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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-10-21 12:50:04 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-11-03 19:20:34 -0800 |
| commit | 38200cf24702e5d79ce6c8f4c62036c41845c62d (patch) | |
| tree | 840642332deb3f091142c78994de1f8db73b4f8c /kernel/rcu | |
| parent | 86aea0e6e7d571a9452082a7198d0603cc5dd965 (diff) | |
| download | linux-38200cf24702e5d79ce6c8f4c62036c41845c62d.tar.bz2 | |
rcu: Remove "cpu" argument to rcu_note_context_switch()
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Again, the anticipated cross-CPU uses of these functions has been
replaced by NO_HZ_FULL.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>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 4 | ||||
| -rw-r--r-- | kernel/rcu/tree.h | 2 | ||||
| -rw-r--r-- | kernel/rcu/tree_plugin.h | 6 |
3 files changed, 6 insertions, 6 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 1af5e2cdcbeb..b591f1459240 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -286,11 +286,11 @@ static void rcu_momentary_dyntick_idle(void) * and requires special handling for preemptible RCU. * 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")); rcu_sched_qs(); - rcu_preempt_note_context_switch(cpu); + rcu_preempt_note_context_switch(); if (unlikely(raw_cpu_read(rcu_sched_qs_mask))) rcu_momentary_dyntick_idle(); trace_rcu_utilization(TPS("End context switch")); diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index 94a26e330c1b..238ac39053fc 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -547,7 +547,7 @@ DECLARE_PER_CPU(char, rcu_cpu_has_work); /* Forward declarations for rcutree_plugin.h */ static void rcu_bootup_announce(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); #ifdef CONFIG_HOTPLUG_CPU static void rcu_report_unblock_qs_rnp(struct rcu_node *rnp, diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 7158814b7b4a..495d4cce47a7 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -156,7 +156,7 @@ static void rcu_preempt_qs(void) * * 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; unsigned long flags; @@ -167,7 +167,7 @@ static void rcu_preempt_note_context_switch(int cpu) !t->rcu_read_unlock_special.b.blocked) { /* 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; raw_spin_lock_irqsave(&rnp->lock, flags); 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 * CPUs being in quiescent states. */ -static void rcu_preempt_note_context_switch(int cpu) +static void rcu_preempt_note_context_switch(void) { } |