以下提交将其删除:

commit 303395ac3bf3e2cb488435537d416bc840438fcb
Author: H. Peter Anvin <hpa@linux.intel.com>
Date:   Fri Nov 11 16:07:41 2011 -0800

    x86: Generate system call tables and unistd_*.h from tables

    Generate system call tables and unistd_*.h automatically from the
    tables in arch/x86/syscalls.  All other information, like NR_syscalls,
    is auto-generated, some of which is in asm-offsets_*.c.

    This allows us to keep all the system call information in one place,
    and allows for kernel space and user space to see different
    information; this is currently used for the ia32 system call numbers
    when building the 64-bit kernel, but will be used by the x32 ABI in
    the near future.

    This also removes some gratuitious differences between i386, x86-64
    and ia32; in particular, now all system call tables are generated with
    the same mechanism.

因为现在syscall表是由脚本arch/x86/syscalls/syscalltbl.sh生成的，基于arch/x86/syscalls/syscall_{32,64}.tbl.

because now syscall table is generated by the script arch/x86/syscalls/syscalltbl.sh, based on arch/x86/syscalls/syscall_{32,64}.tbl.