linux-kernel - Re: [PATCH V5 1/3] mm/nobootmem: Fix unused variable

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Date:	Mon, 20 Jan 2014 22:16:33 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Philipp Hachtmann <phacht@...ux.vnet.ibm.com>
cc:	akpm@...ux-foundation.org, hannes@...xchg.org, liuj97@...il.com,
	santosh.shilimkar@...com, grygorii.strashko@...com,
	iamjoonsoo.kim@....com, robin.m.holt@...il.com,
	tangchen@...fujitsu.com, yinghai@...nel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5 1/3] mm/nobootmem: Fix unused variable

On Mon, 20 Jan 2014, Philipp Hachtmann wrote:

> diff --git a/mm/nobootmem.c b/mm/nobootmem.c
> index e2906a5..0215c77 100644
> --- a/mm/nobootmem.c
> +++ b/mm/nobootmem.c
> @@ -116,23 +116,29 @@ 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);
>  
>  #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
> -
> -	/* 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);
> +	{
> +		phys_addr_t size;

I think you may have misunderstood Andrew's suggestion: "size" here is 
overloading the "size" you have already declared for this configuration.

Not sure why you don't just do a one line patch:

-	phys_addr_t size;
+	phys_addr_t size __maybe_unused;

to fix it.

> +		/* 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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