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

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Date:	Sun, 18 Nov 2007 23:27:02 +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>,
	r.marek@...embler.cz, lm-sensors@...sensors.org
Subject: Re: broken suspend [Was: 2.6.24-rc2-mm1]

Aah, we probably should let coretemp people known.

Whole thread:
http://marc.info/?t=119507205800001&r=1&w=2

On 11/18/2007 08:09 PM, Jiri Slaby wrote:
> 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.

Just in case you are curious:
http://www.fi.muni.cz/~xslaby/sklad/susp_hang3.diff
produces:
http://www.fi.muni.cz/~xslaby/sklad/susp_hang3.png


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