linux-kernel - Re: [PATCH] mm/nobootmem: Fix unused variable

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Date:	Fri, 17 Jan 2014 13:38:31 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Philipp Hachtmann <phacht@...ux.vnet.ibm.com>
Cc:	hannes@...xchg.org, liuj97@...il.com, santosh.shilimkar@...com,
	grygorii.strashko@...com, iamjoonsoo.kim@....com,
	robin.m.holt@...il.com, yinghai@...nel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH] mm/nobootmem: Fix unused variable

On Thu, 16 Jan 2014 14:33:06 +0100 Philipp Hachtmann <phacht@...ux.vnet.ibm.com> wrote:

> This fixes an unused variable warning in nobootmem.c
> 
> ...
>
> --- a/mm/nobootmem.c
> +++ b/mm/nobootmem.c
> @@ -116,9 +116,13 @@ static unsigned long __init __free_memory_core(phys_addr_t start,
>  static unsigned long __init free_low_memory_core_early(void)
>  {
>  	unsigned long count = 0;
> -	phys_addr_t start, end, size;
> +	phys_addr_t start, end;
>  	u64 i;
>  
> +#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
> +	phys_addr_t size;
> +#endif
> +
>  	for_each_free_mem_range(i, NUMA_NO_NODE, &start, &end, NULL)
>  		count += __free_memory_core(start, end);

Yes, that is a bit of an eyesore.  We often approach the problem this
way, which is nicer:

static unsigned long __init free_low_memory_core_early(void)
{
	unsigned long count = 0;
	phys_addr_t start, end;
	u64 i;

	for_each_free_mem_range(i, NUMA_NO_NODE, &start, &end, NULL)
		count += __free_memory_core(start, end);

#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
	{
		phys_addr_t size;

		/* Free memblock.reserved array if it was allocated */
		size = get_allocated_memblock_reserved_regions_info(&start);
		if (size)
			count += __free_memory_core(start, start + size);

		/* Free memblock.memory array if it was allocated */
		size = get_allocated_memblock_memory_regions_info(&start);
		if (size)
			count += __free_memory_core(start, start + size);
	}
#endif

	return count;
}

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