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rcutorture: Call preempt_schedule() through static call/key 

The rcutorture test suite sometimess triggers a random scheduler
preemption call while simulating a read delay.  Unfortunately, its
direct call to preempt_schedule() bypasses the static call/key filter
used by CONFIG_PREEMPT_DYNAMIC.  This breaks the no-preempt assumption
when the dynamic preemption mode is "none".

For example, rcu_blocking_is_gp() is fooled and abbreviates grace periods
when the CPU runs in no-preempt UP mode.

Fix this by making torture_preempt_schedule() call __preempt_schedule(),
which uses the static call/key.

Reported-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Frederic Weisbecker 2022-03-15 16:33:38 +01:00 committed by Paul E. McKenney
parent 80dcee6951
commit bd6c375b92
1 changed files with 1 additions and 1 deletions
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2
include/linux/torture.h
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@ -118,7 +118,7 @@ void _torture_stop_kthread(char *m, struct task_struct **tp);
_torture_stop_kthread("Stopping " #n " task", &(tp))
#ifdef CONFIG_PREEMPTION
#define torture_preempt_schedule() preempt_schedule()
#define torture_preempt_schedule() __preempt_schedule()
#else
#define torture_preempt_schedule() do { } while (0)
#endif