linux-kernel - Re: [PATCH] printk: add halt_delay parameter for printk delay in halt phase

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Message-ID: <20090611144326.GB2572@ucw.cz>
Date:	Thu, 11 Jun 2009 16:43:27 +0200
From:	Pavel Machek <pavel@....cz>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] printk: add halt_delay parameter for printk delay in
	halt phase

On Tue 2009-06-02 17:54:52, Dave Young wrote:
> Add a halt_delay module parameter in printk.c used to read the printk
> messages in halt/poweroff/restart phase, delay each printk messages
> by halt_delay milliseconds. It is useful for debugging if there's no
> other way to dump kernel messages that time.
> 
> halt_delay default value is 0, change it by:
> 
> echo xxx > /sys/module/printk/parameters/halt_delay

Well, stopping oopses from scrolling offscreen was very useful for me
in past.

> +static inline void halt_delay_msec(void)
> +{
> +	if (halt_delay == 0 || !(system_state == SYSTEM_HALT
> +				|| system_state == SYSTEM_POWER_OFF
> +				|| system_state == SYSTEM_RESTART))
> +		return;
> +
> +	mdelay(halt_delay);

...but this will not trigger for oops, right?
								Pavel

-- 
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