arch/arm/include/asm/vdso/processor.h

   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 */