linux-kernel - Re: [PATCH] USB: core: fix missing include <linux/usb/of.h>

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Message-ID: <16060867.1nFmu0b2lQ@wuerfel>
Date:	Tue, 14 Jun 2016 13:08:08 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	kbuild test robot <lkp@...el.com>
Cc:	Ben Dooks <ben.dooks@...ethink.co.uk>, kbuild-all@...org,
	linux-kernel@...ts.codethink.co.uk,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Alan Stern <stern@...land.harvard.edu>,
	Peter Chen <peter.chen@...escale.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: core: fix missing include <linux/usb/of.h>

On Wednesday, June 8, 2016 3:04:27 AM CEST kbuild test robot wrote:
> >> drivers/usb/core/of.c:32:21: error: redefinition of 'usb_of_get_child_node'
>     struct device_node *usb_of_get_child_node(struct device_node *parent,
>                         ^~~~~~~~~~~~~~~~~~~~~
>    In file included from drivers/usb/core/of.c:21:0:
>    include/linux/usb/of.h:36:35: note: previous definition of 'usb_of_get_child_node' was here
>     static inline struct device_node *usb_of_get_child_node
>                                       ^~~~~~~~~~~~~~~~~~~~~
> 
> vim +/usb_of_get_child_node +32 drivers/usb/core/of.c
> 
> 69bec725 Peter Chen 2016-02-19  26   * @portnum: the port number which device is connecting
> 69bec725 Peter Chen 2016-02-19  27   *
> 69bec725 Peter Chen 2016-02-19  28   * Find the node from device tree according to its port number.
> 69bec725 Peter Chen 2016-02-19  29   *
> 69bec725 Peter Chen 2016-02-19  30   * Return: On success, a pointer to the device node, %NULL on failure.
> 69bec725 Peter Chen 2016-02-19  31   */
> 69bec725 Peter Chen 2016-02-19 @32  struct device_node *usb_of_get_child_node(struct device_node *parent,
> 69bec725 Peter Chen 2016-02-19  33                                      int portnum)
> 69bec725 Peter Chen 2016-02-19  34  {
> 69bec725 Peter Chen 2016-02-19  35      struct device_node *node;
> 
> 

I think what we want here is to make the compilation of of.o conditional on
CONFIG_OF, so we get only one of the two definitions.

	Arnd