diff options
Diffstat (limited to 'arch/powerpc/kernel/setup_64.c')
-rw-r--r-- | arch/powerpc/kernel/setup_64.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index 7393bac3c7f4..b89c6aac48c9 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -756,3 +756,31 @@ unsigned long memory_block_size_bytes(void) struct ppc_pci_io ppc_pci_io; EXPORT_SYMBOL(ppc_pci_io); #endif + +#ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF +u64 hw_nmi_get_sample_period(int watchdog_thresh) +{ + return ppc_proc_freq * watchdog_thresh; +} +#endif + +/* + * The perf based hardlockup detector breaks PMU event based branches, so + * disable it by default. Book3S has a soft-nmi hardlockup detector based + * on the decrementer interrupt, so it does not suffer from this problem. + * + * It is likely to get false positives in VM guests, so disable it there + * by default too. + */ +static int __init disable_hardlockup_detector(void) +{ +#ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF + hardlockup_detector_disable(); +#else + if (firmware_has_feature(FW_FEATURE_LPAR)) + hardlockup_detector_disable(); +#endif + + return 0; +} +early_initcall(disable_hardlockup_detector); |