linux-kernel - Re: ohci1394 problem (MMIO broken) (was 2.6.25-rc6-git6: Reported regressions from 2.6.24)

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Date:	Sat, 22 Mar 2008 16:28:01 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"H. Peter Anvin" <hpa@...nel.org>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Stefan Richter" <stefanr@...6.in-berlin.de>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Ivan Kokshaysky" <ink@...assic.park.msu.ru>,
	"Thomas Meyer" <thomas@...3r.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	"Adrian Bunk" <bunk@...nel.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Natalie Protasevich" <protasnb@...il.com>
Subject: Re: ohci1394 problem (MMIO broken) (was 2.6.25-rc6-git6: Reported regressions from 2.6.24)

On Sat, Mar 22, 2008 at 2:59 PM, H. Peter Anvin <hpa@...nel.org> wrote:
> Linus Torvalds wrote:
>  >
>  > Ingo/Thomas - should ioremap*() perhaps take "resource_size_t" or a "u64"
>  > for the address (and then "__ioremap()" should probably take a PFN, not a
>  > physical address, and that one can remain just a "unsigned long"?)
>  >
>
>  resource_size_t seems to make sense here.  In the case when we have
>  64-bit resources but no PAE support we should error our when the
>  resource is out of range rather than silently fail.
>
>
>  > Has anybody ever had a working 64-bit BAR on x86? Ivan? Maybe I'm missing
>  > something..
>
>  64-bit BAR, certainly.  64-bit BAR with a value beyond 4 GB I would find
>  questionable at best... I suspect the answer is "no".
>
Opteron system with coprocessor on socket or HTX slot. will use 64bit
BAR above 4g and size is more than 4g too.

YH
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