diff options
Diffstat (limited to 'arch/riscv/include/asm/spinlock.h')
| -rw-r--r-- | arch/riscv/include/asm/spinlock.h | 44 |
1 files changed, 4 insertions, 40 deletions
diff --git a/arch/riscv/include/asm/spinlock.h b/arch/riscv/include/asm/spinlock.h index f4f7fa1b7ca8..88a4d5d0d98a 100644 --- a/arch/riscv/include/asm/spinlock.h +++ b/arch/riscv/include/asm/spinlock.h @@ -7,49 +7,13 @@ #ifndef _ASM_RISCV_SPINLOCK_H #define _ASM_RISCV_SPINLOCK_H +/* This is horible, but the whole file is going away in the next commit. */ +#define __ASM_GENERIC_QRWLOCK_H + #include <linux/kernel.h> #include <asm/current.h> #include <asm/fence.h> - -/* - * Simple spin lock operations. These provide no fairness guarantees. - */ - -/* FIXME: Replace this with a ticket lock, like MIPS. */ - -#define arch_spin_is_locked(x) (READ_ONCE((x)->lock) != 0) - -static inline void arch_spin_unlock(arch_spinlock_t *lock) -{ - smp_store_release(&lock->lock, 0); -} - -static inline int arch_spin_trylock(arch_spinlock_t *lock) -{ - int tmp = 1, busy; - - __asm__ __volatile__ ( - " amoswap.w %0, %2, %1\n" - RISCV_ACQUIRE_BARRIER - : "=r" (busy), "+A" (lock->lock) - : "r" (tmp) - : "memory"); - - return !busy; -} - -static inline void arch_spin_lock(arch_spinlock_t *lock) -{ - while (1) { - if (arch_spin_is_locked(lock)) - continue; - - if (arch_spin_trylock(lock)) - break; - } -} - -/***********************************************************/ +#include <asm-generic/spinlock.h> static inline void arch_read_lock(arch_rwlock_t *lock) { |