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locking/local_lock: Add PREEMPT_RT support

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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
This commit is contained in:
Thomas Gleixner 2021-08-15 23:29:28 +02:00 committed by Ingo Molnar
parent 31552385f8
commit 026659b977
1 changed files with 44 additions and 0 deletions
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44
include/linux/local_lock_internal.h
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@ -6,6 +6,8 @@
#include <linux/percpu-defs.h>
#include <linux/lockdep.h>
#ifndef CONFIG_PREEMPT_RT
typedef struct {
#ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lockdep_map dep_map;
@ -95,3 +97,45 @@ do { \
local_lock_release(this_cpu_ptr(lock)); \
local_irq_restore(flags); \
} while (0)
#else /* !CONFIG_PREEMPT_RT */
/*
* On PREEMPT_RT local_lock maps to a per CPU spinlock, which protects the
* critical section while staying preemptible.
*/
typedef spinlock_t local_lock_t;
#define INIT_LOCAL_LOCK(lockname) __LOCAL_SPIN_LOCK_UNLOCKED((lockname))
#define __local_lock_init(l) \
do { \
local_spin_lock_init((l)); \
} while (0)
#define __local_lock(__lock) \
do { \
migrate_disable(); \
spin_lock(this_cpu_ptr((__lock))); \
} while (0)
#define __local_lock_irq(lock) __local_lock(lock)
#define __local_lock_irqsave(lock, flags) \
do { \
typecheck(unsigned long, flags); \
flags = 0; \
__local_lock(lock); \
} while (0)
#define __local_unlock(__lock) \
do { \
spin_unlock(this_cpu_ptr((__lock))); \
migrate_enable(); \
} while (0)
#define __local_unlock_irq(lock) __local_unlock(lock)
#define __local_unlock_irqrestore(lock, flags) __local_unlock(lock)
#endif /* CONFIG_PREEMPT_RT */