linux-kernel - Re: [PATCH] cpufreq: speedstep-lib: make several arrays static, makes code smaller

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Message-ID: <3397376.XDXHdZtiYO@aspire.rjw.lan>
Date:   Thu, 31 Aug 2017 01:32:53 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Colin King <colin.king@...onical.com>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>, linux-pm@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: speedstep-lib: make several arrays static, makes code smaller

On Friday, August 25, 2017 7:00:16 PM CEST Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Don't populate arrays on the stack, instead make them static.
> Makes the object code smaller by over 860 bytes:
> 
> Before:
>    text	   data	    bss	    dec	    hex	filename
>   10716	   5196	      0	  15912	   3e28	drivers/cpufreq/speedstep-lib.o
> 
> After:
>    text	   data	    bss	    dec	    hex	filename
>    9690	   5356	      0	  15046	   3ac6	drivers/cpufreq/speedstep-lib.o
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/cpufreq/speedstep-lib.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/cpufreq/speedstep-lib.c b/drivers/cpufreq/speedstep-lib.c
> index 1b8062182c81..ccab452a4ef5 100644
> --- a/drivers/cpufreq/speedstep-lib.c
> +++ b/drivers/cpufreq/speedstep-lib.c
> @@ -35,7 +35,7 @@ static int relaxed_check;
>  static unsigned int pentium3_get_frequency(enum speedstep_processor processor)
>  {
>  	/* See table 14 of p3_ds.pdf and table 22 of 29834003.pdf */
> -	struct {
> +	static const struct {
>  		unsigned int ratio;	/* Frequency Multiplier (x10) */
>  		u8 bitmap;		/* power on configuration bits
>  					[27, 25:22] (in MSR 0x2a) */
> @@ -58,7 +58,7 @@ static unsigned int pentium3_get_frequency(enum speedstep_processor processor)
>  	};
>  
>  	/* PIII(-M) FSB settings: see table b1-b of 24547206.pdf */
> -	struct {
> +	static const struct {
>  		unsigned int value;	/* Front Side Bus speed in MHz */
>  		u8 bitmap;		/* power on configuration bits [18: 19]
>  					(in MSR 0x2a) */
> 

Applied, thanks!