arch/x86/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 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
  11 static __always_inline void rep_nop(void)
  12 {
  13         asm volatile("rep; nop" ::: "memory");
  14 }
  15
  16 static __always_inline void cpu_relax(void)
  17 {
  18         rep_nop();
  19 }
  20
  21 #endif /* __ASSEMBLY__ */
  22
  23 #endif /* __ASM_VDSO_PROCESSOR_H */