linux-kernel - Re: [PATCH] pci: mvebu: add MVEBU

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Message-ID: <20180530152024.GC39853@bhelgaas-glaptop.roam.corp.google.com>
Date:   Wed, 30 May 2018 10:20:24 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Cyrille Pitchen <cyrille.pitchen@...e-electrons.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Rob Herring <robh@...nel.org>,
        Marc Gonzalez <marc_gonzalez@...madesigns.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pci: mvebu: add MVEBU_MBUS dependency

On Tue, May 29, 2018 at 11:41:51AM +0200, Arnd Bergmann wrote:
> Enabling the PCI_MVEBU driver for compile testing caused a build failure
> on ARM randconfig builds:
> 
> drivers/pci/host/pci-mvebu.c: In function 'mvebu_pcie_del_windows':
> drivers/pci/host/pci-mvebu.c:341:3: error: implicit declaration of function 'mvebu_mbus_del_window'; did you mean 'mvebu_pcie_del_windows'? [-Werror=implicit-function-declaration]
>    mvebu_mbus_del_window(base, sz);
>    ^~~~~~~~~~~~~~~~~~~~~
>    mvebu_pcie_del_windows
> drivers/pci/host/pci-mvebu.c: In function 'mvebu_pcie_add_windows':
> drivers/pci/host/pci-mvebu.c:364:9: error: implicit declaration of function 'mvebu_mbus_add_window_remap_by_id'; did you mean 'mvebu_pcie_add_windows'? [-Werror=implicit-function-declaration]
>    ret = mvebu_mbus_add_window_remap_by_id(target, attribute, base,
>          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>          mvebu_pcie_add_windows
> drivers/pci/host/pci-mvebu.c: In function 'mvebu_pcie_probe':
> drivers/pci/host/pci-mvebu.c:1209:2: error: implicit declaration of function 'mvebu_mbus_get_pcie_mem_aperture'; did you mean 'mvebu_mbus_get_io_win_info'? [-Werror=implicit-function-declaration]
> drivers/pci/host/pci-mvebu.c:1215:2: error: implicit declaration of function 'mvebu_mbus_get_pcie_io_aperture'; did you mean 'mvebu_mbus_get_io_win_info'? [-Werror=implicit-function-declaration]
> 
> The problem is that the mbus helper functions are not declared in the
> header. There are two ways of solving this: we can change the header
> to provide empty stub functions for CONFIG_MVEBU_MBUS=n, or we can
> add back the dependency here.
> 
> I picked the second option since that is simpler, but it somewhat
> defeats the purpose of the original patch because we still cannot
> compile test on other platforms this way.
> 
> Fixes: 51bc085d6454 ("PCI: Improve host drivers compile test coverage")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks, I added this when doing the merge.

> ---
>  drivers/pci/host/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
> index fa51d0893384..5340950f4b98 100644
> --- a/drivers/pci/host/Kconfig
> +++ b/drivers/pci/host/Kconfig
> @@ -6,6 +6,7 @@ menu "PCI host controller drivers"
>  config PCI_MVEBU
>  	bool "Marvell EBU PCIe controller"
>  	depends on ARCH_MVEBU || ARCH_DOVE || COMPILE_TEST
> +	depends on MVEBU_MBUS
>  	depends on ARM
>  	depends on OF
>  
> -- 
> 2.9.0
>