linux-kernel - Re: [PATCH 1/2] mm/sparsemem: Defer the ms->section_mem

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Date:   Thu, 1 Feb 2018 06:15:45 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Baoquan He <bhe@...hat.com>, linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, akpm@...ux-foundation.org,
        kirill.shutemov@...ux.intel.com, mhocko@...e.com,
        tglx@...utronix.de, douly.fnst@...fujitsu.com
Subject: Re: [PATCH 1/2] mm/sparsemem: Defer the ms->section_mem_map clearing
 a little later

On 01/31/2018 11:19 PM, Baoquan He wrote:
>  	for_each_present_section_nr(0, pnum) {
> +		struct mem_section *ms;
> +		ms = __nr_to_section(pnum);
>  		usemap = usemap_map[pnum];
> -		if (!usemap)
> +		if (!usemap) {
> +#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
> +			ms->section_mem_map = 0;
> +#endif
>  			continue;
> +		}
>  
>  #ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
>  		map = map_map[pnum];
>  #else
>  		map = sparse_early_mem_map_alloc(pnum);
>  #endif
> -		if (!map)
> +		if (!map) {
> +#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
> +			ms->section_mem_map = 0;
> +#endif
>  			continue;
> +		}

This is starting to look like code that only a mother could love.  Can
this be cleaned up a bit?