asm/vdso/processor.h

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 /*
0003  * Copyright (C) 2020 ARM Ltd.
0004  */
0005 #ifndef __ASM_VDSO_PROCESSOR_H
0006 #define __ASM_VDSO_PROCESSOR_H
0007
0008 #ifndef __ASSEMBLY__
0009
0010 #if __LINUX_ARM_ARCH__ == 6 || defined(CONFIG_ARM_ERRATA_754327)
0011 #define cpu_relax()                     \
0012     do {                            \
0013         smp_mb();                   \
0014         __asm__ __volatile__("nop; nop; nop; nop; nop; nop; nop; nop; nop; nop;");  \
0015     } while (0)
0016 #else
0017 #define cpu_relax()         barrier()
0018 #endif
0019
0020 #endif /* __ASSEMBLY__ */
0021
0022 #endif /* __ASM_VDSO_PROCESSOR_H */