linux-kernel - Re: [PATCH 3/3] init: Set initcall

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Date:	Tue, 19 May 2015 11:46:54 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Iulia Manda <iulia.manda21@...il.com>
Cc:	tim.bird@...ymobile.com, linux-kernel@...r.kernel.org,
	josh@...htriplett.org
Subject: Re: [PATCH 3/3] init: Set initcall_debug to a default value

On Mon, 2015-05-18 at 14:50 +0300, Iulia Manda wrote:
> Test the previously implemented macros on initcall_debug parameter, after
> setting CONFIG_CMDLINE_PARSE to 'n'.
> 
> This change is a first example for how knowing the values of kernel
> parameters at build time can allow GCC constant folding and result in an
> actually relevant decrease in size. Other types of parameters also need to
> be handled. Also, at the moment this would only work with default values.
> For being able to change those defaults and still know their values at
> compile time, a pre-compiled stand-alone parser should be run on those
> variables. This will be discussed in a following patch.
> 
> The variable corresponding to initcall_debug kernel parameter is set by
> default to false. Even though DEFINE_CORE_PARAM resumes to nothing when

resumes to nothing?

> CONFIG_CMDLINE_PARSE is not set, we need to use it in main.c so that it is
> still defined when this option is 'y'.

> ---
>  include/linux/init.h | 3 ++-
>  init/main.c          | 3 +--
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/init.h b/include/linux/init.h
> index 21b6d76..7c7ee80 100644
> --- a/include/linux/init.h
> +++ b/include/linux/init.h

> -extern bool initcall_debug;
> +DECLARE_CORE_PARAM(initcall_debug, false, bool);

CONFIG_CMDLINE_PARSE will never be set outside of x86, right? So does
this change nothing for those other architectures?
 
>  #endif
>    
> diff --git a/init/main.c b/init/main.c
> index 2115055..a7d0129 100644

> -bool initcall_debug;
> -core_param(initcall_debug, initcall_debug, bool, 0644);
> +DEFINE_CORE_PARAM(initcall_debug, initcall_debug, false, bool, 0644);

Ditto.

Thanks,


Paul Bolle

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