linux-kernel - Re: HPET regression in 2.6.26 versus 2.6.25 -- found another user with the same regression

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Date:	Sat, 23 Aug 2008 17:55:29 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Witbrodt <dawitbro@...global.net>
Cc:	Yinghai Lu <yhlu.kernel@...il.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Bill Fink <billfink@...dspring.com>,
	linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, netdev <netdev@...r.kernel.org>
Subject: Re: HPET regression in 2.6.26 versus 2.6.25 -- found another user
	with the same regression


* David Witbrodt <dawitbro@...global.net> wrote:

>      for (;;) {
>          tmp = *p;
>          if (!tmp || tmp->start > end) {
> +insert:
>              new->sibling = tmp;
>              *p = new;
>              new->parent = root;
> @@ -164,7 +165,10 @@ static struct resource * __request_resource(struct resource *root, struct resour
>          p = &tmp->sibling;
>          if (tmp->end < start)
>              continue;
> -        return tmp;
> +        printk("ignoring resource conflict between %s/{%p..%p} and %s/{%p..%p}\n", new->name, 
> +               (void *)new->start, (void *)new->end, tmp->name, (void *)tmp->start, (void *)tmp->end);
> +        WARN_ON(1);
> +        goto insert;

sorry about that, my first patch was more broken than i thought (it will 
basically hang on _any_ box), please try the second patch.

Note how the above hack code does a stupid goto, and 'p' is updated for 
the next loop iteration already. The second version of the debug patch 
only updates 'p' in the 'continue' case and will hopefully get you much 
further into bootup!

	Ingo
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