linux-kernel - Re: Linux 2.6.27-rc5: System boot regression caused by commit a2bd7274b47124d2fc4dfdb8c0591f545ba749dd

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Date:	Fri, 29 Aug 2008 19:16:47 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Yinghai Lu <yhlu.kernel@...il.com>
cc:	Jordan Crouse <jordan.crouse@....com>,
	David Witbrodt <dawitbro@...global.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeff Garzik <jeff@...zik.org>, Tejun Heo <htejun@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kernel Testers <kernel-testers@...r.kernel.org>
Subject: Re: Linux 2.6.27-rc5: System boot regression caused by commit
 a2bd7274b47124d2fc4dfdb8c0591f545ba749dd



On Fri, 29 Aug 2008, Yinghai Lu wrote:
> > Ok, can we please
> >
> >  - *do* get a quirk for known-broken chipsets (at a *PCI* level, this is
> >   not an x86 issue)
> 
> the quirk work at the first point for David' system.

That was not what I meant - meant the known-broken MMIO bar.

> [PATCH] x86: protect hpet in BAR for one ATI chipset v3

Now, this is probably fine too in theory, but

 - you didn't check if the BAR is even enabled, afaik

 - the other patch - to move the reserved e820 range later - should make 
   this pointless, no?

> >  - *not* get any more random PCI work-arounds that go through the x86 tree
> >   and aren't even looked at by the (very few) people who actually
> >   understand the PCI resource handling?
> 
> stop working on following path?
> [PATCH] x86: split e820 reserved entries record to late v4
> [PATCH] x86: split e820 reserved entries record to late v4 - fix v2

No, I think this is worth doing, BUT IT MUST NOT BE MERGED BY JUST SENDING 
IT TO INGO.

It's not an "x86 patch". It's about the PCI resources.

And those kinds of patches need to be acked by people who know and 
understand the PCI resource issues and have some memory of just how 
broken machines can exist.

			Linus
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