linux-kernel - Re: [PATCH 06/14] x86-32, NUMA: Make @size in init_aloc

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Date:	Tue, 05 Apr 2011 10:54:45 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Tejun Heo <tj@...nel.org>
CC:	mingo@...hat.com, hpa@...or.com, tglx@...utronix.de,
	rientjes@...gle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/14] x86-32, NUMA: Make @size in init_aloc_remap() represent
 bytes

On 04/04/2011 03:23 PM, Tejun Heo wrote:
> @size variable in init_alloc_remap() is confusing in that it starts as
> number of bytes as its name implies and then becomes number of pages.
> Make it consistently represent bytes.
>
> Signed-off-by: Tejun Heo<tj@...nel.org>
> Cc: Yinghai Lu<yinghai@...nel.org>
> Cc: David Rientjes<rientjes@...gle.com>
> Cc: Thomas Gleixner<tglx@...utronix.de
> Cc: Ingo Molnar<mingo@...hat.com>
> Cc: "H. Peter Anvin"<hpa@...or.com>
> ---
>   arch/x86/mm/numa_32.c |   18 +++++++-----------
>   1 files changed, 7 insertions(+), 11 deletions(-)
>
> diff --git a/arch/x86/mm/numa_32.c b/arch/x86/mm/numa_32.c
> index 30933fe..99310d2 100644
> --- a/arch/x86/mm/numa_32.c
> +++ b/arch/x86/mm/numa_32.c
> @@ -286,22 +286,19 @@ static __init unsigned long init_alloc_remap(int nid, unsigned long offset)
>   	size = node_remap_size[nid];
>   	size += ALIGN(sizeof(pg_data_t), PAGE_SIZE);
>
> -	/* convert size to large (pmd size) pages, rounding up */
> -	size = (size + LARGE_PAGE_BYTES - 1) / LARGE_PAGE_BYTES;
> -	/* now the roundup is correct, convert to PAGE_SIZE pages */
> -	size = size * PTRS_PER_PTE;
> +	/* align to large page */
> +	size = ALIGN(size, LARGE_PAGE_BYTES);
>
>   	node_pa = memblock_find_in_range(node_start_pfn[nid]<<  PAGE_SHIFT,
>   					 (u64)node_end_pfn[nid]<<  PAGE_SHIFT,
> -					 (u64)size<<  PAGE_SHIFT,
> -					 LARGE_PAGE_BYTES);
> +					 size, LARGE_PAGE_BYTES);
>   	if (node_pa == MEMBLOCK_ERROR)
>   		panic("Can not get kva ram\n");
>
> -	node_remap_size[nid] = size;
> +	node_remap_size[nid] = size>>  PAGE_SHIFT;
>   	node_remap_offset[nid] = offset;
>   	printk(KERN_DEBUG "Reserving %ld pages of KVA for lmem_map of node %d at %llx\n",
> -	       size, nid, node_pa>>  PAGE_SHIFT);
> +	       size>>  PAGE_SHIFT, nid, node_pa>>  PAGE_SHIFT);
>
>   	/*
>   	 *  prevent kva address below max_low_pfn want it on system
> @@ -315,12 +312,11 @@ static __init unsigned long init_alloc_remap(int nid, unsigned long offset)
>   	 *  So memblock_x86_reserve_range here, hope we don't run out
>   	 *  of that array
>   	 */
> -	memblock_x86_reserve_range(node_pa, node_pa + ((u64)size<<  PAGE_SHIFT),
> -				   "KVA RAM");
> +	memblock_x86_reserve_range(node_pa, node_pa + size, "KVA RAM");
>
>   	node_remap_start_pfn[nid] = node_pa>>  PAGE_SHIFT;
>
> -	return size;
> +	return size>>  PAGE_SHIFT;
>   }
>
>   static void init_remap_allocator(int nid)

Acked-by: Yinghai Lu <yinghai@...nel.org>
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