linux-kernel - Re: [PATCH v3 3/5] PCI: st: Provide support for the sti PCIe controller

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Message-ID: <1428747477.17822.90.camel@x220>
Date:	Sat, 11 Apr 2015 12:17:57 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Gabriel FERNANDEZ <gabriel.fernandez@...com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Srinivas Kandagatla <srinivas.kandagatla@...il.com>,
	Maxime Coquelin <maxime.coquelin@...com>,
	Patrice Chotard <patrice.chotard@...com>,
	Russell King <linux@....linux.org.uk>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jingoo Han <jg1.han@...sung.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Fabrice Gasnier <fabrice.gasnier@...com>,
	Kishon Vijay Abraham I <kishon@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Greg KH <gregkh@...uxfoundation.org>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Joe Perches <joe@...ches.com>, Tejun Heo <tj@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Thierry Reding <treding@...dia.com>,
	Phil Edworthy <phil.edworthy@...esas.com>,
	Minghuan Lian <Minghuan.Lian@...escale.com>,
	Tanmay Inamdar <tinamdar@....com>, m-karicheri2@...com,
	Sachin Kamat <sachin.kamat@...sung.com>,
	Andrew Lunn <andrew@...n.ch>,
	Liviu Dudau <liviu.dudau@....com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	kernel@...inux.com, linux-pci@...r.kernel.org,
	Lee Jones <lee.jones@...aro.org>,
	Gabriel Fernandez <gabriel.fernandez@...aro.org>
Subject: Re: [PATCH v3 3/5] PCI: st: Provide support for the sti PCIe
 controller

Something I didn't spot in my first look at this patch.

On Fri, 2015-04-10 at 11:12 +0200, Gabriel FERNANDEZ wrote:
> --- a/drivers/pci/host/Kconfig
> +++ b/drivers/pci/host/Kconfig
>  
> +config PCI_ST
> +	bool "ST PCIe controller"
> +	depends on ARCH_STI || (ARM && COMPILE_TEST)
> +	select PCIE_DW
> +	help
> +	  Enable PCIe controller support on ST Socs. This controller is based
> +	  on Designware hardware and therefore the driver re-uses the
> +	  Designware core functions to implement the driver.

You can't have ARCH_STI without ARM, so ARM will always be set if this
driver is enabled. Correct?

> --- /dev/null
> +++ b/drivers/pci/host/pci-st.c

> +	if (IS_ENABLED(CONFIG_ARM)) {
> +		/*
> +		 * We have to hook the abort handler so that we can intercept
> +		 * bus errors when doing config read/write that return UR,
> +		 * which is flagged up as a bus error
> +		 */
> +		hook_fault_code(16+6, st_pcie_abort_handler, SIGBUS, 0,
> +				"imprecise external abort");
> +	}

So, unless I'm missing something obvious here, IS_ENABLED(CONFIG_ARM)
will always evaluate to 1. Can't that test be dropped?


Paul Bolle

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