linux-kernel - Re: [PATCH] dma-debug: fix displaying of dma allocation type

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Date:   Wed, 8 Apr 2020 20:49:58 +0200
From:   Christoph Hellwig <hch@....de>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org, Sekhar Nori <nsekhar@...com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma-debug: fix displaying of dma allocation type

On Wed, Apr 08, 2020 at 09:48:04PM +0300, Grygorii Strashko wrote:
> The commit 2e05ea5cdc1a ("dma-mapping: implement dma_map_single_attrs using
> dma_map_page_attrs") removed "dma_debug_page" enum, but missed to update
> type2name string table. This causes incorrect displaying of dma allocation
> type. Fix it by removing "page" string from type2name string table.
> 
> Before (dma_alloc_coherent()):
> k3-ringacc 4b800000.ringacc: scather-gather idx 2208 P=d1140000 N=d114 D=d1140000 L=40 DMA_BIDIRECTIONAL dma map error check not applicable
> k3-ringacc 4b800000.ringacc: scather-gather idx 2216 P=d1150000 N=d115 D=d1150000 L=40 DMA_BIDIRECTIONAL dma map error check not applicable
> 
> After:
> k3-ringacc 4b800000.ringacc: coherent idx 2208 P=d1140000 N=d114 D=d1140000 L=40 DMA_BIDIRECTIONAL dma map error check not applicable
> k3-ringacc 4b800000.ringacc: coherent idx 2216 P=d1150000 N=d115 D=d1150000 L=40 DMA_BIDIRECTIONAL dma map error check not applicable
> 
> Fixes: 2e05ea5cdc1a ("dma-mapping: implement dma_map_single_attrs using dma_map_page_attrs")
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> ---
>  kernel/dma/debug.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
> index 2031ed1ad7fa..09b85ba0c137 100644
> --- a/kernel/dma/debug.c
> +++ b/kernel/dma/debug.c
> @@ -137,7 +137,7 @@ static const char *const maperr2str[] = {
>  	[MAP_ERR_CHECKED] = "dma map error checked",
>  };
>  
> -static const char *type2name[5] = { "single", "page",
> +static const char *type2name[5] = { "single",
>  				    "scather-gather", "coherent",
>  				    "resource" };

To make sure this doesn't happen anymore, can you switch to
named initializers?