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author | Otavio Salvador <otavio@ossystems.com.br> | 2022-05-19 11:02:10 -0300 |
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committer | GitHub <noreply@github.com> | 2022-05-19 11:02:10 -0300 |
commit | b7007e1d615b8d4b71c28ebf790c5164fc4491d5 (patch) | |
tree | 48c35f63dc1101d0d528b5d79c81849b99ca7c6d /arch/x86/kernel/tsc_sync.c | |
parent | 38955ef654554c94f4d91bafb9ef5c5f41a4c0f6 (diff) | |
parent | 0e61b511dd8474280ba674590daa55f30433b7d4 (diff) |
Merge pull request #565 from philschenker/update-to-5.4.193__update-to-2.3.7__5.4-2.3.x-imx
Update Patchlevel on Branch 5.4-2.3.x-imx from 5.4.161->5.4.193
Diffstat (limited to 'arch/x86/kernel/tsc_sync.c')
-rw-r--r-- | arch/x86/kernel/tsc_sync.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/x86/kernel/tsc_sync.c b/arch/x86/kernel/tsc_sync.c index ec534f978867..59b114306300 100644 --- a/arch/x86/kernel/tsc_sync.c +++ b/arch/x86/kernel/tsc_sync.c @@ -30,6 +30,7 @@ struct tsc_adjust { }; static DEFINE_PER_CPU(struct tsc_adjust, tsc_adjust); +static struct timer_list tsc_sync_check_timer; /* * TSC's on different sockets may be reset asynchronously. @@ -77,6 +78,46 @@ void tsc_verify_tsc_adjust(bool resume) } } +/* + * Normally the tsc_sync will be checked every time system enters idle + * state, but there is still caveat that a system won't enter idle, + * either because it's too busy or configured purposely to not enter + * idle. + * + * So setup a periodic timer (every 10 minutes) to make sure the check + * is always on. + */ + +#define SYNC_CHECK_INTERVAL (HZ * 600) + +static void tsc_sync_check_timer_fn(struct timer_list *unused) +{ + int next_cpu; + + tsc_verify_tsc_adjust(false); + + /* Run the check for all onlined CPUs in turn */ + next_cpu = cpumask_next(raw_smp_processor_id(), cpu_online_mask); + if (next_cpu >= nr_cpu_ids) + next_cpu = cpumask_first(cpu_online_mask); + + tsc_sync_check_timer.expires += SYNC_CHECK_INTERVAL; + add_timer_on(&tsc_sync_check_timer, next_cpu); +} + +static int __init start_sync_check_timer(void) +{ + if (!cpu_feature_enabled(X86_FEATURE_TSC_ADJUST) || tsc_clocksource_reliable) + return 0; + + timer_setup(&tsc_sync_check_timer, tsc_sync_check_timer_fn, 0); + tsc_sync_check_timer.expires = jiffies + SYNC_CHECK_INTERVAL; + add_timer(&tsc_sync_check_timer); + + return 0; +} +late_initcall(start_sync_check_timer); + static void tsc_sanitize_first_cpu(struct tsc_adjust *cur, s64 bootval, unsigned int cpu, bool bootcpu) { |