linux-kernel - Re: linux-next: build failure after merge of the v4l-dvb tree

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Date:   Fri, 13 Mar 2020 08:07:35 +0100
From:   Mauro Carvalho Chehab <mchehab@...nel.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Marco Felsch <m.felsch@...gutronix.de>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Subject: Re: linux-next: build failure after merge of the v4l-dvb tree

Em Fri, 13 Mar 2020 13:19:03 +1100
Stephen Rothwell <sfr@...b.auug.org.au> escreveu:

> Hi all,
> 
> After merging the v4l-dvb tree, today's linux-next build (arm
> multi_v7_defconfig) failed like this:
> 
> ERROR: modpost: "fwnode_get_name" [drivers/media/v4l2-core/v4l2-fwnode.ko] undefined!
> 
> Caused by commit
> 
>   dfc22c073b78 ("media: v4l2-fwnode: add initial connector parsing support")
> 
> I have used the v4l-dvb tree from next-20200312 for today.

Hmm... I double-checked at next-20200312. This function is defined
at linux/property.h header:

	include/linux/property.h:const char *fwnode_get_name(const struct fwnode_handle *fwnode);

Its implementation is at drivers/base/property.c, and this is always
built, according with drivers/base/Makefile:

	obj-y			:= component.o core.o bus.o dd.o syscore.o \
				   driver.o class.o platform.o \
				   cpu.o firmware.o init.o map.o devres.o \
				   attribute_container.o transport_class.o \
				   topology.o container.o property.o cacheinfo.o \
				   devcon.o swnode.o

The v4l2-fwnode.c properly includes include/linux/property.h.

So, at least up to next-20200312, everything looks fine on my eyes.

The header is probably there, as the error happened at link stage.

Maybe there is some merge conflict caused by merging a patch from
some other tree that might have renamed or removed its implementation
after next-20200312, or changed from obj-y target?

Or maybe this changeset got reverted?

	a7914d1072fb ("device property: Export fwnode_get_name()")

Thanks,
Mauro