/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_X86_CMPXCHG_32_H #define _ASM_X86_CMPXCHG_32_H /* * Note: if you use __cmpxchg64(), or their variants, * you need to test for the feature in boot_cpu_data. */ __u64_halves; #define __arch_cmpxchg64(_ptr, _old, _new, _lock) … static __always_inline u64 __cmpxchg64(volatile u64 *ptr, u64 old, u64 new) { … } static __always_inline u64 __cmpxchg64_local(volatile u64 *ptr, u64 old, u64 new) { … } #define __arch_try_cmpxchg64(_ptr, _oldp, _new, _lock) … static __always_inline bool __try_cmpxchg64(volatile u64 *ptr, u64 *oldp, u64 new) { … } static __always_inline bool __try_cmpxchg64_local(volatile u64 *ptr, u64 *oldp, u64 new) { … } #ifdef CONFIG_X86_CMPXCHG64 #define arch_cmpxchg64 … #define arch_cmpxchg64_local … #define arch_try_cmpxchg64 … #define arch_try_cmpxchg64_local … #else /* * Building a kernel capable running on 80386 and 80486. It may be necessary * to simulate the cmpxchg8b on the 80386 and 80486 CPU. */ #define __arch_cmpxchg64_emu … static __always_inline u64 arch_cmpxchg64(volatile u64 *ptr, u64 old, u64 new) { return __arch_cmpxchg64_emu(ptr, old, new, LOCK_PREFIX_HERE, "lock; "); } #define arch_cmpxchg64 … static __always_inline u64 arch_cmpxchg64_local(volatile u64 *ptr, u64 old, u64 new) { return __arch_cmpxchg64_emu(ptr, old, new, ,); } #define arch_cmpxchg64_local … #define __arch_try_cmpxchg64_emu … static __always_inline bool arch_try_cmpxchg64(volatile u64 *ptr, u64 *oldp, u64 new) { return __arch_try_cmpxchg64_emu(ptr, oldp, new, LOCK_PREFIX_HERE, "lock; "); } #define arch_try_cmpxchg64 … static __always_inline bool arch_try_cmpxchg64_local(volatile u64 *ptr, u64 *oldp, u64 new) { return __arch_try_cmpxchg64_emu(ptr, oldp, new, ,); } #define arch_try_cmpxchg64_local … #endif #define system_has_cmpxchg64() … #endif /* _ASM_X86_CMPXCHG_32_H */
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