linux-kernel - Re: [PATCH] net: trivial MLX4

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Date:	Thu, 10 May 2007 17:41:21 +0530
From:	"Satyam Sharma" <satyam.sharma@...il.com>
To:	"Roland Dreier" <rdreier@...co.com>
Cc:	"Paul Mundt" <lethal@...ux-sh.org>,
	"Roland Dreier" <rolandd@...co.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: trivial MLX4_DEBUG dependency fix.

Hi,

On 5/10/07, Roland Dreier <rdreier@...co.com> wrote:
>  > CONFIG_MLX4_DEBUG works out to a def_bool y for those that
>  > have CONFIG_EMBEDDED set. Make it depend on MLX4_CORE..
>
> Thanks, applied...  (by the way, this bug just results in an
> extraneous CONFIG variable being defined, right?  There's no further
> breakage -- or am I misunderstanding the situation?)

Yeah, it won't cause any build breakage. It doesn't cause anything to
even get _built_ actually, because of the way this config option is
used directly in the .h and .c sources in drivers/net/mlx4/ (which is
itself compiled only when MLX4_CORE=y or m), and not in a Makefile.

>  > I'll let someone else wonder why debugging output is default enabled,
>  > this seems to be a worrying trend as of late.
>
> Actually this option just controls whether to build the debugging
> output at all.  The output is controlled at runtime with a module
> parameter (which can be changed via sysfs after the module is loaded),
> and the output defaults to off.
>
> The reason why I want building the debugging stuff to default to y is
> so that distros automatically build modules with debugging enabled.
> Otherwise it's a pain to try and gather info from someone who has
> problems with a kernel they didn't build.

IMHO default configs must be aimed at production usage scenarios, so
are better off without debugging enabled by default. Except if the
driver is really new / EXPERIMENTAL where the goal is to get it tested
out by all users asap (and no production systems would be using it
anyway).

Just my 2 paise,
Satyam
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