1. 根目录:
2. arch
3. x86
4. include
5. uapi
6. asm
7. siginfo.h

#ifndef _ASM_X86_SIGINFO_H
#define _ASM_X86_SIGINFO_H

#ifdef __x86_64__
# ifdef __ILP32__ /* x32 */
typedef long long __kernel_si_clock_t __attribute__((aligned(4)));
#  define __ARCH_SI_CLOCK_T		__kernel_si_clock_t
#  define __ARCH_SI_ATTRIBUTES		__attribute__((aligned(8)))
# else /* x86-64 */
#  define __ARCH_SI_PREAMBLE_SIZE	(4 * sizeof(int))
# endif
#endif

#include <asm-generic/siginfo.h>

#endif /* _ASM_X86_SIGINFO_H */