diff options
| -rw-r--r-- | Documentation/kernel-parameters.txt | 5 | ||||
| -rw-r--r-- | init/main.c | 31 |
2 files changed, 32 insertions, 4 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 3d5cd7a09b2f..d2f0c67ba1fb 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1174,6 +1174,11 @@ running once the system is up. New name for the ramdisk parameter. See Documentation/ramdisk.txt. + rdinit= [KNL] + Format: <full_path> + Run specified binary instead of /init from the ramdisk, + used for early userspace startup. See initrd. + reboot= [BUGS=IA-32,BUGS=ARM,BUGS=IA-64] Rebooting mode Format: <reboot_mode>[,<reboot_mode2>[,...]] See arch/*/kernel/reboot.c. diff --git a/init/main.c b/init/main.c index e4dbcbcd26cf..f142d4035341 100644 --- a/init/main.c +++ b/init/main.c @@ -123,6 +123,7 @@ extern void softirq_init(void); char saved_command_line[COMMAND_LINE_SIZE]; static char *execute_command; +static char *ramdisk_execute_command; /* Setup configured maximum number of CPUs to activate */ static unsigned int max_cpus = NR_CPUS; @@ -297,6 +298,18 @@ static int __init init_setup(char *str) } __setup("init=", init_setup); +static int __init rdinit_setup(char *str) +{ + unsigned int i; + + ramdisk_execute_command = str; + /* See "auto" comment in init_setup */ + for (i = 1; i < MAX_INIT_ARGS; i++) + argv_init[i] = NULL; + return 1; +} +__setup("rdinit=", rdinit_setup); + extern void setup_arch(char **); #ifndef CONFIG_SMP @@ -681,10 +694,14 @@ static int init(void * unused) * check if there is an early userspace init. If yes, let it do all * the work */ - if (sys_access((const char __user *) "/init", 0) == 0) - execute_command = "/init"; - else + + if (!ramdisk_execute_command) + ramdisk_execute_command = "/init"; + + if (sys_access((const char __user *) ramdisk_execute_command, 0) != 0) { + ramdisk_execute_command = NULL; prepare_namespace(); + } /* * Ok, we have completed the initial bootup, and @@ -701,7 +718,13 @@ static int init(void * unused) (void) sys_dup(0); (void) sys_dup(0); - + + if (ramdisk_execute_command) { + run_init_process(ramdisk_execute_command); + printk(KERN_WARNING "Failed to execute %s\n", + ramdisk_execute_command); + } + /* * We try each of these until one succeeds. * |