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

From: [email-masked] (Kevin Hilman)
Date: Mon, 29 Apr 2013 16:43:00 -0700

"Srivatsa S. Bhat" <[email-masked]> writes:

> 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 <[email-masked]>
>> Cc: Linus Torvalds <[email-masked]>
>> Cc: Rusty Russell <[email-masked]>
>> Cc: Paul McKenney <[email-masked]>
>> Cc: Peter Zijlstra <[email-masked]>
>> Cc: Srivatsa S. Bhat <[email-masked]>
>> Cc: Magnus Damm <[email-masked]>
>> Signed-off-by: Kevin Hilman <[email-masked]>
>> ---
>
> Reviewed-by: Srivatsa S. Bhat <[email-masked]>

Thanks for the review.

>> Applies on tip/smp/hotplug where generic idle feature is added

Thomas, can this get into tip/smp/hotplug so the command-line override
is not broken in v3.10?

Thanks,

Kevin

>>
>>  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
>>