diff options
Diffstat (limited to 'include/linux/spinlock.h')
| -rw-r--r-- | include/linux/spinlock.h | 71 |
1 files changed, 44 insertions, 27 deletions
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h index 031ce8617df8..1341f7d62da4 100644 --- a/include/linux/spinlock.h +++ b/include/linux/spinlock.h @@ -1,6 +1,7 @@ /* SPDX-License-Identifier: GPL-2.0 */ #ifndef __LINUX_SPINLOCK_H #define __LINUX_SPINLOCK_H +#define __LINUX_INSIDE_SPINLOCK_H /* * include/linux/spinlock.h - generic spinlock/rwlock declarations @@ -12,6 +13,8 @@ * asm/spinlock_types.h: contains the arch_spinlock_t/arch_rwlock_t and the * initializers * + * linux/spinlock_types_raw: + * The raw types and initializers * linux/spinlock_types.h: * defines the generic type and initializers * @@ -31,6 +34,8 @@ * contains the generic, simplified UP spinlock type. * (which is an empty structure on non-debug builds) * + * linux/spinlock_types_raw: + * The raw RT types and initializers * linux/spinlock_types.h: * defines the generic type and initializers * @@ -53,9 +58,9 @@ #include <linux/compiler.h> #include <linux/irqflags.h> #include <linux/thread_info.h> -#include <linux/kernel.h> #include <linux/stringify.h> #include <linux/bottom_half.h> +#include <linux/lockdep.h> #include <asm/barrier.h> #include <asm/mmiowb.h> @@ -75,7 +80,7 @@ #define LOCK_SECTION_END \ ".previous\n\t" -#define __lockfunc __attribute__((section(".spinlock.text"))) +#define __lockfunc __section(".spinlock.text") /* * Pull the arch_spinlock_t and arch_rwlock_t definitions: @@ -93,12 +98,13 @@ #ifdef CONFIG_DEBUG_SPINLOCK extern void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name, - struct lock_class_key *key); -# define raw_spin_lock_init(lock) \ -do { \ - static struct lock_class_key __key; \ - \ - __raw_spin_lock_init((lock), #lock, &__key); \ + struct lock_class_key *key, short inner); + +# define raw_spin_lock_init(lock) \ +do { \ + static struct lock_class_key __key; \ + \ + __raw_spin_lock_init((lock), #lock, &__key, LD_WAIT_SPIN); \ } while (0) #else @@ -166,12 +172,11 @@ do { \ * Architectures that can implement ACQUIRE better need to take care. */ #ifndef smp_mb__after_spinlock -#define smp_mb__after_spinlock() do { } while (0) +#define smp_mb__after_spinlock() kcsan_mb() #endif #ifdef CONFIG_DEBUG_SPINLOCK extern void do_raw_spin_lock(raw_spinlock_t *lock) __acquires(lock); -#define do_raw_spin_lock_flags(lock, flags) do_raw_spin_lock(lock) extern int do_raw_spin_trylock(raw_spinlock_t *lock); extern void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock); #else @@ -182,18 +187,6 @@ static inline void do_raw_spin_lock(raw_spinlock_t *lock) __acquires(lock) mmiowb_spin_lock(); } -#ifndef arch_spin_lock_flags -#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock) -#endif - -static inline void -do_raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long *flags) __acquires(lock) -{ - __acquire(lock); - arch_spin_lock_flags(&lock->raw_lock, *flags); - mmiowb_spin_lock(); -} - static inline int do_raw_spin_trylock(raw_spinlock_t *lock) { int ret = arch_spin_trylock(&(lock)->raw_lock); @@ -306,8 +299,10 @@ 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: @@ -318,6 +313,9 @@ 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 */ @@ -327,12 +325,26 @@ static __always_inline raw_spinlock_t *spinlock_check(spinlock_t *lock) return &lock->rlock; } -#define spin_lock_init(_lock) \ -do { \ - spinlock_check(_lock); \ - raw_spin_lock_init(&(_lock)->rlock); \ +#ifdef CONFIG_DEBUG_SPINLOCK + +# define spin_lock_init(lock) \ +do { \ + static struct lock_class_key __key; \ + \ + __raw_spin_lock_init(spinlock_check(lock), \ + #lock, &__key, LD_WAIT_CONFIG); \ } while (0) +#else + +# define spin_lock_init(_lock) \ +do { \ + spinlock_check(_lock); \ + *(_lock) = __SPIN_LOCK_UNLOCKED(_lock); \ +} while (0) + +#endif + static __always_inline void spin_lock(spinlock_t *lock) { raw_spin_lock(&lock->rlock); @@ -438,6 +450,10 @@ 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) @@ -477,4 +493,5 @@ int __alloc_bucket_spinlocks(spinlock_t **locks, unsigned int *lock_mask, void free_bucket_spinlocks(spinlock_t *locks); +#undef __LINUX_INSIDE_SPINLOCK_H #endif /* __LINUX_SPINLOCK_H */ |