linux-kernel - Re: [RFC 3/4] arm64: Do not call enable PCI resources when specify PCI_PROBE

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Message-ID: <1435098868.3996.11.camel@kernel.crashing.org>
Date:	Wed, 24 Jun 2015 08:34:28 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	Will Deacon <will.deacon@....com>,
	Liviu Dudau <liviu.dudau@....com>,
	Marc Zyngier <marc.zyngier@....com>,
	Mark Rutland <mark.rutland@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Jason Cooper <jason@...edaemon.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rob Herring <robh+dt@...nel.org>,
	linux-arm <linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [RFC 3/4] arm64: Do not call enable PCI resources when specify
 PCI_PROBE_ONLY

On Mon, 2014-09-29 at 12:17 -0600, Bjorn Helgaas wrote:
> This seems like more than necessary, but I don't know all the history.
> In particular, I don't know why PCI_PROBE_ONLY should make a
> difference to things like claiming resources.

It shouldn't ... we created that option on ppc originally to avoid
allocation/reallocation of resources. If they are bad, leave them bad,
but it was never a question of disabling all these other things.

(Ok, the MRSS/MPS is debatable, but why not plumb the parent pointers
and why not claim ? That doesn't make sense to me).

Cheers,
Ben.

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