linux-kernel - Re: "resource: provide new functions to walk through resources" breaks UML

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Date:	Mon, 11 Aug 2014 08:22:29 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Richard Weinberger <richard@....at>
Cc:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	user-mode-linux-devel <user-mode-linux-devel@...ts.sourceforge.net>,
	sahne@...0.at
Subject: Re: "resource: provide new functions to walk through resources"
 breaks UML

On Sun, Aug 10, 2014 at 06:56:14PM +0200, Richard Weinberger wrote:
> Hi Vivek,
> 
> Daniel Walter reported that UML is currently broken.
> The offending commit is:
> 

Hi Richard,

Thanks for pointing it out. I will look into it.

Would you have link to the report Daniel sent. I am interested in 
looking at backtrace.

Thanks
Vivek

> commit 8c86e70acead629aacb4afcd818add66bf6844d9
> Author: Vivek Goyal <vgoyal@...hat.com>
> Date:   Fri Aug 8 14:25:50 2014 -0700
> 
>     resource: provide new functions to walk through resources
> 
> It dies in next_resource():
>         /* Caller wants to traverse through siblings only */
>         if (sibling_only)
>                 return p->sibling;
> 
> because p is NULL.
> Please note that UML has no iomem, maybe this is the problem...
> 
> Thanks,
> //richard
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