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sched: Provide raw_spin_rq_*lock*() helpers

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

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Don Hiatt <dhiatt@digitalocean.com>
Tested-by: Hongyu Ning <hongyu.ning@linux.intel.com>
Tested-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lkml.kernel.org/r/20210422123308.075967879@infradead.org
This commit is contained in:
Peter Zijlstra 2021-03-02 12:13:13 +01:00
parent 9099a14708
commit 39d371b7c0
2 changed files with 65 additions and 0 deletions
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15
kernel/sched/core.c
View file

@ -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.
*/

50
kernel/sched/sched.h
View file

@ -1113,6 +1113,56 @@ static inline bool is_migration_disabled(struct task_struct *p)
#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);