diff options
| author | Cyrill Gorcunov <gorcunov@openvz.org> | 2009-09-15 11:12:30 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-20 20:18:07 +0200 |
| commit | 8312136fa8b0a3ec7323bbb1a46be8c0c26e994e (patch) | |
| tree | fc90b5de2e93522c505105f59c8ce6a0162bb6b9 | |
| parent | efc8f7419ea0a97c38d0b80785c8c3d9ab8a4872 (diff) | |
x86, apic: Fix missed handling of discrete apics
In case of discrete (pretty old) apics we may have cpu_has_apic bit
not set but have to check if smp_found_config (MP spec) is there
and apic was not disabled.
Also don't forget to print apic/io-apic for such case as well.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: "Maciej W. Rozycki" <macro@linux-mips.org>
Cc: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <20090915071230.GA10604@lenovo>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | arch/x86/include/asm/apic.h | 13 | ||||
| -rw-r--r-- | arch/x86/kernel/apic/apic.c | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/apic/io_apic.c | 4 |
3 files changed, 16 insertions, 3 deletions
diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h index 586b7adb8e5..9a86fb40490 100644 --- a/arch/x86/include/asm/apic.h +++ b/arch/x86/include/asm/apic.h @@ -66,6 +66,19 @@ static inline void default_inquire_remote_apic(int apicid) } /* + * With 82489DX we can't rely on apic feature bit + * retrieved via cpuid but still have to deal with + * such an apic chip so we assume that SMP configuration + * is found from MP table (64bit case uses ACPI mostly + * which set smp presence flag as well so we are safe + * to use this helper too). + */ +static inline bool apic_from_smp_config(void) +{ + return smp_found_config && !disable_apic; +} + +/* * Basic functions accessing APICs. */ #ifdef CONFIG_PARAVIRT diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 072aea6c630..2d59dfa2978 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -978,7 +978,7 @@ void lapic_shutdown(void) { unsigned long flags; - if (!cpu_has_apic) + if (!cpu_has_apic && !apic_from_smp_config()) return; local_irq_save(flags); diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index 3c8f9e75d03..593c4f8a8bb 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -1863,7 +1863,7 @@ __apicdebuginit(int) print_all_ICs(void) print_PIC(); /* don't print out if apic is not there */ - if (!cpu_has_apic || disable_apic) + if (!cpu_has_apic && !apic_from_smp_config()) return 0; print_all_local_APICs(); @@ -1981,7 +1981,7 @@ void disable_IO_APIC(void) /* * Use virtual wire A mode when interrupt remapping is enabled. */ - if (cpu_has_apic) + if (cpu_has_apic || apic_from_smp_config()) disconnect_bsp_APIC(!intr_remapping_enabled && ioapic_i8259.pin != -1); } |