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rcu: Remove !PREEMPT code from rcu_note_voluntary_context_switch() 

Because RCU-tasks exists only in PREEMPT kernels and because RCU-sched
no longer exists in PREEMPT kernels, it is no longer necessary for the
rcu_note_voluntary_context_switch() macro to do anything for !PREEMPT
kernels.  This commit therefore removes !PREEMPT-related code from
this macro, namely, the rcu_all_qs().

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-07-10 12:53:40 -07:00
parent 06462efc80
commit 4d232dfe1d
1 changed files with 2 additions and 6 deletions
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8
include/linux/rcupdate.h
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@ -150,18 +150,14 @@ static inline void rcu_init_nohz(void) { }
if (READ_ONCE((t)->rcu_tasks_holdout)) \ if (READ_ONCE((t)->rcu_tasks_holdout)) \
WRITE_ONCE((t)->rcu_tasks_holdout, false); \ WRITE_ONCE((t)->rcu_tasks_holdout, false); \
} while (0) } while (0)
#define rcu_note_voluntary_context_switch(t) \ #define rcu_note_voluntary_context_switch(t) rcu_tasks_qs(t)
do { \
rcu_all_qs(); \
rcu_tasks_qs(t); \
} while (0)
void call_rcu_tasks(struct rcu_head *head, rcu_callback_t func); void call_rcu_tasks(struct rcu_head *head, rcu_callback_t func);
void synchronize_rcu_tasks(void); void synchronize_rcu_tasks(void);
void exit_tasks_rcu_start(void); void exit_tasks_rcu_start(void);
void exit_tasks_rcu_finish(void); void exit_tasks_rcu_finish(void);
#else /* #ifdef CONFIG_TASKS_RCU */ #else /* #ifdef CONFIG_TASKS_RCU */
#define rcu_tasks_qs(t) do { } while (0) #define rcu_tasks_qs(t) do { } while (0)
#define rcu_note_voluntary_context_switch(t) rcu_all_qs() #define rcu_note_voluntary_context_switch(t) do { } while (0)
#define call_rcu_tasks call_rcu #define call_rcu_tasks call_rcu
#define synchronize_rcu_tasks synchronize_rcu #define synchronize_rcu_tasks synchronize_rcu
static inline void exit_tasks_rcu_start(void) { } static inline void exit_tasks_rcu_start(void) { }