linux-kernel - Re: [PATCH 2/2] hwmon: Allow to compile dell-smm-hwmon driver without /proc/i8k

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Date:	Sat, 28 Mar 2015 23:44:00 +0100
From:	Paul Bolle <pebolle@...cali.nl>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Pali Rohár <pali.rohar@...il.com>,
	Steven Honeyman <stevenhoneyman@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jean Delvare <jdelvare@...e.de>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	Jochen Eisinger <jochen@...guin-breeder.org>,
	Gabriele Mazzotta <gabriele.mzt@...il.com>,
	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org
Subject: Re: [PATCH 2/2] hwmon: Allow to compile dell-smm-hwmon driver
 without /proc/i8k

Guenter Roeck schreef op za 28-03-2015 om 15:20 [-0700]:
> Maybe that is the plan, but it is not what is happening.
> I8K selects SENSORS_DELL_SMM, so a boolean I8K forces SENSORS_DELL_SMM
> to be built into the kernel.
> 
> What you suggest would work if I8K would depend on SENSORS_DELL_SMM,
> but then the symbols would not be backward-compatible.

I haven't actually looked into this part of the patch, since as far as
I'm concerned this patch is broken.

Having said that, if using a second Kconfig symbol is worth the effort,
perhaps there's also enough reason to break Kconfig backward
compatibility. People shouldn't alter Kconfig symbols just because they
can, but as far as I'm aware we're on the record to not guarantee
backward compatibility for Kconfig symbols.


Paul Bolle

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