linux-kernel - Re: [PATCH 1/1] x86: don't exclude low BIOS area when allocating address space for non-PCI cards

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Message-ID: <20140716213513.18895776q3wl3oj5@berry.schulz.ip-v6.eu>
Date:	Wed, 16 Jul 2014 21:35:13 +0200
From:	Christoph Schulz <develop@...stov.de>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>,
	Robert Resch <fli4l@...ert.reschpara.de>
Subject: Re: [PATCH 1/1] x86: don't exclude low BIOS area when allocating
 address space for non-PCI cards

Hello!

Bjorn Helgaas schrieb am Wed, 16 Jul 2014 13:00:21 -0600:

> I applied this to pci/misc for v3.17, thanks.

Thank you very much. What do you think about queuing it up to -stable?  
Commit 30919b0bf356 is in the tree since 2.6.37-rc7. We have used the  
proposed patch for over a year (since 3.2.42 / 3.7.10 / 3.8.5, to be  
exact) without any regressions. I *think* it meets the criteria for  
-stable, but I don't have much experience of Linux kernel development  
processes, so it's your decision, of course.

> This effectively reverts 30919b0bf356 ("x86: avoid low BIOS area when
> allocating address space").  I don't see a reference there to a bug
> fixed by 30919b0bf356, so hopefully reverting it won't reintroduce a
> bug.

Well, for PCI, the current behaviour does not change effectively, and  
for ISA, the proposed patch fixes a bug. What memory allocations  
beyond ISA and PCI could be adversely affected?


Best regards,

Christoph Schulz

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