linux-kernel - Re: [PATCH] vfio-mdev: Fix mtty sample driver building

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Date:   Thu, 15 Dec 2016 01:12:18 -0700
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Kirti Wankhede <kwankhede@...dia.com>
Cc:     <cjia@...dia.com>, <linux-kernel@...r.kernel.org>,
        <kvm@...r.kernel.org>
Subject: Re: [PATCH] vfio-mdev: Fix mtty sample driver building

On Thu, 15 Dec 2016 13:15:34 +0530
Kirti Wankhede <kwankhede@...dia.com> wrote:

> On 12/15/2016 1:09 AM, Alex Williamson wrote:
> > This sample driver was originally under Documentation/ and was moved
> > to samples, but build support was never adjusted for the new location.
> > 
> > Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
> > ---
> >  samples/Kconfig            |    7 +++++++
> >  samples/Makefile           |    3 ++-
> >  samples/vfio-mdev/Makefile |   14 +-------------
> >  3 files changed, 10 insertions(+), 14 deletions(-)
> >   
> 
> This change would bring this example driver in Kernel build system if
> selected. I do have verified build and tested it on x86_64 platform.
> Have you verified x86 and PPC/ARM build (which I think primarily could
> use VFIO)?

I have not, but I'm fairly confident that CONFIG_SAMPLES is not a
typical user or distro config option, so I think we're at a low risk
of breaking anyone.  In general I test almost exclusively for x86_64 and
rely on external auto builders to identify issues on other archs. 
Thanks,

Alex

> > diff --git a/samples/Kconfig b/samples/Kconfig
> > index a6d2a43..b124f62 100644
> > --- a/samples/Kconfig
> > +++ b/samples/Kconfig
> > @@ -105,4 +105,11 @@ config SAMPLE_BLACKFIN_GPTIMERS
> >  	help
> >  	  Build samples of blackfin gptimers sample module.
> >  
> > +config SAMPLE_VFIO_MDEV_MTTY
> > +	tristate "Build VFIO mtty example mediated device sample code -- loadable modules only"
> > +	depends on VFIO_MDEV_DEVICE && m
> > +	help
> > +	  Build a virtual tty sample driver for use as a VFIO
> > +	  mediated device
> > +
> >  endif # SAMPLES
> > diff --git a/samples/Makefile b/samples/Makefile
> > index e17d66d..86a137e 100644
> > --- a/samples/Makefile
> > +++ b/samples/Makefile
> > @@ -2,4 +2,5 @@
> >  
> >  obj-$(CONFIG_SAMPLES)	+= kobject/ kprobes/ trace_events/ livepatch/ \
> >  			   hw_breakpoint/ kfifo/ kdb/ hidraw/ rpmsg/ seccomp/ \
> > -			   configfs/ connector/ v4l/ trace_printk/ blackfin/
> > +			   configfs/ connector/ v4l/ trace_printk/ blackfin/ \
> > +			   vfio-mdev/
> > diff --git a/samples/vfio-mdev/Makefile b/samples/vfio-mdev/Makefile
> > index a932edb..cbbd868 100644
> > --- a/samples/vfio-mdev/Makefile
> > +++ b/samples/vfio-mdev/Makefile
> > @@ -1,13 +1 @@
> > -#
> > -# Makefile for mtty.c file
> > -#
> > -KERNEL_DIR:=/lib/modules/$(shell uname -r)/build
> > -
> > -obj-m:=mtty.o
> > -
> > -modules clean modules_install:
> > -	$(MAKE) -C $(KERNEL_DIR) SUBDIRS=$(PWD) $@
> > -
> > -default: modules
> > -
> > -module: modules
> > +obj-$(CONFIG_SAMPLE_VFIO_MDEV_MTTY) += mtty.o
> >