diff options
| -rw-r--r-- | Documentation/kernel-parameters.txt | 2 | ||||
| -rw-r--r-- | arch/x86_64/kernel/apic.c | 11 | ||||
| -rw-r--r-- | include/asm-x86_64/apic.h | 1 |
3 files changed, 13 insertions, 1 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 09640a8f7ceb..ef2ffded1392 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -780,7 +780,7 @@ and is between 256 and 4096 characters. It is defined in the file lapic [IA-32,APIC] Enable the local APIC even if BIOS disabled it. - lapic_timer_c2_ok [IA-32,APIC] trust the local apic timer in + lapic_timer_c2_ok [IA-32,x86-64,APIC] trust the local apic timer in C2 power state. lasi= [HW,SCSI] PARISC LASI driver for the 53c700 chip diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c index 723417d924c0..46acf4f2f1ec 100644 --- a/arch/x86_64/kernel/apic.c +++ b/arch/x86_64/kernel/apic.c @@ -47,6 +47,10 @@ int apic_calibrate_pmtmr __initdata; int disable_apic_timer __initdata; +/* Local APIC timer works in C2? */ +int local_apic_timer_c2_ok; +EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok); + static struct resource *ioapic_resources; static struct resource lapic_resource = { .name = "Local APIC", @@ -1192,6 +1196,13 @@ static __init int setup_nolapic(char *str) } early_param("nolapic", setup_nolapic); +static int __init parse_lapic_timer_c2_ok(char *arg) +{ + local_apic_timer_c2_ok = 1; + return 0; +} +early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok); + static __init int setup_noapictimer(char *str) { if (str[0] != ' ' && str[0] != 0) diff --git a/include/asm-x86_64/apic.h b/include/asm-x86_64/apic.h index e81d0f289f0b..7cfb39cbd918 100644 --- a/include/asm-x86_64/apic.h +++ b/include/asm-x86_64/apic.h @@ -102,5 +102,6 @@ void switch_ipi_to_APIC_timer(void *cpumask); #define ARCH_APICTIMER_STOPS_ON_C3 1 extern unsigned boot_cpu_id; +extern int local_apic_timer_c2_ok; #endif /* __ASM_APIC_H */ |