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locking/spinlock: Provide RT variant header: <linux/spinlock_rt.h>

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Provide the necessary wrappers around the actual rtmutex based spinlock
implementation.

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/20210815211303.712897671@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-08-15 23:28:23 +02:00 • committed by Ingo Molnar
parent 051790eecc
commit 342a93247e
3 changed files with 162 additions and 1 deletions
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11
include/linux/spinlock.h
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@ -312,8 +312,10 @@ static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock)
1 : ({ local_irq_restore(flags); 0; }); \
})
/* Include rwlock functions */
#ifndef CONFIG_PREEMPT_RT
/* Include rwlock functions for !RT */
#include <linux/rwlock.h>
#endif
/*
* Pull the _spin_*()/_read_*()/_write_*() functions/declarations:
@ -324,6 +326,9 @@ static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock)
# include <linux/spinlock_api_up.h>
#endif
/* Non PREEMPT_RT kernel, map to raw spinlocks: */
#ifndef CONFIG_PREEMPT_RT
/*
* Map the spin_lock functions to the raw variants for PREEMPT_RT=n
*/
@ -458,6 +463,10 @@ static __always_inline int spin_is_contended(spinlock_t *lock)
#define assert_spin_locked(lock) assert_raw_spin_locked(&(lock)->rlock)
#else /* !CONFIG_PREEMPT_RT */
# include <linux/spinlock_rt.h>
#endif /* CONFIG_PREEMPT_RT */
/*
* Pull the atomic_t declaration:
* (asm-mips/atomic.h needs above definitions)