From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org,
rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com,
fweisbec@gmail.com, oleg@redhat.com,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 14/17] rcu: Fold rcu_eqs_exit_common() into rcu_eqs_exit()
Date: Fri, 1 Dec 2017 11:36:45 -0800 [thread overview]
Message-ID: <1512157008-22355-14-git-send-email-paulmck@linux.vnet.ibm.com> (raw)
In-Reply-To: <20171201193625.GA20681@linux.vnet.ibm.com>
There is now only one call to rcu_eqs_exit_common() and there is no other
reason to keep it separate. This commit therefore inlines it into its
sole call site, saving a few lines of code in the process.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
kernel/rcu/tree.c | 50 ++++++++++++++++++--------------------------------
1 file changed, 18 insertions(+), 32 deletions(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 5c8a5796c71f..46a8e06bf03e 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -917,34 +917,6 @@ void rcu_irq_exit_irqson(void)
}
/*
- * rcu_eqs_exit_common - current CPU moving away from extended quiescent state
- *
- * If the new value of the ->dynticks_nesting counter was previously zero,
- * we really have exited idle, and must do the appropriate accounting.
- * The caller must have disabled interrupts.
- */
-static void rcu_eqs_exit_common(long newval, int user)
-{
- RCU_TRACE(struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks);)
-
- rcu_dynticks_task_exit();
- rcu_dynticks_eqs_exit();
- rcu_cleanup_after_idle();
- trace_rcu_dyntick(TPS("End"), rdtp->dynticks_nesting, newval, rdtp->dynticks);
- if (IS_ENABLED(CONFIG_RCU_EQS_DEBUG) &&
- !user && !is_idle_task(current)) {
- struct task_struct *idle __maybe_unused =
- idle_task(smp_processor_id());
-
- trace_rcu_dyntick(TPS("Error on exit: not idle task"), rdtp->dynticks_nesting, newval, rdtp->dynticks);
- rcu_ftrace_dump(DUMP_ORIG);
- WARN_ONCE(1, "Current pid: %d comm: %s / Idle pid: %d comm: %s",
- current->pid, current->comm,
- idle->pid, idle->comm); /* must be idle task! */
- }
-}
-
-/*
* Exit an RCU extended quiescent state, which can be either the
* idle loop or adaptive-tickless usermode execution.
*
@@ -963,11 +935,25 @@ static void rcu_eqs_exit(bool user)
WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && oldval < 0);
if (oldval) {
rdtp->dynticks_nesting++;
- } else {
- rcu_eqs_exit_common(1, user);
- WRITE_ONCE(rdtp->dynticks_nesting, 1);
- WRITE_ONCE(rdtp->dynticks_nmi_nesting, DYNTICK_IRQ_NONIDLE);
+ return;
+ }
+ rcu_dynticks_task_exit();
+ rcu_dynticks_eqs_exit();
+ rcu_cleanup_after_idle();
+ trace_rcu_dyntick(TPS("End"), rdtp->dynticks_nesting, 1, rdtp->dynticks);
+ if (IS_ENABLED(CONFIG_RCU_EQS_DEBUG) &&
+ !user && !is_idle_task(current)) {
+ struct task_struct *idle __maybe_unused =
+ idle_task(smp_processor_id());
+
+ trace_rcu_dyntick(TPS("Error on exit: not idle task"), rdtp->dynticks_nesting, 1, rdtp->dynticks);
+ rcu_ftrace_dump(DUMP_ORIG);
+ WARN_ONCE(1, "Current pid: %d comm: %s / Idle pid: %d comm: %s",
+ current->pid, current->comm,
+ idle->pid, idle->comm); /* must be idle task! */
}
+ WRITE_ONCE(rdtp->dynticks_nesting, 1);
+ WRITE_ONCE(rdtp->dynticks_nmi_nesting, DYNTICK_IRQ_NONIDLE);
}
/**
--
2.5.2
next prev parent reply other threads:[~2017-12-01 19:38 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-01 19:36 [PATCH tip/core/rcu 0/17] RCU dyntick updates for v4.16 Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 01/17] rcu: Avoid ->dynticks_nmi_nesting store tearing Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 02/17] rcu: Reduce dyntick-idle state space Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 03/17] rcu: Move rcu_nmi_{enter,exit}() to prepare for consolidation Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 04/17] rcu: Clamp ->dynticks_nmi_nesting at eqs entry/exit Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 05/17] rcu: Define rcu_irq_{enter,exit}() in terms of rcu_nmi_{enter,exit}() Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 06/17] rcu: Make ->dynticks_nesting be a simple counter Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 07/17] rcu: Eliminate rcu_irq_enter_disabled() Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 08/17] rcu: Add tracing to irq/NMI dyntick-idle transitions Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 09/17] rcu: Shrink ->dynticks_{nmi_,}nesting from long long to long Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 10/17] rcu: Add ->dynticks field to rcu_dyntick trace event Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 11/17] rcu: Stop duplicating lockdep checks in RCU's idle-entry code Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 12/17] rcu: Avoid ->dynticks_nesting store tearing Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 13/17] rcu: Fold rcu_eqs_enter_common() into rcu_eqs_enter() Paul E. McKenney
2017-12-01 19:36 ` Paul E. McKenney [this message]
2017-12-01 19:36 ` [PATCH tip/core/rcu 15/17] rcu: Simplify rcu_eqs_{enter,exit}() non-idle task debug code Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 16/17] doc: Update dyntick-idle design documentation for NMI/irq consolidation Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 17/17] tracing, rcu: Remove no longer used trace event rcu_prep_idle Paul E. McKenney
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