linux-kernel - Re: [PATCH] of/pci: add pci_pio_to_address dummy for !CONFIG

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Message-ID: <20140930212855.GA15713@borg.dudau.co.uk>
Date:	Tue, 30 Sep 2014 22:28:55 +0100
From:	Liviu Dudau <liviu@...au.co.uk>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Arnd Bergmann <arnd@...db.de>, Liviu Dudau <Liviu.Dudau@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Rob Herring <robh@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	linux-arm <linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] of/pci: add pci_pio_to_address dummy for !CONFIG_OF

On Tue, Sep 30, 2014 at 01:53:06PM -0600, Bjorn Helgaas wrote:
> On Tue, Sep 30, 2014 at 11:10 AM, Liviu Dudau <liviu@...au.co.uk> wrote:
> > On Tue, Sep 30, 2014 at 10:01:39AM -0600, Bjorn Helgaas wrote:
> >> On Tue, Sep 30, 2014 at 03:19:05PM +0200, Arnd Bergmann wrote:
> >> > The pci_register_io_range() and pci_pio_to_address() were recently
> >> > introduced to generalize the handling of memory mapped PCI I/O space,
> >> > but they are only valid when CONFIG_OF is set, leading to a possible
> >> > build error:
> >> >
> >> > drivers/pci/host/pcie-rcar.c: In function 'rcar_pcie_setup_window':
> >> > drivers/pci/host/pcie-rcar.c:340:3: error: implicit declaration of function 'pci_pio_to_address' [-Werror=implicit-function-declaration]
> >> >    res_start = pci_pio_to_address(res->start);
> >> >    ^
> >> > drivers/pci/host/pcie-rcar.c: In function 'rcar_pcie_probe':
> >> > drivers/pci/host/pcie-rcar.c:945:3: error: implicit declaration of function 'of_pci_range_to_resource' [-Werror=implicit-function-declaration]
> >> >    err = of_pci_range_to_resource(&range, pdev->dev.of_node,
> >> >    ^
> >> > cc1: some warnings being treated as errors
> >> >
> >> > This provides inline dummy implementations for the case that
> >> > CONFIG_OF is disabled, to allow better build testing.
> >> >
> >> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> >> > Fixes: 279c5dd046 ("of/pci: Add pci_register_io_range() and pci_pio_to_address()")
> >>
> >> I'm rebuilding the pci/host-generic branch to pick up the other v13 fixes,
> >> so I folded this fix directly into the "of/pci: Add pci_register_io_range()
> >> and pci_pio_to_address()" patch.  Thanks for finding this; the config
> >> dependencies are a bit of a mess.
> >
> > Bjorn,
> >
> > I suggest splitting this patch into 2 parts, move the one that adds pci_pio_to_address() in patch 2
> > and the other in patch 5.
> 
> Yeah, I screwed that up.  I had just applied Arnd's patch completely
> to 279c5dd046, which doesn't quite make sense.
> 
> I tried again like this:
> 
>   - In "of/pci: Add pci_register_io_range() and pci_pio_to_address()",
> I added the dummy pci_pio_to_address(), so there's an extern and a
> definition in address.c when CONFIG_OF_ADDRESS=y, and an inline dummy
> otherwise.
> 
>   - I dropped "of/pci: Define of_pci_range_to_resource() only when
> CONFIG_PCI=y".
> 
>   - In "of/pci: Move of_pci_range_to_resource() to of/address.c", I
> added the dummy of_pci_range_to_resource(), so there's an extern an a
> definition in address.c when CONFIG_OF_ADDRESS=y and CONFIG_PCI=y, and
> an inline dummy otherwise.
> 
> I'm not really set up to build test this, and my head is swimming a
> bit, so I hope this is it.  I pushed the pci/host-generic branch
> again, so you can look at it yourself.

Hi Bjorn,

It looks good to me. Functionality-wise I can only test it tomorrow UK time,
but from the diffs I've done I thinks we're good.

Will wait for more reports from the build bot.

Take care,
Liviu

> 
> Bjorn
> 

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