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| author | Thomas Gleixner <tglx@linutronix.de> | 2008-01-30 13:33:04 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:33:04 +0100 |
| commit | c2b84b30b8c8bbccf4d2e32f8a3a70ad09ba9ab8 (patch) | |
| tree | db749014619fdef88cf458daad810ddd06023fe7 /arch/x86/kernel/apic_32.c | |
| parent | 387faedb1dee2e917811acd05902cc36142a4850 (diff) | |
| download | blackbird-op-linux-c2b84b30b8c8bbccf4d2e32f8a3a70ad09ba9ab8.tar.gz blackbird-op-linux-c2b84b30b8c8bbccf4d2e32f8a3a70ad09ba9ab8.zip | |
x86: sanity check APIC timer frequency
Check the APIC timer calibration result for sanity. When the frequency
is out of range, issue a warning and disable the local APIC timer.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/apic_32.c')
| -rw-r--r-- | arch/x86/kernel/apic_32.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c index cbcf72cde956..20d4dbc42e6e 100644 --- a/arch/x86/kernel/apic_32.c +++ b/arch/x86/kernel/apic_32.c @@ -470,6 +470,19 @@ void __init setup_boot_APIC_clock(void) local_apic_timer_verify_ok = 1; + /* + * Do a sanity check on the APIC calibration result + */ + if (calibration_result < (1000000 / HZ)) { + local_irq_enable(); + printk(KERN_WARNING + "APIC frequency too slow, disabling apic timer\n"); + /* No broadcast on UP ! */ + if (num_possible_cpus() > 1) + setup_APIC_timer(); + return; + } + /* We trust the pm timer based calibration */ if (!pm_referenced) { apic_printk(APIC_VERBOSE, "... verify APIC timer\n"); |
