linux-kernel - Re: [PATCH 14/14] GPU-DRM-TTM: Mark an array of text strings as "const" in ttm_dma_pool

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Date:   Thu, 22 Sep 2016 11:49:04 -0700
From:   Joe Perches <joe@...ches.com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        dri-devel@...ts.freedesktop.org,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Emil Velikov <emil.l.velikov@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 14/14] GPU-DRM-TTM: Mark an array of text strings as
 "const" in ttm_dma_pool_init()

On Thu, 2016-09-22 at 19:46 +0200, SF Markus Elfring wrote:
> The local variable "n" was not modified after it was initialized with
> a few text strings.
> Thus express this detail also by the data type qualifier "const".
[]
> diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
[]
> @@ -574,7 +574,7 @@ static int ttm_dma_pool_match(struct device *dev, void *res, void *match_data)
>  static struct dma_pool *ttm_dma_pool_init(struct device *dev, gfp_t flags,
>  					  enum pool_type type)
>  {
> -	char *n[] = {"wc", "uc", "cached", " dma32", "unknown",};
> +	char const * const n[] = {"wc", "uc", "cached", " dma32", "unknown",};
>  	enum pool_type t[] = {IS_WC, IS_UC, IS_CACHED, IS_DMA32, IS_UNDEFINED};


Please think a little deeper about what you are changing here
and look at the line immediately below it too.

Both should be static const to avoid unnecessary reload.