linux-kernel - Re: build failure due to ROOT_DEV in mtd module (was Re: linux-2. 6.22-rc5-g7c8545e build #298 failed ...)

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Date:	Thu, 21 Jun 2007 16:06:58 -0700
From:	Marc St-Jean <Marc_St-Jean@...-sierra.com>
To:	Satyam Sharma <satyam.sharma@...il.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Satyam Sharma <satyam.sharma@...il.com>,
	Tom Spink <tspink@...il.com>,
	Toralf F?rster <toralf.foerster@....de>,
	linux-kernel@...r.kernel.org,
	Paolo Giarrusso <blaisorblade@...oo.it>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org, linux-mips@...ux-mips.org,
	Brian Oostenbrink <Brian_Oostenbrink@...-sierra.com>,
	Dan Doucette <Dan_Doucette@...-sierra.com>
Subject: Re: build failure due to ROOT_DEV in mtd module (was Re: linux-2.
	6.22-rc5-g7c8545e build #298 failed ...)

> On Thu, Jun 21, 2007 at 04:13:27 EST, Satyam Sharma wrote:
> On 6/21/07, Christoph Hellwig <hch@...radead.org> wrote:
>> On Thu, Jun 21, 2007 at 12:22:01PM +0530, Satyam Sharma wrote:
>> > >> The build seems to fail because of:
>> > >> ERROR: "ROOT_DEV" [drivers/mtd/maps/nettel.ko] undefined!
>> > >>
>> > >> After taking a quick look at the code, I can't immediately see why
>> > >> this would be, since there is an include for linux/root_dev.h at the
>> > >> top, there.
>> > >>
>> > >> There's only one occurrence of ROOT_DEV (line 425), and after a quick
>> > >> look at the git history, it seems the include was originally missing,
>> > >> but was put back in, in commit
>> > >> 6cc449c7d0292cb9b993f0df84fd3225e3099492.
>>
>> Please just the reference to ROOT_DEV from this driver.  Just because
>> someone builds this driver there should be no change in the default root
>> device.
> 
> I agree, but this (drivers/mtd/maps/nettel.c) isn't the only modular driver
> referencing ROOT_DEV. We also have drivers/mtd/maps/pmcmsp-ramroot.c
> using ROOT_DEV (in fact the purpose of that driver seems to be precisely
> to special-case the root fs and do something with it ...) but considering
> that other driver's (tristate) Kconfig option depends on another symbol that
> is non-existent in the mainline tree, there is no way someone can build
> pmcmsp-ramroot and so we'll never actually  hit that problem even with an
> allmodconfig build.
> 
> Anyway, I'll leave this up to David / linux-mtd to sort out. [ No other
> modular user of ROOT_DEV in the tree other than the two mtd drivers
> mentioned here. ]han the two mtd drivers
> mentioned here. ]]

Hi Satyam,

The support for the platform which introduced drivers/mtd/maps/pmcmsp-ramroot.c
is being queued in the linux-mips tree at linux-mips.org. At some point it should
work it's way to the main tree and be buildable.

Marc
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