/numaq.c b/arch/x86/mach-generic/numaq.c
index fb03867e7c0f..4d3924f8cd0b 100644
--- a/arch/x86/mach-generic/numaq.c
+++ b/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,
diff --git a/arch/x86/mach-generic/summit.c b/arch/x86/mach-generic/summit.c
index fdca78b96b6a..2595baa7997e 100644
--- a/arch/x86/mach-generic/summit.c
+++ b/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,