linux-kernel - Re: [PATCH] mm/sparse: don't check return value of alloc

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Message-ID: <alpine.DEB.2.00.1212201218590.29839@chino.kir.corp.google.com>
Date:	Thu, 20 Dec 2012 12:23:38 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Sasha Levin <sasha.levin@...cle.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Gavin Shan <shangw@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/sparse: don't check return value of alloc_bootmem
 calls

On Thu, 20 Dec 2012, Sasha Levin wrote:

> diff --git a/mm/sparse.c b/mm/sparse.c
> index 6b5fb76..ae64d6e 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -403,15 +403,13 @@ void __init sparse_mem_maps_populate_node(struct page **map_map,
>  	size = PAGE_ALIGN(size);
>  	map = __alloc_bootmem_node_high(NODE_DATA(nodeid), size * map_count,
>  					 PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
> -	if (map) {
> -		for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
> -			if (!present_section_nr(pnum))
> -				continue;
> -			map_map[pnum] = map;
> -			map += size;
> -		}
> -		return;
> +	for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
> +		if (!present_section_nr(pnum))
> +			continue;
> +		map_map[pnum] = map;
> +		map += size;
>  	}
> +	return;
>  
>  	/* fallback */
>  	for (pnum = pnum_begin; pnum < pnum_end; pnum++) {

That's not true when slab_is_available() and why would you possibly add a 
return statement right before fallback code in such cases?
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