smp, generic: introduce arch_disable_smp_support() instead of disable_ioapic_setup()

Impact: cleanup

disable_ioapic_setup() in init/main.c is ugly as the function is
x86-specific. The #ifdef inline prototype there is ugly too.

Replace it with a generic arch_disable_smp_support() function - which
has a weak alias for non-x86 architectures and for non-ioapic x86 builds.

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

4 files changed, 12 insertions, 14 deletions

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 08ec793aa043..309d0e23193a 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -143,15 +143,6 @@ extern int noioapicreroute;
 /* 1 if the timer IRQ uses the '8259A Virtual Wire' mode */
 extern int timer_through_8259;
 
-static inline void disable_ioapic_setup(void)
-{
-#ifdef CONFIG_PCI
-        noioapicquirk = 1;
-        noioapicreroute = -1;
-#endif
-        skip_ioapic_setup = 1;
-}
-
 /*
  * If we use the IO-APIC for IRQ routing, disable automatic
  * assignment of PCI IRQ's.
diff --git a/arch/x86/kernel/apic.c b/arch/x86/kernel/apic.c
index 85d8b50d1af7..a04a73a51d20 100644
--- a/arch/x86/kernel/apic.c
+++ b/arch/x86/kernel/apic.c
@@ -1138,9 +1138,7 @@ void __cpuinit setup_local_APIC(void)
         int i, j;
 
         if (disable_apic) {
-#ifdef CONFIG_X86_IO_APIC
-                disable_ioapic_setup();
-#endif
+                arch_disable_smp_support();
                 return;
         }
 
diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c
index 57d60c741e37..84bccac4619f 100644
--- a/arch/x86/kernel/io_apic.c
+++ b/arch/x86/kernel/io_apic.c
@@ -98,10 +98,19 @@ DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
 
 int skip_ioapic_setup;
 
+void arch_disable_smp_support(void)
+{
+#ifdef CONFIG_PCI
+        noioapicquirk = 1;
+        noioapicreroute = -1;
+#endif
+        skip_ioapic_setup = 1;
+}
+
 static int __init parse_noapic(char *str)
 {
         /* disable IO-APIC */
-        disable_ioapic_setup();
+        arch_disable_smp_support();
         return 0;
 }
 early_param("noapic", parse_noapic);
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index f40f86fec2fe..96f7d304f5c9 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1071,7 +1071,7 @@ static int __init smp_sanity_check(unsigned max_cpus)
                 printk(KERN_ERR "... forcing use of dummy APIC emulation."
                                 "(tell your hw vendor)\n");
                 smpboot_clear_io_apic();
-                disable_ioapic_setup();
+                arch_disable_smp_support();
                 return -1;
         }