linux-kernel - Re: [PATCH 13/14] kdbus: add walk-through user space example

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Date:	Tue, 24 Mar 2015 19:51:43 +0100
From:	Daniel Mack <daniel@...que.org>
To:	Michal Marek <mmarek@...e.cz>, Jiri Slaby <jslaby@...e.cz>,
	David Herrmann <dh.herrmann@...il.com>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Tom Gundersen <teg@...m.no>, Jiri Kosina <jkosina@...e.cz>,
	Andy Lutomirski <luto@...capital.net>,
	Linux API <linux-api@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Djalal Harouni <tixxdz@...ndz.org>,
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH 13/14] kdbus: add walk-through user space example

On 03/24/2015 07:22 PM, Michal Marek wrote:
> Dne 24.3.2015 v 18:37 Jiri Slaby napsal(a):

>> Oh, it's cut&paste, I see. This does not look correct though. The hack
>> inclusive. Host progs are intended to be run on the host where the
>> kernel is built. During the compilation or such (like x/menuconfig).
>> Quite misleading naming if you are used to the autotools one.
> 
> when cross compiling, we are a bit between a rock and a hard place with
> the sample userspace programs:
> - The target toolchain might not have libc support
> - The host toolchain might be lacking recent kernel headers (therefore
>   the need to do make headers_install)
> - It's not clean whether the samples are meant to be ran on the build
>   host or target.

Exactly. I just checked in a cross-compiled source tree, and none of the
compiled standalone executables from samples/ or Documentation/ are
actually built for the target platform. Only the samples which come as
kernel modules are.

> There has been some work by Sam Ravnborg to introduce uapiprogs-y to for
> sample userspace programs, but for now, please use hostprogs-y,
> -Iusr/include and make each sample opt-in.

Alright then. Does the attached patch fix your problem, Jiri?


Thanks,
Daniel


View attachment "0001-kdbus-sample-build-kdbus-workers-conditionally.patch" of type "text/x-diff" (1420 bytes)