linux-kernel - [PATCH v2] ubifs: fix kconfig dependency warning

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Date:	Tue, 29 Mar 2011 08:48:55 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	dedekind1@...il.com
Cc:	lkml <linux-kernel@...r.kernel.org>, linux-mtd@...ts.infradead.org,
	Adrian Hunter <adrian.hunter@...ia.com>
Subject: [PATCH v2] ubifs: fix kconfig dependency warning

On Tue, 29 Mar 2011 18:04:15 +0300 Artem Bityutskiy wrote:

> 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?

Here's an updated patch.  But since KALLSYMS_ALL depends on DEBUG_KERNEL,
the lines above aren't quite sufficient and I don't care to select
DEBUG_KERNEL.

---
From: Randy Dunlap <randy.dunlap@...cle.com>

Fix kconfig dependency warning 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).

Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
Cc:      Artem Bityutskiy <dedekind1@...il.com>
Cc:      Adrian Hunter <adrian.hunter@...ia.com>
Cc:      linux-mtd@...ts.infradead.org
---
 fs/ubifs/Kconfig |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- linux-next-20110328.orig/fs/ubifs/Kconfig
+++ linux-next-20110328/fs/ubifs/Kconfig
@@ -47,7 +47,8 @@ config UBIFS_FS_DEBUG
 	bool "Enable debugging support"
 	depends on UBIFS_FS
 	select DEBUG_FS
-	select KALLSYMS_ALL
+	select KALLSYMS
+	select KALLSYMS_ALL if DEBUG_KERNEL
 	help
 	  This option enables UBIFS debugging support. It makes sure various
 	  assertions, self-checks, debugging messages and test modes are compiled
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