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- /* SPDX-License-Identifier: GPL-2.0 */
- #ifndef _ASM_UM_BARRIER_H_
- #define _ASM_UM_BARRIER_H_
- #include <asm/cpufeatures.h>
- #include <asm/alternative.h>
- /*
- * Force strict CPU ordering.
- * And yes, this is required on UP too when we're talking
- * to devices.
- */
- #ifdef CONFIG_X86_32
- #define mb() alternative("lock; addl $0,0(%%esp)", "mfence", X86_FEATURE_XMM2)
- #define rmb() alternative("lock; addl $0,0(%%esp)", "lfence", X86_FEATURE_XMM2)
- #define wmb() alternative("lock; addl $0,0(%%esp)", "sfence", X86_FEATURE_XMM)
- #else /* CONFIG_X86_32 */
- #define mb() asm volatile("mfence" : : : "memory")
- #define rmb() asm volatile("lfence" : : : "memory")
- #define wmb() asm volatile("sfence" : : : "memory")
- #endif /* CONFIG_X86_32 */
- #include <asm-generic/barrier.h>
- #endif
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