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nohz: Fix another inconsistency between CONFIG_NO_HZ=n and nohz=off
commit 0e576acbc1d9600cf2d9b4a141a2554639959d50 upstream. 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: Michal Hocko <mhocko@suse.cz> Reported-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Rui Xiang <rui.xiang@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -720,8 +720,10 @@ static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)
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return false;
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}
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if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE))
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if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE)) {
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ts->sleep_length = (ktime_t) { .tv64 = NSEC_PER_SEC/HZ };
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return false;
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}
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if (need_resched())
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return false;
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