linux-kernel - Re: [PATCH] serial: turn serial console suspend a boot rather than compile time option

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Date:	Wed, 8 Aug 2007 15:41:30 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andres Salomon <dilinger@...ued.net>
Cc:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: turn serial console suspend a boot rather than
 compile time option

On Wed, 8 Aug 2007 18:35:35 -0400
Andres Salomon <dilinger@...ued.net> wrote:

> Currently, there's a CONFIG_DISABLE_CONSOLE_SUSPEND that allows one to stop
> the serial console from being suspended when the rest of the machine goes
> to sleep.  This is incredibly useful for debugging power management-related
> things; however, having it as a compile-time option has proved to be
> incredibly inconvenient for us (OLPC).  There are plenty of times that we
> want serial console to not suspend, but for the most part we'd like serial
> console to be suspended.
> 
> This drops CONFIG_DISABLE_CONSOLE_SUSPEND, and replaces it with a kernel
> boot parameter (no_console_suspend).  By default, the serial console will
> be suspended along with the rest of the system; by passing
> 'no_console_suspend' to the kernel during boot, serial console will remain
> alive during suspend.
> 
> I have another version of this patch which keeps #ifdefs around; however,
> it's uglier.  I prefer this version of the patch, and don't feel that it
> increases bloat.  If people strongly disagree, let me know and I'll submit
> the other patch.
> 

yep, compile-time options suck.

> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -172,6 +172,8 @@ extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
>  extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
>  				unsigned int interval_msec);
>  
> +extern int console_suspend;
> +

That's a somewhat vague-sounding identifier.  Could we call it
console_suspend_enabled or something?

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