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rcu: Fix missing TICK_DEP_MASK_RCU_EXP dependency check

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[ Upstream commit db7b464df9 ]

This commit adds checks for the TICK_DEP_MASK_RCU_EXP bit, thus enabling
RCU expedited grace periods to actually force-enable scheduling-clock
interrupts on holdout CPUs.

Fixes: df1e849ae4 ("rcu: Enable tick for nohz_full CPUs slow to provide expedited QS")
Signed-off-by: Zqiang <qiang1.zhang@intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Anna-Maria Behnsen <anna-maria@linutronix.de>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zqiang 2022-12-20 22:16:25 +08:00 • committed by Justin Hammond
parent 3408824320
commit 10ed430a48
2 changed files with 7 additions and 1 deletions
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3
include/trace/events/timer.h
View file

@ -368,7 +368,8 @@ TRACE_EVENT(itimer_expire,
tick_dep_name(PERF_EVENTS) \
tick_dep_name(SCHED) \
tick_dep_name(CLOCK_UNSTABLE) \
tick_dep_name_end(RCU)
tick_dep_name(RCU) \
tick_dep_name_end(RCU_EXP)
#undef tick_dep_name
#undef tick_dep_mask_name

5
kernel/time/tick-sched.c
View file

@ -264,6 +264,11 @@ static bool check_tick_dependency(atomic_t *dep)
return true;
}
if (val & TICK_DEP_MASK_RCU_EXP) {
trace_tick_stop(0, TICK_DEP_MASK_RCU_EXP);
return true;
}
return false;
}