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>
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@ -150,18 +150,14 @@ static inline void rcu_init_nohz(void) { }
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if (READ_ONCE((t)->rcu_tasks_holdout)) \
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WRITE_ONCE((t)->rcu_tasks_holdout, false); \
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} while (0)
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#define rcu_note_voluntary_context_switch(t) \
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do { \
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rcu_all_qs(); \
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rcu_tasks_qs(t); \
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} while (0)
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#define rcu_note_voluntary_context_switch(t) rcu_tasks_qs(t)
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void call_rcu_tasks(struct rcu_head *head, rcu_callback_t func);
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void synchronize_rcu_tasks(void);
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void exit_tasks_rcu_start(void);
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void exit_tasks_rcu_finish(void);
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#else /* #ifdef CONFIG_TASKS_RCU */
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#define rcu_tasks_qs(t) do { } while (0)
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#define rcu_note_voluntary_context_switch(t) rcu_all_qs()
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#define rcu_note_voluntary_context_switch(t) do { } while (0)
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#define call_rcu_tasks call_rcu
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#define synchronize_rcu_tasks synchronize_rcu
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static inline void exit_tasks_rcu_start(void) { }
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