1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_QSPINLOCK_H 3 #define _ASM_X86_QSPINLOCK_H 4 5 #include <linux/jump_label.h> 6 #include <asm/cpufeature.h> 7 #include <asm-generic/qspinlock_types.h> 8 #include <asm/paravirt.h> 9 #include <asm/rmwcc.h> 10 #ifdef CONFIG_PARAVIRT 11 #include <asm/paravirt-spinlock.h> 12 #endif 13 14 #define _Q_PENDING_LOOPS (1 << 9) 15 16 #define queued_fetch_set_pending_acquire queued_fetch_set_pending_acquire 17 static __always_inline u32 queued_fetch_set_pending_acquire(struct qspinlock *lock) 18 { 19 u32 val; 20 21 /* 22 * We can't use GEN_BINARY_RMWcc() inside an if() stmt because asm goto 23 * and CONFIG_PROFILE_ALL_BRANCHES=y results in a label inside a 24 * statement expression, which GCC doesn't like. 25 */ 26 val = GEN_BINARY_RMWcc(LOCK_PREFIX "btsl", lock->val.counter, c, 27 "I", _Q_PENDING_OFFSET) * _Q_PENDING_VAL; 28 val |= atomic_read(&lock->val) & ~_Q_PENDING_MASK; 29 30 return val; 31 } 32 33 #ifndef CONFIG_PARAVIRT 34 static inline void native_pv_lock_init(void) { } 35 #endif 36 37 #include <asm-generic/qspinlock.h> 38 39 #endif /* _ASM_X86_QSPINLOCK_H */ 40