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

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Message-ID: <CANq1E4RXYQJLcjf3pCu7zovw01uMnHTtMkiugjsJVQ8D=fLnVg@mail.gmail.com>
Date:	Tue, 17 Mar 2015 00:00:48 +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 11:51 PM, Michael Ellerman <mpe@...erman.id.au> wrote:
> On Mon, 2015-03-16 at 23:27 +0100, David Herrmann wrote:
>> The uapi-include only causes the warning, not the build failure.
>
> I don't know how you came to that conclusion?
>
> It fails looking for linux/compiler.h, which is only included from the kernel
> headers, never from the exported headers.

We only include linux/kdbus.h. On sanitized headers, this will include
linux/types.h -> linux/posix_types.h -> linux/stddef.h.
If you use the uapi headers, then stddef.h is not sanitized and will
still include linux/compiler.h (which is removed on sanitized
headers). Hence, this error only occurs if you include
uapi/linux/kdbus.h. With sanitized headers in ./usr/, the compiler
will prefer ./usr/linux/kdbus.h and ./usr/linux/stddef.h, thus never
including any linux/compiler.h.

If you drop -I./include/uapi/, you will get "linux/kdbus.h not found".
The error will be different, but it will not fix anything. However, if
you run "make headers_install", everything will compile just fine even
with -I./include/uapi/.

Thanks
David
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