linux-kernel - Re: WARNING: at arch/x86/mm/ioremap.c:226

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Message-ID: <20081020185353.GF7829@linux-os.sc.intel.com>
Date:	Mon, 20 Oct 2008 11:53:54 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Thomas Meyer <thomas@...3r.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dwmw2@...radead.org, c-d.hailfinger.devel.2006@....net,
	dolsen@...i.com, rjackson@...i.com
Subject: Re: WARNING: at arch/x86/mm/ioremap.c:226

On Mon, Oct 20, 2008 at 11:28:51AM -0700, Arjan van de Ven wrote:
> [   16.914566] ck804xrom ck804xrom_init_one(): Unable to register resource 0x00000000ff000000-0x00000000ffffffff - kernel bug?
> [   16.914575] resource map sanity check conflict: 0xff000000
> 0xffffffff 0xff780000 0xffffffff reserved
> 
> [   16.914636]  [<c042c02c>] ioremap_nocache+0xd/0xf
> [   16.914640]  [<f87e4246>] ? init_ck804xrom+0x246/0x4c7 [ck804xrom]
> [   16.914643]  [<f87e4246>] init_ck804xrom+0x246/0x4c7 [ck804xrom]
> 
> the init_ck804xrom driver seems to be requesting a bunch of memory with
> ioremap that crosses several resources...
> which is very bad.
> 
> Can you sent the /proc/iomem file ?

drivers/mtd/maps/ck804xrom.c is hardcoding the address as:

	window->phys = 0xff000000; /* 16MiB, hardcoded for now */

followed by:

	ioremap_nocache(window->phys, window->size);

And later I see something like:

#if 1
	/* The probe sequence run over the firmware hub lock
	 * registers sets them to 0x7 (no access).
	 * Probe at most the last 4MiB of the address space.
	 */
	if (map_top < 0xffc00000)
		map_top = 0xffc00000;
#endif

If they are only probing the last 4MB, the above window mapping can also be
reduced accordingly.

Copying some folks.

thanks,
suresh
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