diff options
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 13 | ||||
| -rw-r--r-- | init/version.c | 17 |
2 files changed, 30 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 2522b11e593f..2c9c0229b770 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1667,6 +1667,19 @@ hlt [BUGS=ARM,SH] + hostname= [KNL] Set the hostname (aka UTS nodename). + Format: <string> + This allows setting the system's hostname during early + startup. This sets the name returned by gethostname. + Using this parameter to set the hostname makes it + possible to ensure the hostname is correctly set before + any userspace processes run, avoiding the possibility + that a process may call gethostname before the hostname + has been explicitly set, resulting in the calling + process getting an incorrect result. The string must + not exceed the maximum allowed hostname length (usually + 64 characters) and will be truncated otherwise. + hpet= [X86-32,HPET] option to control HPET usage Format: { enable (default) | disable | force | verbose } diff --git a/init/version.c b/init/version.c index 1a356f5493e8..b7f9559d417c 100644 --- a/init/version.c +++ b/init/version.c @@ -11,6 +11,8 @@ #include <linux/build-salt.h> #include <linux/elfnote-lto.h> #include <linux/export.h> +#include <linux/init.h> +#include <linux/printk.h> #include <linux/uts.h> #include <linux/utsname.h> #include <generated/utsrelease.h> @@ -35,6 +37,21 @@ struct uts_namespace init_uts_ns = { }; EXPORT_SYMBOL_GPL(init_uts_ns); +static int __init early_hostname(char *arg) +{ + size_t bufsize = sizeof(init_uts_ns.name.nodename); + size_t maxlen = bufsize - 1; + size_t arglen; + + arglen = strlcpy(init_uts_ns.name.nodename, arg, bufsize); + if (arglen > maxlen) { + pr_warn("hostname parameter exceeds %zd characters and will be truncated", + maxlen); + } + return 0; +} +early_param("hostname", early_hostname); + /* FIXED STRINGS! Don't touch! */ const char linux_banner[] = "Linux version " UTS_RELEASE " (" LINUX_COMPILE_BY "@" |