linux-kernel - Re: [PATCH] ACPI/HMAT: Fix the parsing of Cache Associativity and Write Policy

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Date:   Mon, 9 Dec 2019 15:43:21 +0800
From:   Tao Xu <tao3.xu@...el.com>
To:     rafael.j.wysocki@...el.com, lenb@...nel.org, keith.busch@...el.com,
        gregkh@...uxfoundation.org, dan.j.williams@...el.com,
        dave.hansen@...ux.intel.com
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI/HMAT: Fix the parsing of Cache Associativity and
 Write Policy

Gentle ping :)

On 12/2/2019 3:03 PM, Tao Xu wrote:
> In chapter 5.2.27.5, Table 5-147: Field "Cache Attributes" of
> ACPI 6.3 spec: 0 is "None", 1 is "Direct Mapped", 2 is "Complex Cache
> Indexing" for Cache Associativity; 0 is "None", 1 is "Write Back",
> 2 is "Write Through" for Write Policy.
> 
> Signed-off-by: Tao Xu <tao3.xu@...el.com>
> ---
>   drivers/acpi/numa/hmat.c | 4 ++--
>   include/linux/node.h     | 4 ++--
>   2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/acpi/numa/hmat.c b/drivers/acpi/numa/hmat.c
> index 2c32cfb72370..719d0279563d 100644
> --- a/drivers/acpi/numa/hmat.c
> +++ b/drivers/acpi/numa/hmat.c
> @@ -383,7 +383,7 @@ static __init int hmat_parse_cache(union acpi_subtable_headers *header,
>   		break;
>   	case ACPI_HMAT_CA_NONE:
>   	default:
> -		tcache->cache_attrs.indexing = NODE_CACHE_OTHER;
> +		tcache->cache_attrs.indexing = NODE_CACHE_NONE;
>   		break;
>   	}
>   
> @@ -396,7 +396,7 @@ static __init int hmat_parse_cache(union acpi_subtable_headers *header,
>   		break;
>   	case ACPI_HMAT_CP_NONE:
>   	default:
> -		tcache->cache_attrs.write_policy = NODE_CACHE_WRITE_OTHER;
> +		tcache->cache_attrs.write_policy = NODE_CACHE_WRITE_NONE;
>   		break;
>   	}
>   	list_add_tail(&tcache->node, &target->caches);
> diff --git a/include/linux/node.h b/include/linux/node.h
> index 4866f32a02d8..6dbd764d09ce 100644
> --- a/include/linux/node.h
> +++ b/include/linux/node.h
> @@ -36,15 +36,15 @@ struct node_hmem_attrs {
>   };
>   
>   enum cache_indexing {
> +	NODE_CACHE_NONE,
>   	NODE_CACHE_DIRECT_MAP,
>   	NODE_CACHE_INDEXED,
> -	NODE_CACHE_OTHER,
>   };
>   
>   enum cache_write_policy {
> +	NODE_CACHE_WRITE_NONE,
>   	NODE_CACHE_WRITE_BACK,
>   	NODE_CACHE_WRITE_THROUGH,
> -	NODE_CACHE_WRITE_OTHER,
>   };
>   
>   /**
>