* GK 2/5/95 - Changed to support mounting root fs via NFS
* Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96
* Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96
- * Simplified starting of init: Michael A. Griffith <grif@acm.org>
+ * Simplified starting of init: Michael A. Griffith <grif@acm.org>
*/
#define DEBUG /* Enable initcall_debug */
#include <linux/sched_clock.h>
#include <linux/context_tracking.h>
#include <linux/random.h>
+#include <linux/list.h>
#include <asm/io.h>
#include <asm/bugs.h>
* Used to generate warnings if static_key manipulation functions are used
* before jump_label_init is called.
*/
-bool static_key_initialized __read_mostly = false;
+bool static_key_initialized __read_mostly;
EXPORT_SYMBOL_GPL(static_key_initialized);
/*
__setup("reset_devices", set_reset_devices);
-static const char * argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
-const char * envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
+static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
+const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
static const char *panic_later, *panic_param;
extern const struct obs_kernel_param __setup_start[], __setup_end[];
* still work even if initially too large, it will just take slightly longer
*/
unsigned long loops_per_jiffy = (1<<12);
-
EXPORT_SYMBOL(loops_per_jiffy);
static int __init debug_kernel(char *str)
{
- console_loglevel = 10;
+ console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
return 0;
}
static int __init quiet_kernel(char *str)
{
- console_loglevel = 4;
+ console_loglevel = CONSOLE_LOGLEVEL_QUIET;
return 0;
}
return 0;
}
+/* Anything after -- gets handed straight to init. */
+static int __init set_init_arg(char *param, char *val, const char *unused)
+{
+ unsigned int i;
+
+ if (panic_later)
+ return 0;
+
+ repair_env_string(param, val, unused);
+
+ for (i = 0; argv_init[i]; i++) {
+ if (i == MAX_INIT_ARGS) {
+ panic_later = "init";
+ panic_param = param;
+ return 0;
+ }
+ }
+ argv_init[i] = param;
+ return 0;
+}
+
/*
* Unknown boot options get handed to init, unless they look like
* unused parameters (modprobe will find them in /proc/cmdline).
initcall_command_line =
memblock_virt_alloc(strlen(boot_command_line) + 1, 0);
static_command_line = memblock_virt_alloc(strlen(command_line) + 1, 0);
- strcpy (saved_command_line, boot_command_line);
- strcpy (static_command_line, command_line);
+ strcpy(saved_command_line, boot_command_line);
+ strcpy(static_command_line, command_line);
}
/*
* the init task will end up wanting to create kthreads, which, if
* we schedule it before we create kthreadd, will OOPS.
*/
- kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
+ kernel_thread(kernel_init, NULL, CLONE_FS);
numa_default_policy();
pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
rcu_read_lock();
/* Arch code calls this early on, or if not, just before other parsing. */
void __init parse_early_param(void)
{
- static __initdata int done = 0;
- static __initdata char tmp_cmdline[COMMAND_LINE_SIZE];
+ static int done __initdata;
+ static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
if (done)
return;
asmlinkage __visible void __init start_kernel(void)
{
- char * command_line;
+ char *command_line;
+ char *after_dashes;
extern const struct kernel_param __start___param[], __stop___param[];
/*
page_address_init();
pr_notice("%s", linux_banner);
setup_arch(&command_line);
- mm_init_owner(&init_mm, &init_task);
mm_init_cpumask(&init_mm);
setup_command_line(command_line);
setup_nr_cpu_ids();
pr_notice("Kernel command line: %s\n", boot_command_line);
parse_early_param();
- parse_args("Booting kernel", static_command_line, __start___param,
- __stop___param - __start___param,
- -1, -1, &unknown_bootoption);
+ after_dashes = parse_args("Booting kernel",
+ static_command_line, __start___param,
+ __stop___param - __start___param,
+ -1, -1, &unknown_bootoption);
+ if (after_dashes)
+ parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
+ set_init_arg);
jump_label_init();
* fragile until we cpu_idle() for the first time.
*/
preempt_disable();
- if (WARN(!irqs_disabled(), "Interrupts were enabled *very* early, fixing it\n"))
+ if (WARN(!irqs_disabled(),
+ "Interrupts were enabled *very* early, fixing it\n"))
local_irq_disable();
idr_init_cache();
rcu_init();
#ifdef CONFIG_X86
if (efi_enabled(EFI_RUNTIME_SERVICES))
efi_enter_virtual_mode();
+#endif
+#ifdef CONFIG_X86_ESPFIX64
+ /* Should be run before the first non-init thread is created */
+ init_espfix_bsp();
#endif
thread_info_cache_init();
cred_init();
signals_init();
/* rootfs populating might need page-writeback */
page_writeback_init();
-#ifdef CONFIG_PROC_FS
proc_root_init();
-#endif
cgroup_init();
cpuset_init();
taskstats_init_early();
bool initcall_debug;
core_param(initcall_debug, initcall_debug, bool, 0644);
+#ifdef CONFIG_KALLSYMS
+struct blacklist_entry {
+ struct list_head next;
+ char *buf;
+};
+
+static __initdata_or_module LIST_HEAD(blacklisted_initcalls);
+
+static int __init initcall_blacklist(char *str)
+{
+ char *str_entry;
+ struct blacklist_entry *entry;
+
+ /* str argument is a comma-separated list of functions */
+ do {
+ str_entry = strsep(&str, ",");
+ if (str_entry) {
+ pr_debug("blacklisting initcall %s\n", str_entry);
+ entry = alloc_bootmem(sizeof(*entry));
+ entry->buf = alloc_bootmem(strlen(str_entry) + 1);
+ strcpy(entry->buf, str_entry);
+ list_add(&entry->next, &blacklisted_initcalls);
+ }
+ } while (str_entry);
+
+ return 0;
+}
+
+static bool __init_or_module initcall_blacklisted(initcall_t fn)
+{
+ struct list_head *tmp;
+ struct blacklist_entry *entry;
+ char *fn_name;
+
+ fn_name = kasprintf(GFP_KERNEL, "%pf", fn);
+ if (!fn_name)
+ return false;
+
+ list_for_each(tmp, &blacklisted_initcalls) {
+ entry = list_entry(tmp, struct blacklist_entry, next);
+ if (!strcmp(fn_name, entry->buf)) {
+ pr_debug("initcall %s blacklisted\n", fn_name);
+ kfree(fn_name);
+ return true;
+ }
+ }
+
+ kfree(fn_name);
+ return false;
+}
+#else
+static int __init initcall_blacklist(char *str)
+{
+ pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n");
+ return 0;
+}
+
+static bool __init_or_module initcall_blacklisted(initcall_t fn)
+{
+ return false;
+}
+#endif
+__setup("initcall_blacklist=", initcall_blacklist);
+
static int __init_or_module do_one_initcall_debug(initcall_t fn)
{
ktime_t calltime, delta, rettime;
unsigned long long duration;
int ret;
- pr_debug("calling %pF @ %i\n", fn, task_pid_nr(current));
+ printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current));
calltime = ktime_get();
ret = fn();
rettime = ktime_get();
delta = ktime_sub(rettime, calltime);
duration = (unsigned long long) ktime_to_ns(delta) >> 10;
- pr_debug("initcall %pF returned %d after %lld usecs\n",
+ printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n",
fn, ret, duration);
return ret;
int ret;
char msgbuf[64];
+ if (initcall_blacklisted(fn))
+ return -EPERM;
+
if (initcall_debug)
ret = do_one_initcall_debug(fn);
else