linux-kernel - Re: [PATCH v12 5/6] khugepaged: enable collapse pmd for pte-mapped THP

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Message-ID: <20190812121144.f46abvpg6lvxwwzs@box>
Date:   Mon, 12 Aug 2019 15:11:44 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Song Liu <songliubraving@...com>
Cc:     Oleg Nesterov <oleg@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <matthew.wilcox@...cle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Kernel Team <Kernel-team@...com>,
        William Kucharski <william.kucharski@...cle.com>,
        "srikar@...ux.vnet.ibm.com" <srikar@...ux.vnet.ibm.com>
Subject: Re: [PATCH v12 5/6] khugepaged: enable collapse pmd for pte-mapped
 THP

On Fri, Aug 09, 2019 at 06:01:18PM +0000, Song Liu wrote:
> +		if (pte_none(*pte) || !pte_present(*pte))
> +			continue;

You don't need to check both. Present is never none.

-- 
 Kirill A. Shutemov