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

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Date:	Thu, 16 Jan 2014 14:43:11 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Philipp Hachtmann <phacht@...ux.vnet.ibm.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>, 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
Subject: Re: [PATCH] mm/nobootmem: Fix unused variable

On Thu, 16 Jan 2014, Philipp Hachtmann wrote:

> diff --git a/mm/nobootmem.c b/mm/nobootmem.c
> index e2906a5..12cbb04 100644
> --- 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);
>  

Two options: (1) add a helper function declared for 
CONFIG_ARCH_DISCARD_MEMBLOCK that returns the count to add and is empty 
otherwise, or (2) initialize size to zero in its definition.  It's much 
better than #ifdef's inside the function for a variable declaration.

Also, since this is already in -mm, you'll want this fix folded into the 
original patch, "mm/nobootmem: free_all_bootmem again", so it's probably 
best to name it "mm/nobootmem: free_all_bootmem again fix".
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