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| author | Peter Zijlstra <peterz@infradead.org> | 2023-05-19 12:21:04 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-06-05 21:11:06 +0200 |
| commit | 91b41a237512b569746e1f560a42d9fba077261d (patch) | |
| tree | 03db4aa84444888fb7d7d731fe61575fe58b47e3 /arch/s390/kernel/time.c | |
| parent | 6b10fef09f937433563822f4bb6a2f947176e5a0 (diff) | |
| download | linux-stable-91b41a237512b569746e1f560a42d9fba077261d.tar.gz linux-stable-91b41a237512b569746e1f560a42d9fba077261d.tar.bz2 linux-stable-91b41a237512b569746e1f560a42d9fba077261d.zip | |
s390/time: Provide sched_clock_noinstr()
With the intent to provide local_clock_noinstr(), a variant of
local_clock() that's safe to be called from noinstr code (with the
assumption that any such code will already be non-preemptible),
prepare for things by providing a noinstr sched_clock_noinstr()
function.
Specifically, preempt_enable_*() calls out to schedule(), which upsets
noinstr validation efforts.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Tested-by: Michael Kelley <mikelley@microsoft.com> # Hyper-V
Link: https://lore.kernel.org/r/20230519102715.570170436@infradead.org
Diffstat (limited to 'arch/s390/kernel/time.c')
| -rw-r--r-- | arch/s390/kernel/time.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c index 6b7b6d5e3632..276278199c44 100644 --- a/arch/s390/kernel/time.c +++ b/arch/s390/kernel/time.c @@ -102,6 +102,11 @@ void __init time_early_init(void) ((long) qui.old_leap * 4096000000L); } +unsigned long long noinstr sched_clock_noinstr(void) +{ + return tod_to_ns(__get_tod_clock_monotonic()); +} + /* * Scheduler clock - returns current time in nanosec units. */ |