linux-kernel - Re: [PATCH -next,-tip ] kprobes: Fix Kconfig dependency

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Date:	Mon, 13 Sep 2010 09:33:48 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	linux-kernel@...r.kernel.org, 2nddept-manager@....hitachi.co.jp,
	Felipe Contreras <felipe.contreras@...il.com>,
	linux-next@...r.kernel.org,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	akpm <akpm@...ux-foundation.org>
Subject: Re: [PATCH -next,-tip ] kprobes: Fix Kconfig dependency

On 09/13/10 03:25, Masami Hiramatsu wrote:
> Fix Kconfig dependency among Kprobes, optprobe and kallsyms.
> 
> Kprobes uses kallsyms_lookup for finding target function and checking
> instruction boundary, thus CONFIG_KPROBES should select CONFIG_KALLSYMS.
> 
> Optprobe is an optional feature which is supported on x86 arch, and
> it also uses kallsyms_lookup for checking instructions in the target
> function. Since KALLSYMS_ALL just adds symbols of kernel variables,
> it doesn't need to select KALLSYMS_ALL.
> 
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Cc: Felipe Contreras <felipe.contreras@...il.com>
> Cc: Randy Dunlap <randy.dunlap@...cle.com>,
> Cc: linux-kernel@...r.kernel.org,
> Cc: linux-next@...r.kernel.org,
> Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>,
> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
> Cc: "David S. Miller" <davem@...emloft.net>,
> Cc: akpm <akpm@...ux-foundation.org>
> ---
> 
>  arch/Kconfig |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 4877a8c..fe48fc7 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -32,8 +32,9 @@ config HAVE_OPROFILE
>  
>  config KPROBES
>  	bool "Kprobes"
> -	depends on KALLSYMS && MODULES
> +	depends on MODULES
>  	depends on HAVE_KPROBES
> +	select KALLSYMS
>  	help
>  	  Kprobes allows you to trap at almost any kernel address and
>  	  execute a callback function.  register_kprobe() establishes
> @@ -45,7 +46,6 @@ config OPTPROBES
>  	def_bool y
>  	depends on KPROBES && HAVE_OPTPROBES
>  	depends on !PREEMPT
> -	select KALLSYMS_ALL
>  
>  config HAVE_EFFICIENT_UNALIGNED_ACCESS
>  	bool
> 

Fixes the kconfig dependency problem.  Thanks.

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

-- 
~Randy
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