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Message-ID: <20070422193043.GA16567@infradead.org>
Date: Sun, 22 Apr 2007 20:30:43 +0100
From: Christoph Hellwig <hch@...radead.org>
To: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: "<Andrew Morton" <akpm@...l.org>, containers@...ts.osdl.org,
Oleg Nesterov <oleg@...sign.ru>,
Christoph Hellwig <hch@...radead.org>,
linux-kernel@...r.kernel.org, James.Bottomley@...senPartnership.com
Subject: Re: [PATCH] i386 voyager: Convert the monitor thread to use the kthread API
On Thu, Apr 19, 2007 at 12:55:27AM -0600, Eric W. Biederman wrote:
> From: Eric W. Biederman <ebiederm@...ssion.com> - unquoted
>
> This patch just trivially replaces kernel_thread and daemonize
> with a single call to kthread_run.
Here's a better patch that does the full kthread conversion +
switch to wake_up_process. Only compile tested of course due to
lack of voyager hardware.
Signed-off-by: Christoph Hellwig <hch@....de>
Index: linux-2.6/arch/i386/mach-voyager/voyager_cat.c
===================================================================
--- linux-2.6.orig/arch/i386/mach-voyager/voyager_cat.c 2007-04-22 15:19:28.000000000 +0200
+++ linux-2.6/arch/i386/mach-voyager/voyager_cat.c 2007-04-22 15:27:03.000000000 +0200
@@ -1111,7 +1111,7 @@ voyager_cat_do_common_interrupt(void)
printk(KERN_ERR "Voyager front panel switch turned off\n");
voyager_status.switch_off = 1;
voyager_status.request_from_kernel = 1;
- up(&kvoyagerd_sem);
+ wake_up_process(voyager_thread);
}
/* Tell the hardware we're taking care of the
* shutdown, otherwise it will power the box off
@@ -1157,7 +1157,7 @@ voyager_cat_do_common_interrupt(void)
outb(VOYAGER_CAT_END, CAT_CMD);
voyager_status.power_fail = 1;
voyager_status.request_from_kernel = 1;
- up(&kvoyagerd_sem);
+ wake_up_process(voyager_thread);
}
Index: linux-2.6/arch/i386/mach-voyager/voyager_thread.c
===================================================================
--- linux-2.6.orig/arch/i386/mach-voyager/voyager_thread.c 2007-04-22 15:15:24.000000000 +0200
+++ linux-2.6/arch/i386/mach-voyager/voyager_thread.c 2007-04-22 15:25:51.000000000 +0200
@@ -24,33 +24,16 @@
#include <linux/kmod.h>
#include <linux/completion.h>
#include <linux/sched.h>
+#include <linux/kthread.h>
#include <asm/desc.h>
#include <asm/voyager.h>
#include <asm/vic.h>
#include <asm/mtrr.h>
#include <asm/msr.h>
-#define THREAD_NAME "kvoyagerd"
-/* external variables */
-int kvoyagerd_running = 0;
-DECLARE_MUTEX_LOCKED(kvoyagerd_sem);
-
-static int thread(void *);
-
-static __u8 set_timeout = 0;
-
-/* Start the machine monitor thread. Return 1 if OK, 0 if fail */
-static int __init
-voyager_thread_start(void)
-{
- if(kernel_thread(thread, NULL, CLONE_KERNEL) < 0) {
- /* This is serious, but not fatal */
- printk(KERN_ERR "Voyager: Failed to create system monitor thread!!!\n");
- return 1;
- }
- return 0;
-}
+struct task_struct *voyager_thread;
+static __u8 set_timeout;
static int
execute(const char *string)
@@ -110,31 +93,15 @@ check_continuing_condition(void)
}
}
-static void
-wakeup(unsigned long unused)
-{
- up(&kvoyagerd_sem);
-}
-
static int
thread(void *unused)
{
- struct timer_list wakeup_timer;
-
- kvoyagerd_running = 1;
-
- daemonize(THREAD_NAME);
-
- set_timeout = 0;
-
- init_timer(&wakeup_timer);
-
- sigfillset(¤t->blocked);
-
printk(KERN_NOTICE "Voyager starting monitor thread\n");
- for(;;) {
- down_interruptible(&kvoyagerd_sem);
+ for (;;) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(set_timeout ? HZ : MAX_SCHEDULE_TIMEOUT);
+
VDEBUG(("Voyager Daemon awoken\n"));
if(voyager_status.request_from_kernel == 0) {
/* probably awoken from timeout */
@@ -143,20 +110,26 @@ thread(void *unused)
check_from_kernel();
voyager_status.request_from_kernel = 0;
}
- if(set_timeout) {
- del_timer(&wakeup_timer);
- wakeup_timer.expires = HZ + jiffies;
- wakeup_timer.function = wakeup;
- add_timer(&wakeup_timer);
- }
}
}
+static int __init
+voyager_thread_start(void)
+{
+ voyager_thread = kthread_run(thread, NULL, "kvoyagerd");
+ if (IS_ERR(voyager_thread)) {
+ printk(KERN_ERR "Voyager: Failed to create system monitor thread.\n");
+ return PTR_ERR(voyager_thread);
+ }
+ return 0;
+}
+
+
static void __exit
voyager_thread_stop(void)
{
- /* FIXME: do nothing at the moment */
+ kthread_stop(voyager_thread);
}
module_init(voyager_thread_start);
-//module_exit(voyager_thread_stop);
+module_exit(voyager_thread_stop);
Index: linux-2.6/include/asm-i386/voyager.h
===================================================================
--- linux-2.6.orig/include/asm-i386/voyager.h 2007-04-22 15:18:39.000000000 +0200
+++ linux-2.6/include/asm-i386/voyager.h 2007-04-22 15:24:13.000000000 +0200
@@ -487,15 +487,11 @@ extern struct voyager_qic_cpi *voyager_q
extern struct voyager_SUS *voyager_SUS;
/* variables exported always */
+extern struct task_struct *voyager_thread;
extern int voyager_level;
-extern int kvoyagerd_running;
-extern struct semaphore kvoyagerd_sem;
extern struct voyager_status voyager_status;
-
-
/* functions exported by the voyager and voyager_smp modules */
-
extern int voyager_cat_readb(__u8 module, __u8 asic, int reg);
extern void voyager_cat_init(void);
extern void voyager_detect(struct voyager_bios_info *);
-
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