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

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Message-ID: <87haiovr7f.fsf@linaro.org>
Date:	Mon, 29 Apr 2013 16:43:00 -0700
From:	Kevin Hilman <khilman@...aro.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	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

"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com> 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 <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>

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
>> 
--
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