linux-kernel - Re: [PATCH v1 1/6] PCI: brcmstb: Refactor max speed limit functionality

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Message-ID: <20250206201816.GA1000559@bhelgaas>
Date: Thu, 6 Feb 2025 14:18:16 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Jim Quinlan <james.quinlan@...adcom.com>
Cc: linux-pci@...r.kernel.org, Nicolas Saenz Julienne <nsaenz@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Cyril Brulebois <kibi@...ian.org>,
	Stanimir Varbanov <svarbanov@...e.de>,
	bcm-kernel-feedback-list@...adcom.com, jim2101024@...il.com,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Rob Herring <robh@...nel.org>,
	"moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" <linux-rpi-kernel@...ts.infradead.org>,
	"moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" <linux-arm-kernel@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/6] PCI: brcmstb: Refactor max speed limit
 functionality

On Thu, Feb 06, 2025 at 01:27:44PM -0500, Jim Quinlan wrote:
> On Thu, Feb 6, 2025 at 12:04 PM Bjorn Helgaas <helgaas@...nel.org> wrote:
> > On Wed, Feb 05, 2025 at 02:12:01PM -0500, Jim Quinlan wrote:
> > > Make changes to the code that limits the PCIe max speed.
> ...

> And here I thought that uXX_replace_bits() was the up-and-coming
> solution to be used :-)

:)  Yeah, I was kind of surprised that it isn't used more, given that
it was merged in 2017.  And it *does* reduce some repetition, which is
definitely an advantage.  But the fact that those functions are hard
to find with grep is a big turnoff for me.

I wasn't really a fan of GENMASK() and FIELD_PREP() at first either,
but now I'm a big fan because you don't need _SHIFT #defines and it
reduces shift/mask errors.  So probably the same will happen with
uXX_replace_bits().