Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Message-ID: <5A1E6D97.1050109@bfs.de>
Date:   Wed, 29 Nov 2017 09:19:35 +0100
From:   walter harms <wharms@bfs.de>
Reply-To: wharms@bfs.de
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; de; rv:1.9.1.16) Gecko/20101125 SUSE/3.0.11 Thunderbird/3.0.11
MIME-Version: 1.0
To:     Colin King <colin.king@canonical.com>
CC:     Linus Walleij <linus.walleij@linaro.org>,
        linux-gpio@vger.kernel.org, kernel-janitors@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] gpio: gpio-stmpe: make various char arrays static const,
 shrinks object size
References: <20171128182339.24579-1-colin.king@canonical.com>
In-Reply-To: <20171128182339.24579-1-colin.king@canonical.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


Am 28.11.2017 19:23, schrieb Colin King:
> From: Colin Ian King <colin.king@canonical.com>
> 
> Don't populate the read-only arrays edge_det_values, rise_values and
> fall_values on the stack but instead make them static and constify them.
> Makes the object code smaller by over 240 bytes:
> 
> Before:
>    text	   data	    bss	    dec	    hex	filename
>    9525	   2520	    192	  12237	   2fcd	drivers/gpio/gpio-stmpe.o
> 
> After:
>    text	   data	    bss	    dec	    hex	filename
>    9025	   2776	    192	  11993	   2ed9	drivers/gpio/gpio-stmpe.o
> 
> (gcc version 7.2.0 x86_64)
> 
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
>  drivers/gpio/gpio-stmpe.c | 24 +++++++++++++++---------
>  1 file changed, 15 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-stmpe.c b/drivers/gpio/gpio-stmpe.c
> index e6e5cca624a7..e3d048e65339 100644
> --- a/drivers/gpio/gpio-stmpe.c
> +++ b/drivers/gpio/gpio-stmpe.c
> @@ -273,15 +273,21 @@ static void stmpe_dbg_show_one(struct seq_file *s,
>  		u8 fall_reg;
>  		u8 irqen_reg;
>  
> -		char *edge_det_values[] = {"edge-inactive",
> -					   "edge-asserted",
> -					   "not-supported"};
> -		char *rise_values[] = {"no-rising-edge-detection",
> -				       "rising-edge-detection",
> -				       "not-supported"};
> -		char *fall_values[] = {"no-falling-edge-detection",
> -				       "falling-edge-detection",
> -				       "not-supported"};
> +		static const char * const edge_det_values[] = {
> +			"edge-inactive",
> +			"edge-asserted",
> +			"not-supported"
> +		};
> +		static const char * const rise_values[] = {
> +			"no-rising-edge-detection",
> +			"rising-edge-detection",
> +			"not-supported"
> +		};
> +		static const char * const fall_values[] = {
> +			"no-falling-edge-detection",
> +			"falling-edge-detection",
> +			"not-supported"
> +		};
>  		#define NOT_SUPPORTED_IDX 2

@maintainer:
the define here is hard to find, perhaps i should be move to a place
where i can be found more easily. Like the beginning of line.

re,
 wh
>  		u8 edge_det = NOT_SUPPORTED_IDX;
>  		u8 rise = NOT_SUPPORTED_IDX;

From 1585335308354949366@xxx Tue Nov 28 18:26:06 +0000 2017
X-GM-THRID: 1585335308354949366
X-Gmail-Labels: Inbox,Category Forums,HistoricalUnread