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rcu: Remove unused __rcu_is_watching() function

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The x86/entry work removed all uses of __rcu_is_watching(), therefore
this commit removes it entirely.

Cc: Andy Lutomirski <luto@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <x86@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-08-17 10:37:22 -07:00
parent 666ca2907e
commit 7f2a53c231
4 changed files with 1 additions and 8 deletions
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1
include/linux/rcutiny.h
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@ -103,7 +103,6 @@ static inline void rcu_scheduler_starting(void) { }
static inline void rcu_end_inkernel_boot(void) { }
static inline bool rcu_inkernel_boot_has_ended(void) { return true; }
static inline bool rcu_is_watching(void) { return true; }
static inline bool __rcu_is_watching(void) { return true; }
static inline void rcu_momentary_dyntick_idle(void) { }
static inline void kfree_rcu_scheduler_running(void) { }
static inline bool rcu_gp_might_be_stalled(void) { return false; }

1
include/linux/rcutree.h
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@ -64,7 +64,6 @@ extern int rcu_scheduler_active __read_mostly;
void rcu_end_inkernel_boot(void);
bool rcu_inkernel_boot_has_ended(void);
bool rcu_is_watching(void);
bool __rcu_is_watching(void);
#ifndef CONFIG_PREEMPTION
void rcu_all_qs(void);
#endif

2
kernel/entry/common.c
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@ -278,7 +278,7 @@ noinstr irqentry_state_t irqentry_enter(struct pt_regs *regs)
* terminate a grace period, if and only if the timer interrupt is
* not nested into another interrupt.
*
* Checking for __rcu_is_watching() here would prevent the nesting
* Checking for rcu_is_watching() here would prevent the nesting
* interrupt to invoke rcu_irq_enter(). If that nested interrupt is
* the tick then rcu_flavor_sched_clock_irq() would wrongfully
* assume that it is the first interupt and eventually claim

5
kernel/rcu/tree.c
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@ -1077,11 +1077,6 @@ static void rcu_disable_urgency_upon_qs(struct rcu_data *rdp)
}
}
noinstr bool __rcu_is_watching(void)
{
return !rcu_dynticks_curr_cpu_in_eqs();
}
/**
* rcu_is_watching - see if RCU thinks that the current CPU is not idle
*