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

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Date:   Thu, 15 Dec 2016 10:09:03 -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 15:17:46 +0530
Kirti Wankhede <kwankhede@...dia.com> wrote:

> On 12/15/2016 1:42 PM, Alex Williamson wrote:
> > 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.   
> 
> Ok. I'm fine with this change. Also saw Eric's confirmation on ARM
> aarch64 compilations. Thanks.
> 
> Reviewed-by: Kirti Wankhede <kwankhede@...dia.com>

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
> >>>     
> >