1. 根目录:
2. arch
3. s390
4. include
5. asm
6. mutex.h

/*
 * Pull in the generic implementation for the mutex fastpath.
 *
 * TODO: implement optimized primitives instead, or leave the generic
 * implementation in place, or pick the atomic_xchg() based generic
 * implementation. (see asm-generic/mutex-xchg.h for details)
 */

#include <asm-generic/mutex-dec.h>

#define arch_mutex_cpu_relax()	barrier()