linux-kernel - Re: [PATCH] x86/pci: make pci_mem

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Date:	Thu, 16 Apr 2009 19:38:05 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Yinghai Lu <yinghai@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-pci@...r.kernel.org, yannick.roehlly@...e.fr
Subject: Re: [PATCH] x86/pci: make pci_mem_start to be aligned only -v3


* H. Peter Anvin <hpa@...or.com> wrote:

> Yinghai Lu wrote:
> > 
> > that need to do done much earlier, and much simple, just need to make that range to be reserved in e820.
> > and later e820_setup_gap even don't need to be aligned again.
> > 
> 
> As long as that doesn't cause the PCI layer to move devices 
> already assigned in this range out of it.  What we want is really 
> a "weak reserve".  On the other hand, that may very well be the 
> semantics of the existing reserved space, too (I honestly haven't 
> looked lately.)

We have reserve_region_with_split(), which 'wraps around' existing 
resources non-intrusively by creating split-up resources - 
preventing their forced reallocation (and preventing their possible 
breakage - a number of BARs dont like dynamic reallocations at all).

	Ingo
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