linux-kernel - Re: [PATCH 02/46] x86, mm: Split out split_mem_range from init_memory

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Message-ID: <50A1DFE1.3070809@jp.fujitsu.com>
Date:	Tue, 13 Nov 2012 14:51:29 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, Jacob Shin <jacob.shin@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/46] x86, mm: Split out split_mem_range from init_memory_mapping

2012/11/13 6:17, Yinghai Lu wrote:
> So make init_memory_mapping smaller and readable.
> 
> Suggested-by: Ingo Molnar <mingo@...e.hu>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Reviewed-by: Pekka Enberg <penberg@...nel.org>
> ---
>   arch/x86/mm/init.c |   42 ++++++++++++++++++++++++++----------------
>   1 files changed, 26 insertions(+), 16 deletions(-)
> 
> diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
> index aa5b0da..6d8e102 100644
> --- a/arch/x86/mm/init.c
> +++ b/arch/x86/mm/init.c
> @@ -146,25 +146,13 @@ static int __meminit save_mr(struct map_range *mr, int nr_range,
>   	return nr_range;
>   }
>   
> -/*
> - * Setup the direct mapping of the physical memory at PAGE_OFFSET.
> - * This runs before bootmem is initialized and gets pages directly from
> - * the physical memory. To access them they are temporarily mapped.
> - */
> -unsigned long __init_refok init_memory_mapping(unsigned long start,
> -					       unsigned long end)
> +static int __meminit split_mem_range(struct map_range *mr, int nr_range,
> +				     unsigned long start,
> +				     unsigned long end)
>   {
>   	unsigned long start_pfn, end_pfn;
> -	unsigned long ret = 0;
>   	unsigned long pos;
> -	struct map_range mr[NR_RANGE_MR];
> -	int nr_range, i;
> -
> -	printk(KERN_INFO "init_memory_mapping: [mem %#010lx-%#010lx]\n",
> -	       start, end - 1);
> -
> -	memset(mr, 0, sizeof(mr));
> -	nr_range = 0;
> +	int i;
>   
>   	/* head if not big page alignment ? */
>   	start_pfn = start >> PAGE_SHIFT;
> @@ -258,6 +246,28 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
>   			(mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":(
>   			 (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k"));
>   
> +	return nr_range;
> +}
> +
> +/*
> + * Setup the direct mapping of the physical memory at PAGE_OFFSET.
> + * This runs before bootmem is initialized and gets pages directly from
> + * the physical memory. To access them they are temporarily mapped.
> + */
> +unsigned long __init_refok init_memory_mapping(unsigned long start,
> +					       unsigned long end)
> +{
> +	struct map_range mr[NR_RANGE_MR];
> +	unsigned long ret = 0;
> +	int nr_range, i;
> +
> +	pr_info("init_memory_mapping: [mem %#010lx-%#010lx]\n",
> +	       start, end - 1);
> +
> +	memset(mr, 0, sizeof(mr));

> +	nr_range = 0;

This is unnecessary since it is set in the below.

> +	nr_range = split_mem_range(mr, nr_range, start, end);

Thanks,
Yasuaki Ishimatsu

> +
>   	/*
>   	 * Find space for the kernel direct mapping tables.
>   	 *
> 


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