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rcu: Remove the unused rcu_irq_exit_preempt() function

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Commit 9ee01e0f69 ("x86/entry: Clean up idtentry_enter/exit()
leftovers") left the rcu_irq_exit_preempt() in place in order to avoid
conflicts with the -rcu tree.  Now that this change has long since hit
mainline, this commit removes the no-longer-used rcu_irq_exit_preempt()
function.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2021-03-30 13:23:49 -07:00
parent 4c9c3809ae
commit ce7c169dee
3 changed files with 0 additions and 24 deletions
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1
include/linux/rcutiny.h
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@ -86,7 +86,6 @@ static inline void rcu_irq_enter(void) { }
static inline void rcu_irq_exit_irqson(void) { } static inline void rcu_irq_exit_irqson(void) { }
static inline void rcu_irq_enter_irqson(void) { } static inline void rcu_irq_enter_irqson(void) { }
static inline void rcu_irq_exit(void) { } static inline void rcu_irq_exit(void) { }
static inline void rcu_irq_exit_preempt(void) { }
static inline void rcu_irq_exit_check_preempt(void) { } static inline void rcu_irq_exit_check_preempt(void) { }
#define rcu_is_idle_cpu(cpu) \ #define rcu_is_idle_cpu(cpu) \
(is_idle_task(current) && !in_nmi() && !in_irq() && !in_serving_softirq()) (is_idle_task(current) && !in_nmi() && !in_irq() && !in_serving_softirq())

1
include/linux/rcutree.h
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@ -49,7 +49,6 @@ void rcu_idle_enter(void);
void rcu_idle_exit(void); void rcu_idle_exit(void);
void rcu_irq_enter(void); void rcu_irq_enter(void);
void rcu_irq_exit(void); void rcu_irq_exit(void);
void rcu_irq_exit_preempt(void);
void rcu_irq_enter_irqson(void); void rcu_irq_enter_irqson(void);
void rcu_irq_exit_irqson(void); void rcu_irq_exit_irqson(void);
bool rcu_is_idle_cpu(int cpu); bool rcu_is_idle_cpu(int cpu);

22
kernel/rcu/tree.c
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@ -833,28 +833,6 @@ void noinstr rcu_irq_exit(void)
rcu_nmi_exit(); rcu_nmi_exit();
} }
/**
* rcu_irq_exit_preempt - Inform RCU that current CPU is exiting irq
* towards in kernel preemption
*
* Same as rcu_irq_exit() but has a sanity check that scheduling is safe
* from RCU point of view. Invoked from return from interrupt before kernel
* preemption.
*/
void rcu_irq_exit_preempt(void)
{
lockdep_assert_irqs_disabled();
rcu_nmi_exit();
RCU_LOCKDEP_WARN(__this_cpu_read(rcu_data.dynticks_nesting) <= 0,
"RCU dynticks_nesting counter underflow/zero!");
RCU_LOCKDEP_WARN(__this_cpu_read(rcu_data.dynticks_nmi_nesting) !=
DYNTICK_IRQ_NONIDLE,
"Bad RCU dynticks_nmi_nesting counter\n");
RCU_LOCKDEP_WARN(rcu_dynticks_curr_cpu_in_eqs(),
"RCU in extended quiescent state!");
}
#ifdef CONFIG_PROVE_RCU #ifdef CONFIG_PROVE_RCU
/** /**
* rcu_irq_exit_check_preempt - Validate that scheduling is possible * rcu_irq_exit_check_preempt - Validate that scheduling is possible