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rcu-tasks: Refactor RCU-tasks to allow variants to be added

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This commit splits out generic processing from RCU-tasks-specific
processing in order to allow additional flavors to be added.  It also
adds a def_bool TASKS_RCU_GENERIC to enable the common RCU-tasks
infrastructure code.

This is primarily, but not entirely, a code-movement commit.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney
2020-03-03 11:49:21 -08:00
parent 9cf8fc6fab
commit 5873b8a94e
4 changed files with 303 additions and 270 deletions
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6
include/linux/rcupdate.h
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@@ -129,7 +129,7 @@ static inline void rcu_init_nohz(void) { }
* Note a quasi-voluntary context switch for RCU-tasks's benefit.
* This is a macro rather than an inline function to avoid #include hell.
*/
#ifdef CONFIG_TASKS_RCU
#ifdef CONFIG_TASKS_RCU_GENERIC
#define rcu_tasks_qs(t) \
do { \
if (READ_ONCE((t)->rcu_tasks_holdout)) \
@@ -140,14 +140,14 @@ void call_rcu_tasks(struct rcu_head *head, rcu_callback_t func);
void synchronize_rcu_tasks(void);
void exit_tasks_rcu_start(void);
void exit_tasks_rcu_finish(void);
#else /* #ifdef CONFIG_TASKS_RCU */
#else /* #ifdef CONFIG_TASKS_RCU_GENERIC */
#define rcu_tasks_qs(t) do { } while (0)
#define rcu_note_voluntary_context_switch(t) do { } while (0)
#define call_rcu_tasks call_rcu
#define synchronize_rcu_tasks synchronize_rcu
static inline void exit_tasks_rcu_start(void) { }
static inline void exit_tasks_rcu_finish(void) { }
#endif /* #else #ifdef CONFIG_TASKS_RCU */
#endif /* #else #ifdef CONFIG_TASKS_RCU_GENERIC */
/**
* cond_resched_tasks_rcu_qs - Report potential quiescent states to RCU