linux-kernel - Re: [PATCH 2/2] mm/sparse: add common helper to mark all memblocks present

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Message-Id: <20181107121207.62cb37cf58484b7cc80a8fd8@linux-foundation.org>
Date:   Wed, 7 Nov 2018 12:12:07 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-arch@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-sh@...r.kernel.org,
        Stephen Bates <sbates@...thlin.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Christoph Hellwig <hch@....de>, Arnd Bergmann <arnd@...db.de>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Oscar Salvador <osalvador@...e.de>
Subject: Re: [PATCH 2/2] mm/sparse: add common helper to mark all memblocks
 present

On Wed,  7 Nov 2018 10:38:59 -0700 Logan Gunthorpe <logang@...tatee.com> wrote:

> Presently the arches arm64, arm and sh have a function which loops through
> each memblock and calls memory present. riscv will require a similar
> function.
> 
> Introduce a common memblocks_present() function that can be used by
> all the arches. Subsequent patches will cleanup the arches that
> make use of this.
> 
> ...
>
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -239,6 +239,17 @@ void __init memory_present(int nid, unsigned long start, unsigned long end)
>  	}
>  }
>  
> +void __init memblocks_present(void)
> +{
> +	struct memblock_region *reg;
> +
> +	for_each_memblock(memory, reg) {
> +		memory_present(memblock_get_region_node(reg),
> +			       memblock_region_memory_base_pfn(reg),
> +			       memblock_region_memory_end_pfn(reg));
> +	}
> +}
> +

I don't like the name much.  To me, memblocks_present means "are
memblocks present" whereas this actually means "memblocks are present".
But whatever.  A little covering comment which describes what this
does and why it does it would be nice.

Acked-by: Andrew Morton <akpm@...ux-foundation.org>

I can grab both patches and shall sneak them into 4.20-rcX, but feel
free to merge them into some git tree if you'd prefer.  If I see them
turn up in linux-next I shall drop my copy.