linux-kernel - Re: [PATCH 1/3] intel_idle: shrink states tables

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Message-ID: <52245AC5.2010305@linaro.org>
Date:	Mon, 02 Sep 2013 11:30:45 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
CC:	Len Brown <lenb@...nel.org>, "Rafael J. Wysocki" <rjw@...k.pl>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] intel_idle: shrink states tables

On 08/30/2013 12:25 PM, Bartlomiej Zolnierkiewicz wrote:
> There is no reason to define CPUIDLE_STATE_MAX (currently 10) entries
> in states tables if the driver always stops iterating over table when
> it encounters first .enter == NULL entry.
> 
> $ size drivers/idle/intel_idle.o.*
>    text    data     bss     dec     hex filename
>    2886    5440      32    8358    20a6 drivers/idle/intel_idle.o.before
>    2886    3752      32    6670    1a0e drivers/idle/intel_idle.o.after
> 
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
> Cc: Len Brown <lenb@...nel.org>
> ---

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>

>  drivers/idle/intel_idle.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
> index fa6964d..9c97fbb42 100644
> --- a/drivers/idle/intel_idle.c
> +++ b/drivers/idle/intel_idle.c
> @@ -123,7 +123,7 @@ static struct cpuidle_state *cpuidle_state_table;
>   * which is also the index into the MWAIT hint array.
>   * Thus C0 is a dummy.
>   */
> -static struct cpuidle_state nehalem_cstates[CPUIDLE_STATE_MAX] = {
> +static struct cpuidle_state nehalem_cstates[] = {
>  	{
>  		.name = "C1-NHM",
>  		.desc = "MWAIT 0x00",
> @@ -156,7 +156,7 @@ static struct cpuidle_state nehalem_cstates[CPUIDLE_STATE_MAX] = {
>  		.enter = NULL }
>  };
>  
> -static struct cpuidle_state snb_cstates[CPUIDLE_STATE_MAX] = {
> +static struct cpuidle_state snb_cstates[] = {
>  	{
>  		.name = "C1-SNB",
>  		.desc = "MWAIT 0x00",
> @@ -196,7 +196,7 @@ static struct cpuidle_state snb_cstates[CPUIDLE_STATE_MAX] = {
>  		.enter = NULL }
>  };
>  
> -static struct cpuidle_state ivb_cstates[CPUIDLE_STATE_MAX] = {
> +static struct cpuidle_state ivb_cstates[] = {
>  	{
>  		.name = "C1-IVB",
>  		.desc = "MWAIT 0x00",
> @@ -236,7 +236,7 @@ static struct cpuidle_state ivb_cstates[CPUIDLE_STATE_MAX] = {
>  		.enter = NULL }
>  };
>  
> -static struct cpuidle_state hsw_cstates[CPUIDLE_STATE_MAX] = {
> +static struct cpuidle_state hsw_cstates[] = {
>  	{
>  		.name = "C1-HSW",
>  		.desc = "MWAIT 0x00",
> @@ -297,7 +297,7 @@ static struct cpuidle_state hsw_cstates[CPUIDLE_STATE_MAX] = {
>  		.enter = NULL }
>  };
>  
> -static struct cpuidle_state atom_cstates[CPUIDLE_STATE_MAX] = {
> +static struct cpuidle_state atom_cstates[] = {
>  	{
>  		.name = "C1E-ATM",
>  		.desc = "MWAIT 0x00",
> @@ -628,7 +628,7 @@ static int intel_idle_cpu_init(int cpu)
>  		int num_substates, mwait_hint, mwait_cstate, mwait_substate;
>  
>  		if (cpuidle_state_table[cstate].enter == NULL)
> -			continue;
> +			break;
>  
>  		if (cstate + 1 > max_cstate) {
>  			printk(PREFIX "max_cstate %d reached\n", max_cstate);
> 


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