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authorIngo Molnar <mingo@elte.hu>2009-01-31 03:36:17 +0100
committerIngo Molnar <mingo@elte.hu>2009-02-05 22:27:54 +0100
commit65a4e574d2382d83f71b30ea92f86d2e40a6ef8d (patch)
treed265ad2f64a3ae35ee3a9ad43b8c55b0e87f6c99
parentd8106d2e24d54497233ca9cd97fa9bec807de458 (diff)
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>
-rw-r--r--arch/x86/include/asm/io_apic.h9
-rw-r--r--arch/x86/kernel/apic.c4
-rw-r--r--arch/x86/kernel/io_apic.c11
-rw-r--r--arch/x86/kernel/smpboot.c2
-rw-r--r--include/linux/smp.h6
-rw-r--r--init/main.c12
6 files changed, 24 insertions, 20 deletions
diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 08ec793aa04..309d0e23193 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 85d8b50d1af..a04a73a51d2 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 57d60c741e3..84bccac4619 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 f40f86fec2f..96f7d304f5c 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;
}
diff --git a/include/linux/smp.h b/include/linux/smp.h
index 715196b09d6..d41a3a865fe 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -67,6 +67,12 @@ extern int __cpu_up(unsigned int cpunum);
extern void smp_cpus_done(unsigned int max_cpus);
/*
+ * Callback to arch code if there's nosmp or maxcpus=0 on the
+ * boot command line:
+ */
+extern void arch_disable_smp_support(void);
+
+/*
* Call a function on all other processors
*/
int smp_call_function(void(*func)(void *info), void *info, int wait);
diff --git a/init/main.c b/init/main.c
index bfe4fb0c984..6441083f827 100644
--- a/init/main.c
+++ b/init/main.c
@@ -136,14 +136,14 @@ unsigned int __initdata setup_max_cpus = NR_CPUS;
* greater than 0, limits the maximum number of CPUs activated in
* SMP mode to <NUM>.
*/
-#ifndef CONFIG_X86_IO_APIC
-static inline void disable_ioapic_setup(void) {};
-#endif
+
+void __weak arch_disable_smp_support(void) { }
static int __init nosmp(char *str)
{
setup_max_cpus = 0;
- disable_ioapic_setup();
+ arch_disable_smp_support();
+
return 0;
}
@@ -153,14 +153,14 @@ static int __init maxcpus(char *str)
{
get_option(&str, &setup_max_cpus);
if (setup_max_cpus == 0)
- disable_ioapic_setup();
+ arch_disable_smp_support();
return 0;
}
early_param("maxcpus", maxcpus);
#else
-#define setup_max_cpus NR_CPUS
+const unsigned int setup_max_cpus = NR_CPUS;
#endif
/*