linux-kernel - Re: [PATCH v6 08/10] misc: rp1: RaspberryPi RP1 misc driver

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Message-ID: <Z4-5GvpJfqkad-6A@apocalypse>
Date: Tue, 21 Jan 2025 16:11:22 +0100
From: Andrea della Porta <andrea.porta@...e.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Andrea della Porta <andrea.porta@...e.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.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>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczynski <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Bartosz Golaszewski <brgl@...ev.pl>,
	Derek Kiernan <derek.kiernan@....com>,
	Dragan Cvetic <dragan.cvetic@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Saravana Kannan <saravanak@...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-pci@...r.kernel.org, linux-gpio@...r.kernel.org,
	Masahiro Yamada <masahiroy@...nel.org>,
	Stefan Wahren <wahrenst@....net>,
	Herve Codina <herve.codina@...tlin.com>,
	Luca Ceresoli <luca.ceresoli@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v6 08/10] misc: rp1: RaspberryPi RP1 misc driver

Hi Andrew,

On 15:53 Tue 21 Jan     , Andrew Lunn wrote:
> > > Well where are those externs defined at?  Shouldn't there be a .h file
> > > for them somewhere in the tree if they really are global?
> > 
> > Those symbols are deined in drivers/misc/rp1/rp1-pci.dtbo.S (added by
> > this patchset) and created by cmd_wrap_S_dtb in scripts/Makefile.lib.
> 
> Could cmd_wrap_S_dtb be extended to actually produce a header?

It will produce a header nonetheless, one which is needed by just one .c
file violating Greg's rule about having a header only if referenced by more
than one source and the symbol is truly global, IMHO.

Thanks,
Andrea

> 
> But that might confuse static analysers?
> 
> 	Andrew