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