netdev - Re: [PATCH 00/11] Add support for RaspberryPi RP1 PCI device using a DT overlay

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Message-ID: <334b382a-c9ab-47e4-b860-b8477f04c3fb@lunn.ch>
Date: Fri, 30 Aug 2024 16:10:27 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Andrea della Porta <andrea.porta@...e.com>
Cc: Krzysztof Kozlowski <krzk@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Derek Kiernan <derek.kiernan@....com>,
	Dragan Cvetic <dragan.cvetic@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nicolas Ferre <nicolas.ferre@...rochip.com>,
	Claudiu Beznea <claudiu.beznea@...on.dev>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Saravana Kannan <saravanak@...gle.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>, linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org, netdev@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-arch@...r.kernel.org,
	Lee Jones <lee@...nel.org>, Stefan Wahren <wahrenst@....net>
Subject: Re: [PATCH 00/11] Add support for RaspberryPi RP1 PCI device using a
 DT overlay

> On a second thought, are you really sure we want to proceed with the header file?
> After all the only line in it would be the extern declaration and the only one to
> include it would be rp1-dev.c. Moreover, an header file would convey the false
> premise that you can include it and use that symbol while in fact it should be
> only used inside the driver.
> OTOH, not creating that header file will continue to trigger the warning...

The header file does not need to be in global scope. It could be in
the driver source directory. As such, nothing outside of the driver
can use it.

Headers like this have multiple proposes. One is they make a symbol
visible to the linker. But having two different .c files include the
header enables type checking, which for long term maintenance is just
as important. So a one line header is fine.

	Andrew