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rcu: Fix missing TICK_DEP_MASK_RCU_EXP dependency check
[ Upstream commitdb7b464df9
] 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>
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2 changed files with 7 additions and 1 deletions
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@ -368,7 +368,8 @@ TRACE_EVENT(itimer_expire,
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tick_dep_name(PERF_EVENTS) \
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tick_dep_name(SCHED) \
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tick_dep_name(CLOCK_UNSTABLE) \
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tick_dep_name_end(RCU)
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tick_dep_name(RCU) \
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tick_dep_name_end(RCU_EXP)
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#undef tick_dep_name
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#undef tick_dep_mask_name
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@ -264,6 +264,11 @@ static bool check_tick_dependency(atomic_t *dep)
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return true;
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}
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if (val & TICK_DEP_MASK_RCU_EXP) {
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trace_tick_stop(0, TICK_DEP_MASK_RCU_EXP);
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return true;
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}
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return false;
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}
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