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Shutemov" To: Song Liu Cc: Oleg Nesterov , Linux Kernel Mailing List , Linux MM , Andrew Morton , Matthew Wilcox , "Kirill A. Shutemov" , Kernel Team , William Kucharski , "srikar@linux.vnet.ibm.com" Subject: Re: [PATCH v12 5/6] khugepaged: enable collapse pmd for pte-mapped THP Message-ID: <20190812121144.f46abvpg6lvxwwzs@box> References: <20190807233729.3899352-1-songliubraving@fb.com> <20190807233729.3899352-6-songliubraving@fb.com> <20190808163303.GB7934@redhat.com> <770B3C29-CE8F-4228-8992-3C6E2B5487B6@fb.com> <20190809152404.GA21489@redhat.com> <3B09235E-5CF7-4982-B8E6-114C52196BE5@fb.com> <4D8B8397-5107-456B-91FC-4911F255AE11@fb.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4D8B8397-5107-456B-91FC-4911F255AE11@fb.com> User-Agent: NeoMutt/20180716 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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