linux-kernel - Re: [PATCH] ubifs: fix kconfig dependency warning

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Date:	Tue, 29 Mar 2011 18:04:15 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	lkml <linux-kernel@...r.kernel.org>, linux-mtd@...ts.infradead.org,
	Adrian Hunter <adrian.hunter@...ia.com>
Subject: Re: [PATCH] ubifs: fix kconfig dependency warning

On Tue, 2011-03-29 at 08:01 -0700, Randy Dunlap wrote:
> On 03/29/11 00:02, Artem Bityutskiy wrote:
> > On Mon, 2011-03-28 at 13:40 -0700, Randy Dunlap wrote:
> >> From: Randy Dunlap <randy.dunlap@...cle.com>
> >>
> >> Fix another kconfig dependency warning, this time in ubifs.
> >>
> >> warning: (UBIFS_FS_DEBUG && LOCKDEP && LATENCYTOP) selects KALLSYMS_ALL which has unmet direct dependencies (DEBUG_KERNEL && KALLSYMS)
> >>
> >> Without this patch, we can have:
> >> # CONFIG_KALLSYMS is not set
> >> CONFIG_KALLSYMS_ALL=y
> >> which is useless (does nothing unless KALLSYMS is enabled).
> >>
> >> However, ubifs builds successfully with or without this patch,
> >> and it builds with this line completely deleted,
> >> so what was this 'select' for?  Just developer convenience?
> > 
> > Well, here is the idea. You can compile UBIFS with debugging and without
> > debugging. Without debugging the resulting ubifs.ko is much smaller, so
> > some embedded people prefer it this way.
> > 
> > If you select debugging support, then we'll compile it a lot of
> > assertions, self-checks, test-modes, extra error messages with detailed
> > dumps. And we want to see stackdumps when errors or problems happen,
> > this is why we select KALLSYMS_ALL.
> > 
> > So I guess instead we should do:
> > 
> > select KALLSYMS
> > select KALLSYMS_ALL
> 
> Yes, that should do it.  Thanks for the explanation.

Will you submit a patch? Alternatively, I can make it myself. What is
your preference?

And I'll merge it upstream this cycle (before 2.6.39) then.

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)

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