linux-kernel - Re: [build bug] drivers/built-in.o: In function `rt2x00leds_resume': : undefined reference to `led_classdev

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Message-Id: <20080420.024704.02026708.davem@davemloft.net>
Date:	Sun, 20 Apr 2008 02:47:04 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ivdoorn@...il.com
Cc:	mingo@...e.hu, linville@...driver.com, tomas.winkler@...el.com,
	linux-kernel@...r.kernel.org, kaber@...sh.net,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	mabbas@...ux.intel.com, ischram@...enet.be, rjw@...k.pl
Subject: Re: [build bug] drivers/built-in.o: In function
 `rt2x00leds_resume': : undefined reference to `led_classdev_resume'

From: Ivo van Doorn <ivdoorn@...il.com>
Date: Sun, 20 Apr 2008 11:31:00 +0200

> Not sure about it, but doesn't LEDS_CLASS depend on NEW_LEDS ?
> Which would make selecting LEDS_CLASS broken when NEW_LEDS isn't enabled?

True, what an awful dependency chain.

NEW_LEDS requires HAS_IOMEM.  This is to handle platforms like
S390 and UM.

But I think this protection is overboard.  Specific drivers
might need IOMEM functionality, but the basic infrastructure
does not.

All of the core infrastrucure and generic LEDS facilities, including
NEW_LEDS, LEDS_CLASS, and LEDS_TRIGGERS, don't need the IOMEM
protection.

And neither do the LED device drivers, they already each have a
depenency for a specific platform.

You could even imagine a hypervisor based LED driver that a platform
like S390, which does not enable HAS_IOMEM, might want to support
under this infrastructure.

I think NEW_LEDS can be completely eliminated.
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