linux-kernel - Re: [PATCH 04/11] ARCv2: mm: THP support

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Message-ID: <20150827153254.GA21103@node.dhcp.inet.fi>
Date:	Thu, 27 Aug 2015 18:32:54 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	Minchan Kim <minchan@...nel.org>, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	arc-linux-dev@...opsys.com
Subject: Re: [PATCH 04/11] ARCv2: mm: THP support

On Thu, Aug 27, 2015 at 02:33:07PM +0530, Vineet Gupta wrote:
> +pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
> +{
> +	struct list_head *lh;
> +	pgtable_t pgtable;
> +	pte_t *ptep;
> +
> +	assert_spin_locked(&mm->page_table_lock);
> +
> +	pgtable = pmd_huge_pte(mm, pmdp);
> +	lh = (struct list_head *) pgtable;
> +	if (list_empty(lh))
> +		pmd_huge_pte(mm, pmdp) = (pgtable_t) NULL;
> +	else {
> +		pmd_huge_pte(mm, pmdp) = (pgtable_t) lh->next;
> +		list_del(lh);
> +	}

Side question: why pgtable_t is unsigned long on ARC and not struct page *
or pte_t *, like on other archs? We could avoid these casts.

-- 
 Kirill A. Shutemov
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