diff options
| author | Thomas Hellström <thomas.hellstrom@linux.intel.com> | 2024-04-12 15:14:25 +0200 |
|---|---|---|
| committer | Thomas Hellström <thomas.hellstrom@linux.intel.com> | 2024-04-12 15:14:25 +0200 |
| commit | 79790b6818e96c58fe2bffee1b418c16e64e7b80 (patch) | |
| tree | 1b1f34807410ae05c17658c768f45f951e9420bc /include/linux/clocksource.h | |
| parent | 12f4b58a37f48a049893f1ae04b3fbb9b5088e8c (diff) | |
| parent | 6e1f415e7129f7cd4c2394af83b35cdcdd40baf7 (diff) | |
Merge drm/drm-next into drm-xe-next
Backmerging drm-next in order to get up-to-date and in particular
to access commit 9ca5facd0400f610f3f7f71aeb7fc0b949a48c67.
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Diffstat (limited to 'include/linux/clocksource.h')
| -rw-r--r-- | include/linux/clocksource.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h index 1d42d4b17327..0ad8b550bb4b 100644 --- a/include/linux/clocksource.h +++ b/include/linux/clocksource.h @@ -291,7 +291,19 @@ static inline void timer_probe(void) {} #define TIMER_ACPI_DECLARE(name, table_id, fn) \ ACPI_DECLARE_PROBE_ENTRY(timer, name, table_id, 0, NULL, 0, fn) -extern ulong max_cswd_read_retries; +static inline unsigned int clocksource_get_max_watchdog_retry(void) +{ + /* + * When system is in the boot phase or under heavy workload, there + * can be random big latencies during the clocksource/watchdog + * read, so allow retries to filter the noise latency. As the + * latency's frequency and maximum value goes up with the number of + * CPUs, scale the number of retries with the number of online + * CPUs. + */ + return (ilog2(num_online_cpus()) / 2) + 1; +} + void clocksource_verify_percpu(struct clocksource *cs); #endif /* _LINUX_CLOCKSOURCE_H */ |