linux-kernel - Re: [patch 1/4] fastboot: make fastboot a config option

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Message-Id: <20080730082335.4da1296f.randy.dunlap@oracle.com>
Date:	Wed, 30 Jul 2008 08:23:35 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu,
	Simon Arlott <simon@...e.lp0.eu>,
	Daniel Walker <dwalker@...sta.com>,
	Rene Herman <rene.herman@...access.nl>
Subject: Re: [patch 1/4] fastboot: make fastboot a config option

On Sun, 20 Jul 2008 15:12:34 -0700 Arjan van de Ven wrote:

> 
> From: Arjan van de Ven <arjan@...ux.intel.com>
> Date: Sun, 20 Jul 2008 10:20:49 -0700
> Subject: [PATCH] fastboot: make fastboot a config option
> 
> to mitigate the risks of async bootup, make fastboot a configuration
> option...
> 
> Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> ---
>  init/Kconfig |   11 +++++++++++
>  init/main.c  |    4 ++++
>  2 files changed, 15 insertions(+), 0 deletions(-)
> 
> diff --git a/init/Kconfig b/init/Kconfig
> index 6199d11..7545c8b 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -524,6 +524,17 @@ config CC_OPTIMIZE_FOR_SIZE
>  
>  	  If unsure, say N.
>  
> +config FASTBOOT
> +	bool "Fast boot support"
> +	help
> +	  The fastboot option will cause the kernel to try to optimize
> +	  for faster boot. 
> +
> +	  This includes doing some of the device initialization asynchronous

	                                                        asynchronously

> +	  as well as opportunistically trying to mount the root fs early.
> +
> +	  If unsure, say N.
> +
>  config SYSCTL
>  	bool
>  
> diff --git a/init/main.c b/init/main.c
> index 6be1756..bb97add 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -776,7 +776,11 @@ static void __init do_initcalls(void)
>  	for (call = __initcall_start; call < __initcall_end; call++) {
>  		if (phase == 0 && call >= __async_initcall_start) {
>  			phase = 1;
> +#ifdef CONFIG_FASTBOOT
>  			queue_work(async_init_wq, &async_work);
> +#else
> +			do_async_initcalls(NULL);
> +#endif
>  		}
>  		if (phase == 1 && call >= __async_initcall_end)
>  			phase = 2;
> -- 

---
~Randy
Linux Plumbers Conference, 17-19 September 2008, Portland, Oregon USA
http://linuxplumbersconf.org/
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