linux-kernel - Re: broken suspend (sched related) [Was: 2.6.24-rc4-mm1]

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Message-ID: <475B24F4.3090904@gmail.com>
Date:	Sun, 09 Dec 2007 00:12:52 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>
Subject: Re: broken suspend (sched related) [Was: 2.6.24-rc4-mm1]

On 12/08/2007 04:24 PM, Ingo Molnar wrote:
> i'm wondering why it had no effect now

diff --git a/kernel/cpu.c b/kernel/cpu.c
index e0d3a4f..a46c252 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -47,15 +47,21 @@ void __init cpu_hotplug_init(void)
 }

 #ifdef CONFIG_HOTPLUG_CPU
-
+#include <asm/io.h>
 void get_online_cpus(void)
 {
+       outb(0x20, 0x80);
        might_sleep();
+       outb(0x21, 0x80);
        if (cpu_hotplug.active_writer == current)
                return;
+       outb(0x22, 0x80);
        mutex_lock(&cpu_hotplug.lock);
+       outb(0x23, 0x80);
        cpu_hotplug.refcount++;
+       outb(0x24, 0x80);
        mutex_unlock(&cpu_hotplug.lock);
+       outb(0x25, 0x80);

 }
 EXPORT_SYMBOL_GPL(get_online_cpus);

produces 0x22 on the LCD (called from watchdog kthread).

Going to catch some sleep,
--js
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