linux-kernel - Re: [PATCH 2/3] MIPS: Loongson64: Clean up numa.c

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Date:   Sat, 10 Oct 2020 16:06:04 +0800
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Huacai Chen <chenhc@...ote.com>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xuefeng Li <lixuefeng@...ngson.cn>
Subject: Re: [PATCH 2/3] MIPS: Loongson64: Clean up numa.c



在 2020/10/9 下午6:57, Tiezhu Yang 写道:
> (1) Replace nid_to_addroffset() with nid_to_addrbase() and then remove the
> related useless code.
>
> (2) Since end_pfn = start_pfn + node_psize, use "node_psize" instead of
> "end_pfn - start_pfn" to avoid the redundant calculation.
>
> (3) After commit 6fbde6b492df ("MIPS: Loongson64: Move files to the
> top-level directory"), CONFIG_ZONE_DMA32 is always set for Loongson64
> due to MACH_LOONGSON64 selects ZONE_DMA32, so no need to use ifdef any
> more, just remove it.
>
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>

Reviewed-by: Jiaxun Yang <jiaxun.yang@...goat.com>

> ---
>   arch/mips/include/asm/mach-loongson64/mmzone.h |  6 +-----
>   arch/mips/loongson64/numa.c                    | 29 +++-----------------------
>   2 files changed, 4 insertions(+), 31 deletions(-)
>
> diff --git a/arch/mips/include/asm/mach-loongson64/mmzone.h b/arch/mips/include/asm/mach-loongson64/mmzone.h
> index 3a25dbd..c3f0f7a 100644
> --- a/arch/mips/include/asm/mach-loongson64/mmzone.h
> +++ b/arch/mips/include/asm/mach-loongson64/mmzone.h
> @@ -11,13 +11,9 @@
>   
>   #include <boot_param.h>
>   #define NODE_ADDRSPACE_SHIFT 44
> -#define NODE0_ADDRSPACE_OFFSET 0x000000000000UL
> -#define NODE1_ADDRSPACE_OFFSET 0x100000000000UL
> -#define NODE2_ADDRSPACE_OFFSET 0x200000000000UL
> -#define NODE3_ADDRSPACE_OFFSET 0x300000000000UL
>   
>   #define pa_to_nid(addr)  (((addr) & 0xf00000000000) >> NODE_ADDRSPACE_SHIFT)
> -#define nid_to_addrbase(nid) ((nid) << NODE_ADDRSPACE_SHIFT)
> +#define nid_to_addrbase(nid) ((unsigned long)(nid) << NODE_ADDRSPACE_SHIFT)
>   
>   extern struct pglist_data *__node_data[];
>   
> diff --git a/arch/mips/loongson64/numa.c b/arch/mips/loongson64/numa.c
> index ea8bb1b..cf9459f 100644
> --- a/arch/mips/loongson64/numa.c
> +++ b/arch/mips/loongson64/numa.c
> @@ -98,27 +98,6 @@ static void __init init_topology_matrix(void)
>   	}
>   }
>   
> -static unsigned long nid_to_addroffset(unsigned int nid)
> -{
> -	unsigned long result;
> -	switch (nid) {
> -	case 0:
> -	default:
> -		result = NODE0_ADDRSPACE_OFFSET;
> -		break;
> -	case 1:
> -		result = NODE1_ADDRSPACE_OFFSET;
> -		break;
> -	case 2:
> -		result = NODE2_ADDRSPACE_OFFSET;
> -		break;
> -	case 3:
> -		result = NODE3_ADDRSPACE_OFFSET;
> -		break;
> -	}
> -	return result;
> -}
> -
>   static void __init szmem(unsigned int node)
>   {
>   	u32 i, mem_type;
> @@ -146,7 +125,7 @@ static void __init szmem(unsigned int node)
>   			pr_info("       start_pfn:0x%llx, end_pfn:0x%llx, num_physpages:0x%lx\n",
>   				start_pfn, end_pfn, num_physpages);
>   			memblock_add_node(PFN_PHYS(start_pfn),
> -				PFN_PHYS(end_pfn - start_pfn), node);
> +				PFN_PHYS(node_psize), node);
>   			break;
>   		case SYSTEM_RAM_HIGH:
>   			start_pfn = ((node_id << 44) + mem_start) >> PAGE_SHIFT;
> @@ -158,7 +137,7 @@ static void __init szmem(unsigned int node)
>   			pr_info("       start_pfn:0x%llx, end_pfn:0x%llx, num_physpages:0x%lx\n",
>   				start_pfn, end_pfn, num_physpages);
>   			memblock_add_node(PFN_PHYS(start_pfn),
> -				PFN_PHYS(end_pfn - start_pfn), node);
> +				PFN_PHYS(node_psize), node);
>   			break;
>   		case SYSTEM_RAM_RESERVED:
>   			pr_info("Node%d: mem_type:%d, mem_start:0x%llx, mem_size:0x%llx MB\n",
> @@ -175,7 +154,7 @@ static void __init node_mem_init(unsigned int node)
>   	unsigned long node_addrspace_offset;
>   	unsigned long start_pfn, end_pfn;
>   
> -	node_addrspace_offset = nid_to_addroffset(node);
> +	node_addrspace_offset = nid_to_addrbase(node);
>   	pr_info("Node%d's addrspace_offset is 0x%lx\n",
>   			node, node_addrspace_offset);
>   
> @@ -242,9 +221,7 @@ void __init paging_init(void)
>   	unsigned long zones_size[MAX_NR_ZONES] = {0, };
>   
>   	pagetable_init();
> -#ifdef CONFIG_ZONE_DMA32
>   	zones_size[ZONE_DMA32] = MAX_DMA32_PFN;
> -#endif
>   	zones_size[ZONE_NORMAL] = max_low_pfn;
>   	free_area_init(zones_size);
>   }