linux-kernel - Re: broken suspend [Was: 2.6.24-rc2-mm1]

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Message-ID: <47408DFF.9070701@gmail.com>
Date:	Sun, 18 Nov 2007 20:09:51 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <greg@...ah.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>
Subject: Re: broken suspend [Was: 2.6.24-rc2-mm1]

On 11/18/2007 06:07 PM, Alan Stern wrote:
> You'll get more useful results if you redo your changes to 
> notifier_call_chain().  Have it print out the address of the routine 
> _before_ making the call, and don't limit it to 20.  That way you'll 
> know exactly which notifier routine ends up hanging.

The problem is, that notifier_call_chain is called again and again zillion times
by somebody else...

Anyway you led me to another idea:
* _cpu_down
        printk("%s: u\n", __func__);
        BUBAK=1;
        /* CPU is completely dead: tell everyone.  Too late to complain. */
        if (raw_notifier_call_chain(&cpu_chain, CPU_DEAD | 0x88000 | mod,
                                    hcpu) == NOTIFY_BAD)
                BUG();
        BUBAK=0;
-----
* notifier_call_chain
        unsigned int a = val & 0x88000;
        unsigned int yes = a == 0x88000;

        nb = rcu_dereference(*nl);

        if (a && a != 0x88000)
                printk("Somebody calls with val: %lx\n", val);
        else
                val &= ~0x88000;

        while (nb && nr_to_call) {
                next_nb = rcu_dereference(nb->next);
                if (unlikely(BUBAK && yes))
                        printk("%s: %p\n", __func__, nb->notifier_call);
                ret = nb->notifier_call(nb, val, v);
-----
gives coretemp_cpu_callback -> coretemp_device_remove ->
platform_device_unregister, so coretemp seems to be what I have and you don't.


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