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026659b977
On PREEMPT_RT enabled kernels local_lock maps to a per CPU 'sleeping' spinlock which protects the critical section while staying preemptible. CPU locality is established by disabling migration. Provide the necessary types and macros to substitute the non-RT variant. Co-developed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20210815211306.023630962@linutronix.de
142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_LOCAL_LOCK_H
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# error "Do not include directly, include linux/local_lock.h"
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#endif
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#include <linux/percpu-defs.h>
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#include <linux/lockdep.h>
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#ifndef CONFIG_PREEMPT_RT
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typedef struct {
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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struct lockdep_map dep_map;
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struct task_struct *owner;
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#endif
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} local_lock_t;
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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# define LOCAL_LOCK_DEBUG_INIT(lockname) \
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.dep_map = { \
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.name = #lockname, \
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.wait_type_inner = LD_WAIT_CONFIG, \
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.lock_type = LD_LOCK_PERCPU, \
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}, \
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.owner = NULL,
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static inline void local_lock_acquire(local_lock_t *l)
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{
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lock_map_acquire(&l->dep_map);
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DEBUG_LOCKS_WARN_ON(l->owner);
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l->owner = current;
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}
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static inline void local_lock_release(local_lock_t *l)
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{
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DEBUG_LOCKS_WARN_ON(l->owner != current);
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l->owner = NULL;
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lock_map_release(&l->dep_map);
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}
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static inline void local_lock_debug_init(local_lock_t *l)
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{
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l->owner = NULL;
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}
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#else /* CONFIG_DEBUG_LOCK_ALLOC */
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# define LOCAL_LOCK_DEBUG_INIT(lockname)
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static inline void local_lock_acquire(local_lock_t *l) { }
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static inline void local_lock_release(local_lock_t *l) { }
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static inline void local_lock_debug_init(local_lock_t *l) { }
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#endif /* !CONFIG_DEBUG_LOCK_ALLOC */
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#define INIT_LOCAL_LOCK(lockname) { LOCAL_LOCK_DEBUG_INIT(lockname) }
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#define __local_lock_init(lock) \
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do { \
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static struct lock_class_key __key; \
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\
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debug_check_no_locks_freed((void *)lock, sizeof(*lock));\
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lockdep_init_map_type(&(lock)->dep_map, #lock, &__key, \
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0, LD_WAIT_CONFIG, LD_WAIT_INV, \
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LD_LOCK_PERCPU); \
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local_lock_debug_init(lock); \
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} while (0)
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#define __local_lock(lock) \
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do { \
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preempt_disable(); \
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local_lock_acquire(this_cpu_ptr(lock)); \
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} while (0)
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#define __local_lock_irq(lock) \
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do { \
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local_irq_disable(); \
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local_lock_acquire(this_cpu_ptr(lock)); \
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} while (0)
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#define __local_lock_irqsave(lock, flags) \
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do { \
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local_irq_save(flags); \
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local_lock_acquire(this_cpu_ptr(lock)); \
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} while (0)
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#define __local_unlock(lock) \
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do { \
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local_lock_release(this_cpu_ptr(lock)); \
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preempt_enable(); \
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} while (0)
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#define __local_unlock_irq(lock) \
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do { \
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local_lock_release(this_cpu_ptr(lock)); \
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local_irq_enable(); \
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} while (0)
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#define __local_unlock_irqrestore(lock, flags) \
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do { \
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local_lock_release(this_cpu_ptr(lock)); \
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local_irq_restore(flags); \
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} while (0)
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#else /* !CONFIG_PREEMPT_RT */
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/*
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* On PREEMPT_RT local_lock maps to a per CPU spinlock, which protects the
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* critical section while staying preemptible.
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*/
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typedef spinlock_t local_lock_t;
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#define INIT_LOCAL_LOCK(lockname) __LOCAL_SPIN_LOCK_UNLOCKED((lockname))
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#define __local_lock_init(l) \
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do { \
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local_spin_lock_init((l)); \
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} while (0)
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#define __local_lock(__lock) \
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do { \
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migrate_disable(); \
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spin_lock(this_cpu_ptr((__lock))); \
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} while (0)
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#define __local_lock_irq(lock) __local_lock(lock)
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#define __local_lock_irqsave(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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flags = 0; \
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__local_lock(lock); \
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} while (0)
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#define __local_unlock(__lock) \
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do { \
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spin_unlock(this_cpu_ptr((__lock))); \
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migrate_enable(); \
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} while (0)
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#define __local_unlock_irq(lock) __local_unlock(lock)
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#define __local_unlock_irqrestore(lock, flags) __local_unlock(lock)
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#endif /* CONFIG_PREEMPT_RT */
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