linux-kernel - [PATCH 02/19] sched: Provide raw_spin_rq

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Date:   Thu, 22 Apr 2021 14:05:01 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     joel@...lfernandes.org, chris.hyser@...cle.com, joshdon@...gle.com,
        mingo@...nel.org, vincent.guittot@...aro.org,
        valentin.schneider@....com, mgorman@...e.de
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        tglx@...utronix.de
Subject: [PATCH 02/19] sched: Provide raw_spin_rq_*lock*() helpers

In prepration for playing games with rq->lock, add some rq_lock
wrappers.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 kernel/sched/core.c  |   15 +++++++++++++++
 kernel/sched/sched.h |   50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+)

--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -184,6 +184,21 @@ int sysctl_sched_rt_runtime = 950000;
  *
  */
 
+void raw_spin_rq_lock_nested(struct rq *rq, int subclass)
+{
+	raw_spin_lock_nested(rq_lockp(rq), subclass);
+}
+
+bool raw_spin_rq_trylock(struct rq *rq)
+{
+	return raw_spin_trylock(rq_lockp(rq));
+}
+
+void raw_spin_rq_unlock(struct rq *rq)
+{
+	raw_spin_unlock(rq_lockp(rq));
+}
+
 /*
  * __task_rq_lock - lock the rq @p resides on.
  */
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1113,6 +1113,56 @@ static inline bool is_migration_disabled
 #endif
 }
 
+static inline raw_spinlock_t *rq_lockp(struct rq *rq)
+{
+	return &rq->lock;
+}
+
+static inline void lockdep_assert_rq_held(struct rq *rq)
+{
+	lockdep_assert_held(rq_lockp(rq));
+}
+
+extern void raw_spin_rq_lock_nested(struct rq *rq, int subclass);
+extern bool raw_spin_rq_trylock(struct rq *rq);
+extern void raw_spin_rq_unlock(struct rq *rq);
+
+static inline void raw_spin_rq_lock(struct rq *rq)
+{
+	raw_spin_rq_lock_nested(rq, 0);
+}
+
+static inline void raw_spin_rq_lock_irq(struct rq *rq)
+{
+	local_irq_disable();
+	raw_spin_rq_lock(rq);
+}
+
+static inline void raw_spin_rq_unlock_irq(struct rq *rq)
+{
+	raw_spin_rq_unlock(rq);
+	local_irq_enable();
+}
+
+static inline unsigned long _raw_spin_rq_lock_irqsave(struct rq *rq)
+{
+	unsigned long flags;
+	local_irq_save(flags);
+	raw_spin_rq_lock(rq);
+	return flags;
+}
+
+static inline void raw_spin_rq_unlock_irqrestore(struct rq *rq, unsigned long flags)
+{
+	raw_spin_rq_unlock(rq);
+	local_irq_restore(flags);
+}
+
+#define raw_spin_rq_lock_irqsave(rq, flags)	\
+do {						\
+	flags = _raw_spin_rq_lock_irqsave(rq);	\
+} while (0)
+
 #ifdef CONFIG_SCHED_SMT
 extern void __update_idle_core(struct rq *rq);