[PATCH] kthread: convert arch/i386/kernel/apm.c

Convert i386 apm.c from kernel_thread(), whose export is deprecated, to
kthread API.
Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/kernel/apm.c

@@ -225,6 +225,7 @@
 #include <linux/smp_lock.h>
 #include <linux/dmi.h>
 #include <linux/suspend.h>
+#include <linux/kthread.h>
 
 #include <asm/system.h>
 #include <asm/uaccess.h>
@@ -402,8 +403,6 @@ static int			realmode_power_off = 1;
 #else
 static int			realmode_power_off;
 #endif
-static int			exit_kapmd __read_mostly;
-static int			kapmd_running __read_mostly;
 #ifdef CONFIG_APM_ALLOW_INTS
 static int			allow_ints = 1;
 #else
@@ -419,6 +418,8 @@ static const struct desc_struct	bad_bios_desc = { 0, 0x00409200 };
 
 static const char		driver_version[] = "1.16ac";	/* no spaces */
 
+static struct task_struct *kapmd_task;
+
 /*
  *	APM event names taken from the APM 1.2 specification. These are
  *	the message codes that the BIOS uses to tell us about events
@@ -1423,7 +1424,7 @@ static void apm_mainloop(void)
 	set_current_state(TASK_INTERRUPTIBLE);
 	for (;;) {
 		schedule_timeout(APM_CHECK_TIMEOUT);
-		if (exit_kapmd)
+		if (kthread_should_stop())
 			break;
 		/*
 		 * Ok, check all events, check for idle (and mark us sleeping
@@ -1706,12 +1707,6 @@ static int apm(void *unused)
 	char *		power_stat;
 	char *		bat_stat;
 
-	kapmd_running = 1;
-
-	daemonize("kapmd");
-
-	current->flags |= PF_NOFREEZE;
-
 #ifdef CONFIG_SMP
 	/* 2002/08/01 - WT
 	 * This is to avoid random crashes at boot time during initialization
@@ -1821,7 +1816,6 @@ static int apm(void *unused)
 		console_blank_hook = NULL;
 #endif
 	}
-	kapmd_running = 0;
 
 	return 0;
 }
@@ -2220,7 +2214,7 @@ static int __init apm_init(void)
 {
 	struct proc_dir_entry *apm_proc;
 	struct desc_struct *gdt;
-	int ret;
+	int err;
 
 	dmi_check_system(apm_dmi_table);
 
@@ -2329,12 +2323,17 @@ static int __init apm_init(void)
 	if (apm_proc)
 		apm_proc->owner = THIS_MODULE;
 
-	ret = kernel_thread(apm, NULL, CLONE_KERNEL | SIGCHLD);
-	if (ret < 0) {
-		printk(KERN_ERR "apm: disabled - Unable to start kernel thread.\n");
+	kapmd_task = kthread_create(apm, NULL, "kapmd");
+	if (IS_ERR(kapmd_task)) {
+		printk(KERN_ERR "apm: disabled - Unable to start kernel "
+				"thread.\n");
+		err = PTR_ERR(kapmd_task);
+		kapmd_task = NULL;
 		remove_proc_entry("apm", NULL);
-		return -ENOMEM;
+		return err;
 	}
+	kapmd_task->flags |= PF_NOFREEZE;
+	wake_up_process(kapmd_task);
 
 	if (num_online_cpus() > 1 && !smp ) {
 		printk(KERN_NOTICE
@@ -2384,9 +2383,10 @@ static void __exit apm_exit(void)
 	remove_proc_entry("apm", NULL);
 	if (power_off)
 		pm_power_off = NULL;
-	exit_kapmd = 1;
-	while (kapmd_running)
-		schedule();
+	if (kapmd_task) {
+		kthread_stop(kapmd_task);
+		kapmd_task = NULL;
+	}
 #ifdef CONFIG_PM_LEGACY
 	pm_active = 0;
 #endif