linux-kernel - Re: [PATCH] x86, pci-hotplug, calgary / rio: fix EBDA ioremap()

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Date:	Fri, 26 Sep 2008 04:14:11 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Linas Vepstas <linas@...tin.ibm.com>,
	"rajesh.shah@...el.com" <rajesh.shah@...el.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Kristen Accardi <kristen.c.accardi@...el.com>,
	Muli Ben-Yehuda <muli@...ibm.com>, jbarnes@...tuousgeek.org,
	tglx@...utronix.de, hpa@...or.com, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yhlu.kernel@...il.com>
Subject: Re: [PATCH] x86, pci-hotplug, calgary / rio: fix EBDA ioremap()

>>
>> mapping the EBDA is rather ... un-nice from that driver, so i guess 
>> you check does the right thing in flagging possible crap.
> 
> it does:
> 
>     addr:  0x9f800
>      end:  0xaf5e7
> p->start:  0x9f800
>   p->end:  0x9ffff
> 
> resources are laid out like this:
> 
>   0009f800-0009ffff : reserved
>   000a0000-000bffff : Video RAM area
> 
> so the driver over-maps into the Video RAM...

... and makes that uncachable (while it probably was WC before)

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