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rcu-tasks: Allow standalone use of TASKS_{TRACE_,}RCU

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This commit allows TASKS_TRACE_RCU to be used independently of TASKS_RCU
and vice versa.

[ paulmck: Fix conditional compilation per kbuild test robot feedback. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-04-05 20:49:13 -07:00
parent 7e0669c3e9
commit 25246fc831
1 changed files with 30 additions and 24 deletions
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54
kernel/rcu/tasks.h
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@ -244,27 +244,6 @@ static void __init rcu_spawn_tasks_kthread_generic(struct rcu_tasks *rtp)
smp_mb(); /* Ensure others see full kthread. */
}
/* Do the srcu_read_lock() for the above synchronize_srcu(). */
void exit_tasks_rcu_start(void) __acquires(&tasks_rcu_exit_srcu)
{
preempt_disable();
current->rcu_tasks_idx = __srcu_read_lock(&tasks_rcu_exit_srcu);
preempt_enable();
}
static void exit_tasks_rcu_finish_trace(struct task_struct *t);
/* Do the srcu_read_unlock() for the above synchronize_srcu(). */
void exit_tasks_rcu_finish(void) __releases(&tasks_rcu_exit_srcu)
{
struct task_struct *t = current;
preempt_disable();
__srcu_read_unlock(&tasks_rcu_exit_srcu, t->rcu_tasks_idx);
preempt_enable();
exit_tasks_rcu_finish_trace(t);
}
#ifndef CONFIG_TINY_RCU
/*
@ -303,7 +282,9 @@ static void show_rcu_tasks_generic_gp_kthread(struct rcu_tasks *rtp, char *s)
s);
}
#ifdef CONFIG_TASKS_RCU
static void exit_tasks_rcu_finish_trace(struct task_struct *t);
#if defined(CONFIG_TASKS_RCU) || defined(CONFIG_TASKS_TRACE_RCU)
////////////////////////////////////////////////////////////////////////
//
@ -374,6 +355,10 @@ static void rcu_tasks_wait_gp(struct rcu_tasks *rtp)
rtp->postgp_func(rtp);
}
#endif /* #if defined(CONFIG_TASKS_RCU) || defined(CONFIG_TASKS_TRACE_RCU) */
#ifdef CONFIG_TASKS_RCU
////////////////////////////////////////////////////////////////////////
//
// Simple variant of RCU whose quiescent states are voluntary context
@ -577,8 +562,29 @@ static void show_rcu_tasks_classic_gp_kthread(void)
show_rcu_tasks_generic_gp_kthread(&rcu_tasks, "");
}
/* Do the srcu_read_lock() for the above synchronize_srcu(). */
void exit_tasks_rcu_start(void) __acquires(&tasks_rcu_exit_srcu)
{
preempt_disable();
current->rcu_tasks_idx = __srcu_read_lock(&tasks_rcu_exit_srcu);
preempt_enable();
}
/* Do the srcu_read_unlock() for the above synchronize_srcu(). */
void exit_tasks_rcu_finish(void) __releases(&tasks_rcu_exit_srcu)
{
struct task_struct *t = current;
preempt_disable();
__srcu_read_unlock(&tasks_rcu_exit_srcu, t->rcu_tasks_idx);
preempt_enable();
exit_tasks_rcu_finish_trace(t);
}
#else /* #ifdef CONFIG_TASKS_RCU */
static void show_rcu_tasks_classic_gp_kthread(void) { }
void exit_tasks_rcu_start(void) { }
void exit_tasks_rcu_finish(void) { exit_tasks_rcu_finish_trace(current); }
#endif /* #else #ifdef CONFIG_TASKS_RCU */
#ifdef CONFIG_TASKS_RUDE_RCU
@ -1075,7 +1081,7 @@ static void rcu_tasks_trace_postgp(struct rcu_tasks *rtp)
}
/* Report any needed quiescent state for this exiting task. */
void exit_tasks_rcu_finish_trace(struct task_struct *t)
static void exit_tasks_rcu_finish_trace(struct task_struct *t)
{
WRITE_ONCE(t->trc_reader_checked, true);
WARN_ON_ONCE(t->trc_reader_nesting);
@ -1170,7 +1176,7 @@ static void show_rcu_tasks_trace_gp_kthread(void)
}
#else /* #ifdef CONFIG_TASKS_TRACE_RCU */
void exit_tasks_rcu_finish_trace(struct task_struct *t) { }
static void exit_tasks_rcu_finish_trace(struct task_struct *t) { }
static inline void show_rcu_tasks_trace_gp_kthread(void) {}
#endif /* #else #ifdef CONFIG_TASKS_TRACE_RCU */