From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B42D710EB for ; Mon, 11 Apr 2022 08:47:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1649666858; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=xO5/uXu6trmQnelozguxiW34fXYut6Mlb4fdD2t6SEU=; b=EMfGSGoEPUa57MHJNNJL/lS2d/NUBXqM8TtRYzwA8NeUSSeIPotQmq/epZDYUrUvXHdj0k ruUICm5dt5XkOrofTRT6MJtXsZ1SsT6vEPCcYnOL0K3HIOLiuBu9y29ZUO0By14vtp+Bqv 0E+BVEByp95EPWkJiHByXVSV7xAdUTE= Received: from mail-wr1-f72.google.com (mail-wr1-f72.google.com [209.85.221.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-633-eunntkDBM8G4E1Oz5eDgOQ-1; Mon, 11 Apr 2022 04:47:37 -0400 X-MC-Unique: eunntkDBM8G4E1Oz5eDgOQ-1 Received: by mail-wr1-f72.google.com with SMTP id f9-20020adf9f49000000b00207a6d8b67cso509956wrg.8 for ; Mon, 11 Apr 2022 01:47:37 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:organization:in-reply-to :content-transfer-encoding; bh=xO5/uXu6trmQnelozguxiW34fXYut6Mlb4fdD2t6SEU=; b=XnSSnOytYFKXZY30H75fXQABElqRW6u0V2IDQhYB3JMRZDJetKFJ0xbmPwb83WaxV0 oMQFaGC4zW9vW36NmXlxKB0hwAfrlyPyHbgxSvkJU4znPGbIVMK8+kHIxLjwComVbK8a ArISCDqQevnHw/zATcEsNQf/CODsDeX+4kInO01jnwsJaCuqXIxuElXSNQi+A1FupMUW E4dnVMeNvXnY+D+Q5ZsSqHRn1UhQdYfskmFDcqtAkx+pQ/vZvHl1kvhQ6zzTJop+Lo8f Al+ZlJub1ne+fEaii0miILLxGnZtpzh2icZ+BXt79JldAOk9JyEF4JTe71sOnU5/Q7QH MWug== X-Gm-Message-State: AOAM531wdyGCHl6MjPOwMuS8FIw1wNlUUpqcMTmyZL8j7Y89VuNW8lMj c1PGG2UlB8IEHN77PH0TIZUDLH7AWAC3e0riJLFWaIupxdzmX8QpD3Ei2fQcsS0iC7RIcCFsVVP OYAC8tBp7gL+KLjQWzXC80w== X-Received: by 2002:adf:db86:0:b0:205:bccf:8cbf with SMTP id u6-20020adfdb86000000b00205bccf8cbfmr23524566wri.346.1649666856072; Mon, 11 Apr 2022 01:47:36 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwU4i8tDZK4R8SDfWHRx/HMVMKbJaFD0rR9CAx62zvu90I37i9CuXip3i2xbgqxkZ/aEv7AAg== X-Received: by 2002:adf:db86:0:b0:205:bccf:8cbf with SMTP id u6-20020adfdb86000000b00205bccf8cbfmr23524547wri.346.1649666855817; Mon, 11 Apr 2022 01:47:35 -0700 (PDT) Received: from ?IPV6:2003:cb:c703:aa00:2064:15bd:222d:3a02? (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 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: 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> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david@redhat.com 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 >>> 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