linux-kernel - Re: [BUGFIX][ PATCH] kprobes: fix kprobe selftest configuration dependency

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Date:	Tue, 30 Jun 2009 14:38:06 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	torvalds@...ux-foundation.org, ananth@...ibm.com,
	linux-kernel@...r.kernel.org, mhiramat@...hat.com
Subject: Re: [BUGFIX][ PATCH] kprobes: fix kprobe selftest configuration
 dependency

On Mon, 22 Jun 2009 17:03:02 -0400
Masami Hiramatsu <mhiramat@...hat.com> wrote:

> Select CONFIG_KALLSYMS_ALL when CONFIG_KPROBES_SANITY_TEST=y.
> Kprobe selftest always fail without CONFIG_KALLSYMS_ALL=y, because
> kallsyms doesn't list up the target functions which are probed in this
> test.
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
> Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
> ---
> 
>  lib/Kconfig.debug |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 23067ab..661c675 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -727,6 +727,7 @@ config KPROBES_SANITY_TEST
>  	bool "Kprobes sanity tests"
>  	depends on DEBUG_KERNEL
>  	depends on KPROBES
> +	select KALLSYMS_ALL
>  	default n
>  	help
>  	  This option provides for testing basic kprobes functionality on

KALLSYMS_ALL depends on KALLSYMS, so what happens here if KALLSYMS=n?

Ah, KPROBES depends on KALLSYMS, so that problem won't be occurring.

Still, the end result is significently more complex and fragile than a
`depends on' would have been.  But I suppose we've done worse.  Oh well.


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