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rcu: Remove "cpu" argument to rcu_note_context_switch()

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The "cpu" argument to rcu_note_context_switch() is always the current
CPU, so drop it.  This in turn allows the "cpu" argument to
rcu_preempt_note_context_switch() to be removed, which allows the sole
use of "cpu" in both functions to be replaced with a this_cpu_ptr().
Again, the anticipated cross-CPU uses of these functions has been
replaced by NO_HZ_FULL.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Pranith Kumar <bobby.prani@gmail.com>
This commit is contained in:
Paul E. McKenney
2014-10-21 12:50:04 -07:00
parent 86aea0e6e7
commit 38200cf247
7 changed files with 11 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/rcutiny.h
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@@ -78,7 +78,7 @@ static inline void kfree_call_rcu(struct rcu_head *head,
call_rcu(head, func); call_rcu(head, func);
} }
static inline void rcu_note_context_switch(int cpu) static inline void rcu_note_context_switch(void)
{ {
rcu_sched_qs(); rcu_sched_qs();
} }

4
include/linux/rcutree.h
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@@ -30,7 +30,7 @@
#ifndef __LINUX_RCUTREE_H #ifndef __LINUX_RCUTREE_H
#define __LINUX_RCUTREE_H #define __LINUX_RCUTREE_H
void rcu_note_context_switch(int cpu); void rcu_note_context_switch(void);
#ifndef CONFIG_RCU_NOCB_CPU_ALL #ifndef CONFIG_RCU_NOCB_CPU_ALL
int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies); int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies);
#endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */ #endif /* #ifndef CONFIG_RCU_NOCB_CPU_ALL */
@@ -43,7 +43,7 @@ void rcu_cpu_stall_reset(void);
*/ */
static inline void rcu_virt_note_context_switch(int cpu) static inline void rcu_virt_note_context_switch(int cpu)
{ {
rcu_note_context_switch(cpu); rcu_note_context_switch();
} }
void synchronize_rcu_bh(void); void synchronize_rcu_bh(void);

4
kernel/rcu/tree.c
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@@ -286,11 +286,11 @@ static void rcu_momentary_dyntick_idle(void)
* and requires special handling for preemptible RCU. * and requires special handling for preemptible RCU.
* The caller must have disabled preemption. * The caller must have disabled preemption.
*/ */
void rcu_note_context_switch(int cpu) void rcu_note_context_switch(void)
{ {
trace_rcu_utilization(TPS("Start context switch")); trace_rcu_utilization(TPS("Start context switch"));
rcu_sched_qs(); rcu_sched_qs();
rcu_preempt_note_context_switch(cpu); rcu_preempt_note_context_switch();
if (unlikely(raw_cpu_read(rcu_sched_qs_mask))) if (unlikely(raw_cpu_read(rcu_sched_qs_mask)))
rcu_momentary_dyntick_idle(); rcu_momentary_dyntick_idle();
trace_rcu_utilization(TPS("End context switch")); trace_rcu_utilization(TPS("End context switch"));

2
kernel/rcu/tree.h
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@@ -547,7 +547,7 @@ DECLARE_PER_CPU(char, rcu_cpu_has_work);
/* Forward declarations for rcutree_plugin.h */ /* Forward declarations for rcutree_plugin.h */
static void rcu_bootup_announce(void); static void rcu_bootup_announce(void);
long rcu_batches_completed(void); long rcu_batches_completed(void);
static void rcu_preempt_note_context_switch(int cpu); static void rcu_preempt_note_context_switch(void);
static int rcu_preempt_blocked_readers_cgp(struct rcu_node *rnp); static int rcu_preempt_blocked_readers_cgp(struct rcu_node *rnp);
#ifdef CONFIG_HOTPLUG_CPU #ifdef CONFIG_HOTPLUG_CPU
static void rcu_report_unblock_qs_rnp(struct rcu_node *rnp, static void rcu_report_unblock_qs_rnp(struct rcu_node *rnp,

6
kernel/rcu/tree_plugin.h
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@@ -156,7 +156,7 @@ static void rcu_preempt_qs(void)
* *
* Caller must disable preemption. * Caller must disable preemption.
*/ */
static void rcu_preempt_note_context_switch(int cpu) static void rcu_preempt_note_context_switch(void)
{ {
struct task_struct *t = current; struct task_struct *t = current;
unsigned long flags; unsigned long flags;
@@ -167,7 +167,7 @@ static void rcu_preempt_note_context_switch(int cpu)
!t->rcu_read_unlock_special.b.blocked) { !t->rcu_read_unlock_special.b.blocked) {
/* Possibly blocking in an RCU read-side critical section. */ /* Possibly blocking in an RCU read-side critical section. */
rdp = per_cpu_ptr(rcu_preempt_state.rda, cpu); rdp = this_cpu_ptr(rcu_preempt_state.rda);
rnp = rdp->mynode; rnp = rdp->mynode;
raw_spin_lock_irqsave(&rnp->lock, flags); raw_spin_lock_irqsave(&rnp->lock, flags);
smp_mb__after_unlock_lock(); smp_mb__after_unlock_lock();
@@ -945,7 +945,7 @@ EXPORT_SYMBOL_GPL(rcu_batches_completed);
* Because preemptible RCU does not exist, we never have to check for * Because preemptible RCU does not exist, we never have to check for
* CPUs being in quiescent states. * CPUs being in quiescent states.
*/ */
static void rcu_preempt_note_context_switch(int cpu) static void rcu_preempt_note_context_switch(void)
{ {
} }

2
kernel/sched/core.c
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@@ -2802,7 +2802,7 @@ need_resched:
preempt_disable(); preempt_disable();
cpu = smp_processor_id(); cpu = smp_processor_id();
rq = cpu_rq(cpu); rq = cpu_rq(cpu);
rcu_note_context_switch(cpu); rcu_note_context_switch();
prev = rq->curr; prev = rq->curr;
schedule_debug(prev); schedule_debug(prev);

2
kernel/softirq.c
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@@ -656,7 +656,7 @@ static void run_ksoftirqd(unsigned int cpu)
* in the task stack here. * in the task stack here.
*/ */
__do_softirq(); __do_softirq();
rcu_note_context_switch(cpu); rcu_note_context_switch();
local_irq_enable(); local_irq_enable();
cond_resched(); cond_resched();
return; return;