linux-kernel - Re: [PATCHv2 3/4] mm: pack compound_dtor and compound

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Message-ID: <20150818160530.GM5033@dhcp22.suse.cz>
Date:	Tue, 18 Aug 2015 18:05:31 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	David Rientjes <rientjes@...gle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv2 3/4] mm: pack compound_dtor and compound_order into one
 word in struct page

On Mon 17-08-15 18:09:04, Kirill A. Shutemov wrote:
[...]
> +/* Keep the enum in sync with compound_page_dtors array in mm/page_alloc.c */
> +enum {
> +	NULL_COMPOUND_DTOR,
> +	COMPOUND_PAGE_DTOR,
> +	HUGETLB_PAGE_DTOR,
> +	NR_COMPOUND_DTORS,
> +};
[...]
> +static void free_compound_page(struct page *page);
> +compound_page_dtor * const compound_page_dtors[] = {
> +	NULL,
> +	free_compound_page,
> +	free_huge_page,
> +};
> +

Both need ifdef CONFIG_HUGETLB_PAGE as my compile test batter just found
out.
-- 
Michal Hocko
SUSE Labs
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