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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-05-09 19:55:54 +0400 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-08-19 05:06:44 +0400 |
| commit | feed66ed26a53e700ca02ce1744fed7d0c647292 (patch) | |
| tree | 63ce47c2a3882ff58c281ea53f3b19afaa1a4882 | |
| parent | f7f7bac9cb1c50783f15937a11743655a5756a36 (diff) | |
| download | linux-feed66ed26a53e700ca02ce1744fed7d0c647292.tar.xz | |
rcu: Eliminate unused APIs intended for adaptive ticks
The rcu_user_enter_after_irq() and rcu_user_exit_after_irq()
functions were intended for use by adaptive ticks, but changes
in implementation have rendered them unnecessary. This commit
therefore removes them.
Reported-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
| -rw-r--r-- | include/linux/rcupdate.h | 4 | ||||
| -rw-r--r-- | kernel/rcutree.c | 43 |
2 files changed, 0 insertions, 47 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index 0c38abbe6e35..30bea9c25735 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -229,13 +229,9 @@ extern void rcu_irq_exit(void); #ifdef CONFIG_RCU_USER_QS extern void rcu_user_enter(void); extern void rcu_user_exit(void); -extern void rcu_user_enter_after_irq(void); -extern void rcu_user_exit_after_irq(void); #else static inline void rcu_user_enter(void) { } static inline void rcu_user_exit(void) { } -static inline void rcu_user_enter_after_irq(void) { } -static inline void rcu_user_exit_after_irq(void) { } static inline void rcu_user_hooks_switch(struct task_struct *prev, struct task_struct *next) { } #endif /* CONFIG_RCU_USER_QS */ diff --git a/kernel/rcutree.c b/kernel/rcutree.c index 338f1d1c1c66..8807019138c6 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -444,27 +444,6 @@ void rcu_user_enter(void) { rcu_eqs_enter(1); } - -/** - * rcu_user_enter_after_irq - inform RCU that we are going to resume userspace - * after the current irq returns. - * - * This is similar to rcu_user_enter() but in the context of a non-nesting - * irq. After this call, RCU enters into idle mode when the interrupt - * returns. - */ -void rcu_user_enter_after_irq(void) -{ - unsigned long flags; - struct rcu_dynticks *rdtp; - - local_irq_save(flags); - rdtp = &__get_cpu_var(rcu_dynticks); - /* Ensure this irq is interrupting a non-idle RCU state. */ - WARN_ON_ONCE(!(rdtp->dynticks_nesting & DYNTICK_TASK_MASK)); - rdtp->dynticks_nesting = 1; - local_irq_restore(flags); -} #endif /* CONFIG_RCU_USER_QS */ /** @@ -581,28 +560,6 @@ void rcu_user_exit(void) { rcu_eqs_exit(1); } - -/** - * rcu_user_exit_after_irq - inform RCU that we won't resume to userspace - * idle mode after the current non-nesting irq returns. - * - * This is similar to rcu_user_exit() but in the context of an irq. - * This is called when the irq has interrupted a userspace RCU idle mode - * context. When the current non-nesting interrupt returns after this call, - * the CPU won't restore the RCU idle mode. - */ -void rcu_user_exit_after_irq(void) -{ - unsigned long flags; - struct rcu_dynticks *rdtp; - - local_irq_save(flags); - rdtp = &__get_cpu_var(rcu_dynticks); - /* Ensure we are interrupting an RCU idle mode. */ - WARN_ON_ONCE(rdtp->dynticks_nesting & DYNTICK_TASK_NEST_MASK); - rdtp->dynticks_nesting += DYNTICK_TASK_EXIT_IDLE; - local_irq_restore(flags); -} #endif /* CONFIG_RCU_USER_QS */ /** |