linux-kernel - Re: randconfig build error with next-20150316, in samples/kdbus/kdbus-workers

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Date:	Mon, 16 Mar 2015 23:27:54 +0100
From:	David Herrmann <dh.herrmann@...il.com>
To:	Michael Ellerman <mpe@...erman.id.au>
Cc:	Jim Davis <jim.epost@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next <linux-next@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Daniel Mack <daniel@...que.org>,
	David Herrmann <dh.herrmann@...glemail.com>,
	Djalal Harouni <tixxdz@...ndz.org>
Subject: Re: randconfig build error with next-20150316, in samples/kdbus/kdbus-workers

Hi

On Mon, Mar 16, 2015 at 10:12 PM, Michael Ellerman <mpe@...erman.id.au> wrote:
> On Mon, 2015-03-16 at 17:31 +0100, David Herrmann wrote:
>> Hi
>>
>> On Mon, Mar 16, 2015 at 5:22 PM, Jim Davis <jim.epost@...il.com> wrote:
>> > Building with the attached random configuration file,
>> >
>> > In file included from ./include/uapi/linux/kdbus.h:12:0,
>> >                  from samples/kdbus/kdbus-api.h:5,
>> >                  from samples/kdbus/kdbus-workers.c:79:
>> > ./include/uapi/linux/types.h:9:2: warning: #warning "Attempt to use
>> > kernel headers from user space, see
>> > http://kernelnewbies.org/KernelHeaders" [-Wcpp]
>> >  #warning "Attempt to use kernel headers from user space, see
>> > http://kernelnewbies.org/KernelHeaders"
>> >   ^
>> > In file included from ./include/uapi/linux/posix_types.h:4:0,
>> >                  from ./include/uapi/linux/types.h:13,
>> >                  from ./include/uapi/linux/kdbus.h:12,
>> >                  from samples/kdbus/kdbus-api.h:5,
>> >                  from samples/kdbus/kdbus-workers.c:79:
>> > ./include/uapi/linux/stddef.h:1:28: fatal error: linux/compiler.h: No
>> > such file or directory
>> >  #include <linux/compiler.h>
>> >                             ^
>> > compilation terminated.
>> > scripts/Makefile.host:91: recipe for target 'samples/kdbus/kdbus-workers' failed
>> > make[2]: *** [samples/kdbus/kdbus-workers] Error 1
>>
>> If you build the samples in ./samples/, you need up-to-date kernel
>> headers. The kdbus samples rely on linux/kdbus.h to be available.
>>
>> A simple "make headers_install" will copy the headers to the local
>> directory ./usr/ in your kernel tree. This is the preferred location
>> over /usr/include by all tools in the kernel tree. That is, run "make
>> headers_install" once and your local tree will build fine. Once your
>> kernel-headers in /usr/include are up-to-date, it will work just
>> out-of-the-box again.
>>
>> In other words, if CONFIG_SAMPLES is enabled, you need the sanitized
>> kernel headers in your include path.
>
> But the samples are also including the unsanitised headers, which I think is
> what's causing the problem here.

The uapi-include only causes the warning, not the build failure.
There's already a fix for that queued:

http://git.kernel.org/cgit/linux/kernel/git/gregkh/char-misc.git/commit/?h=kdbus&id=526edb23cd096375683455c73b56baba34ae3f06

Thanks
David
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