linux-kernel - Re: [PATCH] idle: fix hlt/nohlt command-line handling in new generic idle

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Date:	Thu, 25 Apr 2013 12:12:17 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Kevin Hilman <khilman@...aro.org>
CC:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Magnus Damm <magnus.damm@...il.com>
Subject: Re: [PATCH] idle: fix hlt/nohlt command-line handling in new generic
 idle

On 04/25/2013 05:49 AM, Kevin Hilman wrote:
> commit d1669912 (idle: Implement generic idle function) added a new
> generic idle along with support for hlt/nohlt command line options to
> override default idle loop behavior.  However, the command-line
> processing is never compiled.
> 
> The command-line handling is wrapped by CONFIG_GENERIC_IDLE_POLL_SETUP
> and arches that use this feature select it in their Kconfigs.
> However, no Kconfig definition was created for this option, so it is
> never enabled, and therefore command-line override of the idle-loop
> behavior is broken after migrating to the generic idle loop.
> 
> To fix, add a Kconfig definition for GENERIC_IDLE_POLL_SETUP.
> 
> Tested on ARM (OMAP4/Panda) which enables the command-line overrides
> by default.
> 
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Rusty Russell <rusty@...tcorp.com.au>
> Cc: Paul McKenney <paulmck@...ux.vnet.ibm.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
> Cc: Magnus Damm <magnus.damm@...il.com>
> Signed-off-by: Kevin Hilman <khilman@...aro.org>
> ---

Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>

Regards,
Srivatsa S. Bhat

> Applies on tip/smp/hotplug where generic idle feature is added
>
>  arch/Kconfig | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 1455579..e0ef57b 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -216,6 +216,9 @@ config USE_GENERIC_SMP_HELPERS
>  config GENERIC_SMP_IDLE_THREAD
>         bool
> 
> +config GENERIC_IDLE_POLL_SETUP
> +       bool
> +
>  # Select if arch init_task initializer is different to init/init_task.c
>  config ARCH_INIT_TASK
>         bool
> 

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