linux-kernel - Re: [PATCH 20/20] x86/PCI: VMD: Fix malformed default

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Date:   Tue, 6 Feb 2018 23:17:05 +0100
From:   Ulf Magnusson <ulfalizer@...il.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        tfiga@...omium.org, paul.burton@...s.com,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Hans-Christian Noren Egtvedt <egtvedt@...fundet.no>,
        Linus Walleij <linus.walleij@...aro.org>,
        Vineet Gupta <vgupta@...opsys.com>,
        mgorman@...hsingularity.net, Christoph Hellwig <hch@....de>,
        mina86@...a86.com, Rob Herring <robh@...nel.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Paul Mackerras <paulus@...abs.org>,
        Will Deacon <will.deacon@....com>,
        Tony Lindgren <tony@...mide.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org
Subject: Re: [PATCH 20/20] x86/PCI: VMD: Fix malformed default

On Tue, Feb 6, 2018 at 8:11 PM, Bjorn Helgaas <helgaas@...nel.org> wrote:
>> x86/PCI: VMD: Fix malformed default
>
> In the title, please include a clue about what default you're talking
> about, e.g., mention Kconfig somehow.
>
> On Mon, Feb 05, 2018 at 02:21:32AM +0100, Ulf Magnusson wrote:
>> 'default N' should be 'default n', though they happen to have the same
>> effect here, due to undefined symbols (N in this case) evaluating to n
>> in a tristate sense.
>>
>> Remove the default from VMD instead of changing it. bool and tristate
>> symbols implicitly default to n.
>>
>> Discovered with the
>> https://github.com/ulfalizer/Kconfiglib/blob/master/examples/list_undefined.py
>> script.
>>
>> Signed-off-by: Ulf Magnusson <ulfalizer@...il.com>
>> ---
>>  drivers/pci/host/Kconfig | 1 -
>>  1 file changed, 1 deletion(-)
>>
>> diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
>> index a4ed7484d127..dc8a2a175f19 100644
>> --- a/drivers/pci/host/Kconfig
>> +++ b/drivers/pci/host/Kconfig
>> @@ -215,7 +215,6 @@ config PCIE_TANGO_SMP8759
>>  config VMD
>>       depends on PCI_MSI && X86_64 && SRCU
>>       tristate "Intel Volume Management Device Driver"
>> -     default N
>>       ---help---
>>         Adds support for the Intel Volume Management Device (VMD). VMD is a
>>         secondary PCI host bridge that allows PCI Express root ports,
>> --
>> 2.14.1
>>

Typoed the --in-reply-to. v2 is at https://lkml.org/lkml/2018/2/6/770

Cheers,
Ulf