1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Copyright (C) 2020 ARM Ltd. 4*4882a593Smuzhiyun */ 5*4882a593Smuzhiyun #ifndef __ASM_VDSO_PROCESSOR_H 6*4882a593Smuzhiyun #define __ASM_VDSO_PROCESSOR_H 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun #ifndef __ASSEMBLY__ 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327) 11*4882a593Smuzhiyun #define cpu_relax() \ 12*4882a593Smuzhiyun do { \ 13*4882a593Smuzhiyun smp_mb(); \ 14*4882a593Smuzhiyun __asm__ __volatile__("nop; nop; nop; nop; nop; nop; nop; nop; nop; nop;"); \ 15*4882a593Smuzhiyun } while (0) 16*4882a593Smuzhiyun #else 17*4882a593Smuzhiyun #define cpu_relax() barrier() 18*4882a593Smuzhiyun #endif 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun #endif /* __ASSEMBLY__ */ 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun #endif /* __ASM_VDSO_PROCESSOR_H */ 23