linux-kernel - Re: [PATCH 1/8] mm/memblock: memblock_is_map/region

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Date:   Tue, 12 Dec 2017 08:03:11 -0800
From:   Joe Perches <joe@...ches.com>
To:     Yaowei Bai <baiyaowei@...s.chinamobile.com>,
        akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/8] mm/memblock: memblock_is_map/region_memory can be
 boolean

On Mon, 2017-12-11 at 21:55 -0500, Yaowei Bai wrote:
> This patch makes memblock_is_map/region_memory return bool due to these
> two functions only using either true or false as its return value.
[]
> @@ -1690,13 +1690,13 @@ int __init_memblock memblock_search_pfn_nid(unsigned long pfn,
>   * RETURNS:
>   * 0 if false, non-zero if true
>   */
> -int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size)
> +bool __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size)
>  {
>  	int idx = memblock_search(&memblock.memory, base);
>  	phys_addr_t end = base + memblock_cap_size(base, &size);
>  
>  	if (idx == -1)
> -		return 0;
> +		return false;
>  	return (memblock.memory.regions[idx].base +
>  		 memblock.memory.regions[idx].size) >= end;
>  }

I'd be more inclined to use a temporary for
memblock.memory.regions[idx] so the function was
something like:

int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size)
{
	phys_addr_t end;
	struct memblock_region *region;
	int idx = memblock_search(&memblock.memory, base);

	if (idx == -1)
		return 0;

	end = base + memblock_cap_size(base, &size);
	region = &memblock.memory.regions[idx];

	return (region->base + region->size) >= end;
}

Maybe change to bool at your option.