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

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Message-ID: <20180206191126.GB98765@bhelgaas-glaptop.roam.corp.google.com>
Date:   Tue, 6 Feb 2018 13:11:26 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Ulf Magnusson <ulfalizer@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        tfiga@...omium.org, paul.burton@...s.com, m.szyprowski@...sung.com,
        egtvedt@...fundet.no, linus.walleij@...aro.org,
        vgupta@...opsys.com, mgorman@...hsingularity.net, hch@....de,
        mina86@...a86.com, robh@...nel.org, sboyd@...eaurora.org,
        paulus@...abs.org, will.deacon@....com, tony@...mide.com,
        npiggin@...il.com, 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

> 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
>