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Message-ID: <20080906175521.GX4856@elte.hu>
Date: Sat, 6 Sep 2008 19:55:21 +0200
From: Ingo Molnar <mingo@...e.hu>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Yinghai Lu <yhlu.kernel@...il.com>,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Jesse Barnes <jbarnes@...tuousgeek.org>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: split e820 reserved entries record to late v4
* Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> On Fri, 29 Aug 2008, Ingo Molnar wrote:
> >
> > BIOS-e820: 0000000077ff0000 - 0000000078000000 (reserved)
> > BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
> > BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved)
> >
> > which overlaps with the chipset PCI BAR (hpet) resource:
> >
> > pci 0000:00:14.0: BAR has HPET at fed00000-fed003ff
> >
> > so due to this 1K conflict we take the full e820-reserved entry out and
> > give the range 0xfec00000-0x100000000 as 'free'.
>
> That's wrong. It's a full overlap, so "insert_resource()" should
> happily insert the 00000000fec00000 - 0000000100000000 _around_ the
> HPET bar.
>
> Do you actually see this behavior, or do you just misunderstand how
> "insert_resource()" works?
the latter, i misunderstood how it works.
Ingo
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