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x86: Rework arch_disable_smp_support() for x86

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Currently arch_disable_smp_support() on x86 disables only the
support for the IOAPIC and is also compiled in if SMP-support is
not.

Therefore this function is renamed to disable_ioapic_support(),
which meets its purpose and is only compiled in the kernel
when IOAPIC support is also.

A new arch_disable_smp_support() is created in smpboot.c,
which calls disable_ioapic_support() and gets only compiled
in the kernel when SMP support is also.

Signed-off-by: Henrik Kretzschmar <henne@nachtwindheim.de>
LKML-Reference: <1298385487-4708-3-git-send-email-henne@nachtwindheim.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Henrik Kretzschmar 2011-02-22 15:38:05 +01:00 committed by Ingo Molnar
parent b6a1432da8
commit 7167d08e78
4 changed files with 20 additions and 4 deletions
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3
arch/x86/include/asm/io_apic.h
View File

@ -175,6 +175,8 @@ extern void __init pre_init_apic_IRQ0(void);
extern void mp_save_irq(struct mpc_intsrc *m);
extern void disable_ioapic_support(void);
#else /* !CONFIG_X86_IO_APIC */
#define io_apic_assign_pci_irqs 0
@ -189,6 +191,7 @@ struct io_apic_irq_attr;
static inline int io_apic_set_pci_routing(struct device *dev, int irq,
struct io_apic_irq_attr *irq_attr) { return 0; }
static inline void mp_save_irq(struct mpc_intsrc *m) { };
static inline void disable_ioapic_support(void) { }
#endif
#endif /* _ASM_X86_IO_APIC_H */

3
arch/x86/kernel/apic/apic.c
View File

@ -43,6 +43,7 @@
#include <asm/i8259.h>
#include <asm/proto.h>
#include <asm/apic.h>
#include <asm/io_apic.h>
#include <asm/desc.h>
#include <asm/hpet.h>
#include <asm/idle.h>
@ -1209,7 +1210,7 @@ void __cpuinit setup_local_APIC(void)
rdtscll(tsc);
if (disable_apic) {
arch_disable_smp_support();
disable_ioapic_support();
return;
}

7
arch/x86/kernel/apic/io_apic.c
View File

@ -108,7 +108,10 @@ DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
int skip_ioapic_setup;
void arch_disable_smp_support(void)
/**
* disable_ioapic_support() - disables ioapic support at runtime
*/
void disable_ioapic_support(void)
{
#ifdef CONFIG_PCI
noioapicquirk = 1;
@ -120,7 +123,7 @@ void arch_disable_smp_support(void)
static int __init parse_noapic(char *str)
{
/* disable IO-APIC */
arch_disable_smp_support();
disable_ioapic_support();
return 0;
}
early_param("noapic", parse_noapic);

11
arch/x86/kernel/smpboot.c
View File

@ -64,6 +64,7 @@
#include <asm/mtrr.h>
#include <asm/mwait.h>
#include <asm/apic.h>
#include <asm/io_apic.h>
#include <asm/setup.h>
#include <asm/uv/uv.h>
#include <linux/mc146818rtc.h>
@ -945,6 +946,14 @@ int __cpuinit native_cpu_up(unsigned int cpu)
return 0;
}
/**
* arch_disable_smp_support() - disables SMP support for x86 at runtime
*/
void arch_disable_smp_support(void)
{
disable_ioapic_support();
}
/*
* Fall back to non SMP mode after errors.
*
@ -1045,7 +1054,7 @@ static int __init smp_sanity_check(unsigned max_cpus)
"(tell your hw vendor)\n");
}
smpboot_clear_io_apic();
arch_disable_smp_support();
disable_ioapic_support();
return -1;
}