linux-kernel - Re: [PATCH 1/2] UBIFS: do not select KALLSYMS

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Message-Id: <20110330154130.e62e04e0.randy.dunlap@oracle.com>
Date:	Wed, 30 Mar 2011 15:41:30 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Artem Bityutskiy <dedekind1@...il.com>
Cc:	MTD list <linux-mtd@...ts.infradead.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] UBIFS: do not select KALLSYMS_ALL

On Wed, 30 Mar 2011 11:40:15 +0300 Artem Bityutskiy wrote:

> From: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
> 
> All UBIFS needs is to make sure we stacktraces when UBIFS debugging
> is enabled. It is enough to select KALLSYMS for this, KALLSYMS_ALL
> is not necessary. Moreover, Randy Dunlap reported that UBIFS causes
> the following Kconfig dependency warning:
> 
> warning: (UBIFS_FS_DEBUG && LOCKDEP && LATENCYTOP) selects KALLSYMS_ALL
> which has unmet direct dependencies (DEBUG_KERNEL && KALLSYMS)
> 
> The reason is that KALLSYMS_ALL requires DEBUG_KERNEL and KALLSYMS, so
> ideally, to select KALLSYMS_ALL we'd need to select DEBUG_KERNEL and
> KALLSYMS first.
> 
> This seems to be too much to select. The easiest way to go is to forget
> about KALLSYMS_ALL and just select KALLSYMS when UBIFS debugging is
> enabled - that should be enough for stackdumps.
> 
> Reported-by: Randy Dunlap <randy.dunlap@...cle.com>
> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
> ---
>  fs/ubifs/Kconfig |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/ubifs/Kconfig b/fs/ubifs/Kconfig
> index d744090..f8b0160 100644
> --- a/fs/ubifs/Kconfig
> +++ b/fs/ubifs/Kconfig
> @@ -47,7 +47,7 @@ config UBIFS_FS_DEBUG
>  	bool "Enable debugging support"
>  	depends on UBIFS_FS
>  	select DEBUG_FS
> -	select KALLSYMS_ALL
> +	select KALLSYMS
>  	help
>  	  This option enables UBIFS debugging support. It makes sure various
>  	  assertions, self-checks, debugging messages and test modes are compiled
> -- 

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

Thanks.

---
~Randy
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