linux-kernel - Re: [PATCH v3 4/9] powerpc/powernv: Make power7_powersave

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Date:	Tue, 24 May 2016 14:24:06 +0530
From:	Gautham R Shenoy <ego@...ux.vnet.ibm.com>
To:	"Shreyas B. Prabhu" <shreyas@...ux.vnet.ibm.com>
Cc:	mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org,
	paulus@...abs.org, linux-kernel@...r.kernel.org, mikey@...ling.org,
	ego@...ux.vnet.ibm.com
Subject: Re: [PATCH v3 4/9] powerpc/powernv: Make power7_powersave_common
 more generic

Hi Shreyas,

On Mon, May 23, 2016 at 08:48:37PM +0530, Shreyas B. Prabhu wrote:
> power7_powersave_common does common steps needed before entering idle
> state and eventually changes MSR to MSR_IDLE and does rfid to
> power7_enter_nap_mode.
> 
> Move the updation of HSTATE_HWTHREAD_STATE to power7_powersave_common
> from power7_enter_nap_mode and make it more generic by passing the rfid
> address as a function parameter.
> 
> Also make function name more generic.
> 
> Reviewed-by: Gautham R. Shenoy <ego@...ux.vnet.ibm.com>
> Signed-off-by: Shreyas B. Prabhu <shreyas@...ux.vnet.ibm.com>
> ---
> Changes in v3:
> ==============
>  - Moved HSTATE_HWTHREAD_STATE updation to power_powersave_common
> 
>  arch/powerpc/kernel/idle_power_common.S | 30 +++++++++++++++++-------------
>  1 file changed, 17 insertions(+), 13 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/idle_power_common.S b/arch/powerpc/kernel/idle_power_common.S
> index 973c9a1..d100577 100644
> --- a/arch/powerpc/kernel/idle_power_common.S
> +++ b/arch/powerpc/kernel/idle_power_common.S
> @@ -74,8 +74,10 @@ core_idle_lock_held:
>   * To check IRQ_HAPPENED in r4
>   * 	0 - don't check
>   * 	1 - check
> + *
> + * Address to 'rfid' to in r5
>   */
> -_GLOBAL(power7_powersave_common)
> +_GLOBAL(pnv_powersave_common)

You can move this rename to the previous patch where it fits better.

[..snip..]
> 
>  	.globl	power7_enter_nap_mode
>  power7_enter_nap_mode:

Ditto. This should be "pnv_enter_idle_mode" in the previous patch.

[..snip..]
> 
>  _GLOBAL(power7_winkle)
>  	li	r3,3

	li 	r3,PNV_THREAD_WINKLE 

Which should be a separate patch.