linux-kernel - Re: [PATCH 2/6] PCI: Add PCI_EXP_SLTCAP_*

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Date:   Fri, 25 Feb 2022 11:51:11 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Marek Behún <kabel@...nel.org>
Cc:     Pali Rohár <pali@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Gregory Clement <gregory.clement@...tlin.com>,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] PCI: Add PCI_EXP_SLTCAP_*_SHIFT macros

On Fri, Feb 25, 2022 at 06:22:16PM +0100, Marek Behún wrote:
> On Fri, 25 Feb 2022 09:37:56 -0600
> Bjorn Helgaas <helgaas@...nel.org> wrote:

> > Yes, it's a mix.  For some recent additions, I've resisted adding the
> > _SHIFT macros on the theory that they clutter the file, they never
> > change, and the main point of the #defines is readability and so
> > grep/tags/etc can find things.
> > 
> > There are a *few* users of FIELD_PREP() and FIELD_GET():
> > 
> >   git grep -E "FIELD_(GET|PREP)\(PCI_EXP"
> > 
> > and I'm inclined to go that direction in the future.  What do you
> > think?
> 
> I am also pro that direction.
> 
> Would you also like to convert current usages in the .c driver files?
> 
> We can't remove the existing macros since they are in UAPI, but we can
> convert drivers so that they don't use _SHIFT macros.

Certainly not a high priority, but it actually looks like there aren't
*that* many uses in drivers/pci/, so I'd be OK with converting them.

Bjorn