linux-kernel - Re: [PATCH] mtd: mtdswap: make array 'name' static const, shrinks object size

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Message-ID: <20171218172134.7fa7df8c@bbrezillon>
Date:   Mon, 18 Dec 2017 17:21:34 +0100
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Colin King <colin.king@...onical.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        linux-mtd@...ts.infradead.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: mtdswap: make array 'name' static const, shrinks
 object size

On Tue, 28 Nov 2017 18:59:46 +0000
Colin King <colin.king@...onical.com> wrote:

> From: Colin Ian King <colin.king@...onical.com>
> 
> Don't populate the read-only array 'name' on the stack but instead
> make it static and constify it. Makes the object code smaller by 35
> bytes:
> 
> Before:
>    text	   data	    bss	    dec	    hex	filename
>   26304	   4444	    352	  31100	   797c	drivers/mtd/mtdswap.o
> 
> After:
>    text	   data	    bss	    dec	    hex	filename
>   26205	   4508	    352	  31065	   7959	drivers/mtd/mtdswap.o
> 
> (gcc version 7.2.0 x86_64)
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Applied.

Thanks,

Boris

> ---
>  drivers/mtd/mtdswap.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/mtdswap.c b/drivers/mtd/mtdswap.c
> index f07492c6f4b2..7eb0e1f4f980 100644
> --- a/drivers/mtd/mtdswap.c
> +++ b/drivers/mtd/mtdswap.c
> @@ -1223,8 +1223,9 @@ static int mtdswap_show(struct seq_file *s, void *data)
>  	unsigned int max[MTDSWAP_TREE_CNT];
>  	unsigned int i, cw = 0, cwp = 0, cwecount = 0, bb_cnt, mapped, pages;
>  	uint64_t use_size;
> -	char *name[] = {"clean", "used", "low", "high", "dirty", "bitflip",
> -			"failing"};
> +	static const char * const name[] = {
> +		"clean", "used", "low", "high", "dirty", "bitflip", "failing"
> +	};
>  
>  	mutex_lock(&d->mbd_dev->lock);
>