[PATCH] sched: disable preempt in idle tasks
[linux-2.6.git] / init / main.c
index a29fb2a..27f97f9 100644 (file)
@@ -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
@@ -381,14 +394,16 @@ static void noinline rest_init(void)
        kernel_thread(init, NULL, CLONE_FS | CLONE_SIGHAND);
        numa_default_policy();
        unlock_kernel();
-       preempt_enable_no_resched();
 
        /*
         * The boot idle thread must execute schedule()
         * at least one to get things moving:
         */
+       preempt_enable_no_resched();
        schedule();
+       preempt_disable();
 
+       /* Call into cpu_idle with preempt disabled */
        cpu_idle();
 } 
 
@@ -681,10 +696,14 @@ 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
@@ -701,17 +720,24 @@ 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.
         *
         * The Bourne shell can be used instead of init if we are 
         * trying to recover a really broken machine.
         */
-
-       if (execute_command)
+       if (execute_command) {
                run_init_process(execute_command);
-
+               printk(KERN_WARNING "Failed to execute %s.  Attempting "
+                                       "defaults...\n", execute_command);
+       }
        run_init_process("/sbin/init");
        run_init_process("/etc/init");
        run_init_process("/bin/init");