linux-kernel - Re: [PATCH ] printk: add module parameter console_suspend to control console_suspend

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Message-ID: <CABqxG0dGePQYLdcJKcSjoH+=tV89oyb95TFWCKdhb3kCM-T6sQ@mail.gmail.com>
Date:	Tue, 9 Aug 2011 17:59:30 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	yanmin_zhang@...ux.intel.com
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH ] printk: add module parameter console_suspend to control console_suspend_enabled

Hi,

On Tue, Aug 9, 2011 at 4:55 PM, Yanmin Zhang
<yanmin_zhang@...ux.intel.com> wrote:
> On Tue, 2011-08-09 at 16:01 +0800, Dave Young wrote:
>> On Tue, Aug 9, 2011 at 11:09 AM, Yanmin Zhang
>> <yanmin_zhang@...ux.intel.com> wrote:
>> > We are enabling some power features on medfield. To test suspend-2-RAM
>> > conveniently, we need turn on/off console_suspend_enabled frequently.
>> >
>> > Below patch adds a module parameter, so users could change it by:
>> > /sys/module/printk/parameters/console_suspend_enabled
>>
>> What about change name to no_console_suspend? Or it will be weird if
>> boot kernel with both no_console_suspend and
>> printk.console_suspend_enabled set.
> Thanks for the comments. How about changing the name to console_suspend?
> If changing it to no_console_suspend, we can't map the input to console_suspend_enabled
> directly.

How about use module_param_cb instead of module_param_named?

>
> Below is the new patch.
>
> ---
>
> We are enabling some power features on medfield. To test suspend-2-RAM
> conveniently, we need turn on/off console_suspend_enabled frequently.
>
> Below patch adds a module parameter, so users could change it by:
> /sys/module/printk/parameters/console_suspend
>
> Signed-off-by: Yanmin Zhang <yanmin_zhang@...ux.intel.com>
>
> ---
>  kernel/printk.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/kernel/printk.c b/kernel/printk.c
> index 37dff34..1decef6 100644
> --- a/kernel/printk.c
> +++ b/kernel/printk.c
> @@ -1106,6 +1106,8 @@ static int __init console_suspend_disable(char *str)
>        return 1;
>  }
>  __setup("no_console_suspend", console_suspend_disable);
> +module_param_named(console_suspend, console_suspend_enabled,
> +               bool, S_IRUGO | S_IWUSR);
>
>  /**
>  * suspend_console - suspend the console subsystem
> --
> 1.7.1
>
>
>
>



-- 
Regards
Yang RuiRui
--
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