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(p200300cbc703aa00206415bd222d3a02.dip0.t-ipconnect.de. [2003:cb:c703:aa00:2064:15bd:222d:3a02]) by smtp.gmail.com with ESMTPSA id c4-20020a056000184400b00207a55f712asm3352085wri.37.2022.04.11.01.47.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 11 Apr 2022 01:47:35 -0700 (PDT) Message-ID: <1837b625-c63d-9feb-ec98-3b4c7b0040b4@redhat.com> Date: Mon, 11 Apr 2022 10:47:33 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.6.2 Subject: Re: [PATCHv4 1/8] mm: Add support for unaccepted memory To: "Kirill A. Shutemov" , Dave Hansen Cc: "Kirill A. Shutemov" , Borislav Petkov , Andy Lutomirski , Sean Christopherson , Andrew Morton , Joerg Roedel , Ard Biesheuvel , Andi Kleen , Kuppuswamy Sathyanarayanan , David Rientjes , Vlastimil Babka , Tom Lendacky , Thomas Gleixner , Peter Zijlstra , Paolo Bonzini , Ingo Molnar , Varad Gautam , Dario Faggioli , Brijesh Singh , Mike Rapoport , x86@kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, Mike Rapoport References: <20220405234343.74045-1-kirill.shutemov@linux.intel.com> <20220405234343.74045-2-kirill.shutemov@linux.intel.com> <767c2100-c171-1fd3-6a92-0af2e4bf3067@intel.com> <20220409155423.iv2arckmvavvpegt@box.shutemov.name> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20220409155423.iv2arckmvavvpegt@box.shutemov.name> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 8DB3C20003 X-Stat-Signature: iifcirytcdzf8iop5dgby9seryzpxebs X-Rspam-User: Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=BIZpIVkd; dmarc=pass (policy=none) header.from=redhat.com; spf=none (imf13.hostedemail.com: domain of david@redhat.com has no SPF policy when checking 170.10.133.124) smtp.mailfrom=david@redhat.com X-HE-Tag: 1649666861-91344 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: >>> if (fpi_flags & FPI_TO_TAIL) >>> to_tail = true; >>> else if (is_shuffle_order(order)) >>> @@ -1149,7 +1192,8 @@ static inline void __free_one_page(struct page *page, >>> static inline bool page_expected_state(struct page *page, >>> unsigned long check_flags) >>> { >>> - if (unlikely(atomic_read(&page->_mapcount) != -1)) >>> + if (unlikely(atomic_read(&page->_mapcount) != -1) && >>> + !PageUnaccepted(page)) >>> return false; >> >> That probably deserves a comment, and maybe its own if() statement. > > Own if does not work. PageUnaccepted() is encoded in _mapcount. > > What about this: > > /* > * page->_mapcount is expected to be -1. > * > * There is an exception for PageUnaccepted(). The page type can be set > * for pages on free list. Page types are encoded in _mapcount. > * > * PageUnaccepted() will get cleared in post_alloc_hook(). > */ > if (unlikely((atomic_read(&page->_mapcount) | PG_unaccepted) != -1)) > return false; > > ? > Please don't. Keep the usage of PG_* details inside page-flags.h -- Thanks, David / dhildenb