linux-kernel - Re: [PATCH v1 0/2] Kconfig changes to enable Graphics Support for S390

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Date:   Fri, 26 Jan 2018 16:06:36 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Farhan Ali <alifm@...ux.vnet.ibm.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Tomi Valkeinen <tomi.valkeinen@...com>
Subject: Re: [PATCH v1 0/2] Kconfig changes to enable Graphics Support for S390

Hi Farhan,

On Fri, Jan 26, 2018 at 3:35 PM, Farhan Ali <alifm@...ux.vnet.ibm.com> wrote:
> On 01/26/2018 08:41 AM, Geert Uytterhoeven wrote:
>> On Thu, Jan 25, 2018 at 4:47 PM, Farhan Ali <alifm@...ux.vnet.ibm.com>
>> wrote:
>>> This series of patches are in preparation for enabling an additional
>>> tty and console for a S390 KVM guest using a virtio-gpu device[1].
>>> One of the steps to do this would be to enable CONFIG_VT for S390,
>>> and this would also require the dummy console (CONFIG_DUMMY_CONSOLE).
>>>
>>> Patch 1 enables the "Graphics support" menu which is
>>> needed to enable dummy console, since the VT layer needs it.
>>>
>>> Patch 2 fixes a Kconfig dependency issue for opencores
>>> framebuffer devices. This issue was exposed by the previous
>>> patch.
>>>
>>> Thanks
>>> Farhan
>>>
>>>
>>> [1]
>>> https://lists.nongnu.org/archive/html/qemu-devel/2017-09/msg04184.html
>>>
>>> Farhan Ali (2):
>>>    Kconfig : Remove HAS_IOMEM dependency for Graphics support
>>>    fbdev: Kconfig: Add HAS_IOMEM dependency for FB_OPENCORES
>>>
>>>   drivers/video/Kconfig       | 1 -
>>>   drivers/video/fbdev/Kconfig | 2 +-
>>>   2 files changed, 1 insertion(+), 2 deletions(-)
>>
>>
>> Shouldn't the order of your two patches be inverted, to avoid patch 1
>> introducing
>> build breakage fixed by patch 2?
>>
>> Gr{oetje,eeting}s,
>>
>>                          Geert
>>
>
> Hi Geert,
>
> I wasn't sure what would be the best ordering since we would never hit the
> issue if patch 1 didn't exist. But if the preference is to invert the
> ordering of patches, then I will change the ordering.

Alternatively, you can combine two patches into a single patch, which
moves the dependency from the whole subsystem to the driver that needs
it (are there more?).

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds