Commit 0e576acb authored by Thomas Gleixner's avatar Thomas Gleixner

nohz: Fix another inconsistency between CONFIG_NO_HZ=n and nohz=off

If CONFIG_NO_HZ=n tick_nohz_get_sleep_length() returns NSEC_PER_SEC/HZ.

If CONFIG_NO_HZ=y and the nohz functionality is disabled via the
command line option "nohz=off" or not enabled due to missing hardware
support, then tick_nohz_get_sleep_length() returns 0. That happens
because ts->sleep_length is never set in that case.

Set it to NSEC_PER_SEC/HZ when the NOHZ mode is inactive.
Reported-by: default avatarMichal Hocko <mhocko@suse.cz>
Reported-by: default avatarBorislav Petkov <bp@alien8.de>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 70fe8217
...@@ -711,8 +711,10 @@ static bool can_stop_idle_tick(int cpu, struct tick_sched *ts) ...@@ -711,8 +711,10 @@ static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)
return false; return false;
} }
if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE)) if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE)) {
ts->sleep_length = (ktime_t) { .tv64 = NSEC_PER_SEC/HZ };
return false; return false;
}
if (need_resched()) if (need_resched())
return false; return false;
......
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