linux-kernel - Re: linux-next: build failure after merge of the tty tree

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Message-ID: <20180911084346.GB4185@dell>
Date:   Tue, 11 Sep 2018 09:43:46 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Nicolas Ferre <nicolas.ferre@...rochip.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>, Greg KH <greg@...ah.com>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Radu Pirea <radu.pirea@...rochip.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Rob Herring <robh@...nel.org>
Subject: Re: linux-next: build failure after merge of the tty tree

On Tue, 11 Sep 2018, Nicolas Ferre wrote:

> On 11/09/2018 at 10:25, Lee Jones wrote:
> > On Tue, 11 Sep 2018, Stephen Rothwell wrote:
> > 
> > > Hi Greg,
> > > 
> > > After merging the tty tree, today's linux-next build (arm
> > > multi_v7_defconfig) failed like this:
> > > 
> > > drivers/mfd/at91-usart.c:51:34: error: array type has incomplete element type 'struct of_device_id'
> > >   static const struct of_device_id at91_usart_mode_of_match[] = {
> > >                                    ^~~~~~~~~~~~~~~~~~~~~~~~
> > > drivers/mfd/at91-usart.c:52:4: error: field name not in record or union initializer
> > >    { .compatible = "atmel,at91rm9200-usart" },
> > >      ^
> > > drivers/mfd/at91-usart.c:52:4: note: (near initialization for 'at91_usart_mode_of_match')
> > > drivers/mfd/at91-usart.c:53:4: error: field name not in record or union initializer
> > >    { .compatible = "atmel,at91sam9260-usart" },
> > >      ^
> > > drivers/mfd/at91-usart.c:53:4: note: (near initialization for 'at91_usart_mode_of_match')
> > > drivers/mfd/at91-usart.c:51:34: warning: 'at91_usart_mode_of_match' defined but not used [-Wunused-variable]
> > >   static const struct of_device_id at91_usart_mode_of_match[] = {
> > >                                    ^~~~~~~~~~~~~~~~~~~~~~~~
> > > 
> > > Caused by commit
> > > 
> > >    7d3aa342cef7 ("mfd: at91-usart: Add MFD driver for USART")
> > > 
> > > Forgot to include <linux/mod_devicetable.h>?
> > 
> > Looks like a missing Device Tree header <linux/of.h>.
> > 
> > Will chase this today and follow up with another PR.
> 
> Hi all,
> 
> Actually it is due to the missing of  <linux/mod_devicetable.h> as Stephen
> suggested. It is due to the patch ac3167257b9f ("headers: separate
> linux/mod_devicetable.h from linux/platform_device.h") merged in v4.19-rc1.

Since this set uses Device Tree, it really should include the of.h.

This solves the issue reported above.

I will fix-up and re-send the pull-request.

> because linux/platform_device.h was included by linux/mfd/core.h that is
> present in this driver. This is why the issue was not identified beforehand.
> 
> I'm building a tiny patch to address this right now.
> 
> Thanks for your help. Best regards,

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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