init/version.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/init/version.c
   4  *
   5  *  Copyright (C) 1992  Theodore Ts'o
   6  *
   7  *  May be freely distributed as part of Linux.
   8  */
   9
  10 #include <generated/compile.h>
  11 #include <linux/build-salt.h>
  12 #include <linux/elfnote-lto.h>
  13 #include <linux/export.h>
  14 #include <linux/init.h>
  15 #include <linux/printk.h>
  16 #include <linux/uts.h>
  17 #include <linux/utsname.h>
  18 #include <linux/proc_ns.h>
  19
  20 static int __init early_hostname(char *arg)
  21 {
  22         size_t bufsize = sizeof(init_uts_ns.name.nodename);
  23         size_t maxlen  = bufsize - 1;
  24         ssize_t arglen;
  25
  26         arglen = strscpy(init_uts_ns.name.nodename, arg, bufsize);
  27         if (arglen < 0) {
  28                 pr_warn("hostname parameter exceeds %zd characters and will be truncated",
  29                         maxlen);
  30         }
  31         return 0;
  32 }
  33 early_param("hostname", early_hostname);
  34
  35 const char linux_proc_banner[] =
  36         "%s version %s"
  37         " (" LINUX_COMPILE_BY "@" LINUX_COMPILE_HOST ")"
  38         " (" LINUX_COMPILER ") %s\n";
  39
  40 BUILD_SALT;
  41 BUILD_LTO_INFO;
  42
  43 /*
  44  * init_uts_ns and linux_banner contain the build version and timestamp,
  45  * which are really fixed at the very last step of build process.
  46  * They are compiled with __weak first, and without __weak later.
  47  */
  48
  49 struct uts_namespace init_uts_ns __weak;
  50 const char linux_banner[] __weak;
  51
  52 #include "version-timestamp.c"
  53
  54 EXPORT_SYMBOL_GPL(init_uts_ns);