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

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 #ifndef __ASM_VDSO_PROCESSOR_H
   3 #define __ASM_VDSO_PROCESSOR_H
   4
   5 #ifndef __ASSEMBLY__
   6
   7 #include <asm/barrier.h>
   8
   9 static inline void cpu_relax(void)
  10 {
  11 #ifdef __riscv_muldiv
  12         int dummy;
  13         /* In lieu of a halt instruction, induce a long-latency stall. */
  14         __asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy));
  15 #endif
  16         barrier();
  17 }
  18
  19 #endif /* __ASSEMBLY__ */
  20
  21 #endif /* __ASM_VDSO_PROCESSOR_H */