From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D383BC48BCF for ; Wed, 9 Jun 2021 10:27:39 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3B89E61359 for ; Wed, 9 Jun 2021 10:27:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3B89E61359 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=shutemov.name Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id B489A6B0036; Wed, 9 Jun 2021 06:27:38 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id AF8736B006E; Wed, 9 Jun 2021 06:27:38 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 971F26B0070; Wed, 9 Jun 2021 06:27:38 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0090.hostedemail.com [216.40.44.90]) by kanga.kvack.org (Postfix) with ESMTP id 659A66B0036 for ; Wed, 9 Jun 2021 06:27:38 -0400 (EDT) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 04CFCB9E9 for ; Wed, 9 Jun 2021 10:27:38 +0000 (UTC) X-FDA: 78233808996.17.3DF7016 Received: from mail-lf1-f51.google.com (mail-lf1-f51.google.com [209.85.167.51]) by imf11.hostedemail.com (Postfix) with ESMTP id 4F7C4200106B for ; Wed, 9 Jun 2021 10:27:33 +0000 (UTC) Received: by mail-lf1-f51.google.com with SMTP id a1so27464706lfr.12 for ; Wed, 09 Jun 2021 03:27:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shutemov-name.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=7nPZCXLPijOT5fF+FbZxX7XklvUO6QeqH4yp5xzaFwE=; b=Gf01+i+rhrmHv9uNBDWDc4o/KNuydo5p1MgGdFh07Uoo+QVHZHlt6MLTMN/DbW7mCN a6vTFWPnMtsCf4wTlZA2u3Gb8Xz+5GHAmSFv+9eLD2WDtbE71s7If/Uqqdzr8VNKy1SX A0wsmHGiKewJw7KfcC20flRS3LszPAHip5ia4RJ7Za6GCxzOqTJO4BzKoThXHiCjfEUR kRmpXjGugz/IpC3P1hv06est6m8bAPWn0hRaPEe0VCXpRVR6HzsH8Cv/vW8EhCRxt4Gi sUdzYSad+GLPzNIZeBblLs0VftgEtBokyA+gFODBNZBOmmprVk9BeQvgD/eXURL1FZ0p b0PQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=7nPZCXLPijOT5fF+FbZxX7XklvUO6QeqH4yp5xzaFwE=; b=HugAeI9f4GSrMkUpX6KdXxEhyi1dYaCGOb2j8saAZREnatdn5K9lCotFWVMiTUDp2j G/WM3qGDxbwLD/8Ac4O6JF78sNJda56/hnsXGIUBAr/2QXucN6RxzqTyR/I5EgH89yLn PHVYSMQHkT6yHhAwIc9oFrafOGFpcpYI+48cXkev6zN/UV2F1dnT6d8Nx3AyoQU0bzUT eo8xdLqtokk9RpSNFdWbvMAQE+jRaUYgsW+Sz1XmHPiGgfkNon3PpEjXZEKRtB9Log17 Zxzr9RWx8uGzrQx/o9FRKThv0Mkvvb8bAafcsT/q3UAnTYrSKul3IVUohYcCJWiLnqz8 pmlw== X-Gm-Message-State: AOAM532Qh1cOSnUJ9PUwejWnN0h3Ny2O8pbP0+m6moDL41ddgzp2I0b+ qzoYcIHGkhMkJR7udiLrSCW8vg== X-Google-Smtp-Source: ABdhPJwjfxmKWEB3+rmH59gf3PO/sBFiAJZlK0/2MqOWJs+l0Ao8B7SWqlQ+PgaSFfHF90dKNoc7hg== X-Received: by 2002:a05:6512:38ce:: with SMTP id p14mr19133331lft.197.1623234456361; Wed, 09 Jun 2021 03:27:36 -0700 (PDT) Received: from box.localdomain ([86.57.175.117]) by smtp.gmail.com with ESMTPSA id y22sm308374lfh.154.2021.06.09.03.27.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Jun 2021 03:27:35 -0700 (PDT) Received: by box.localdomain (Postfix, from userid 1000) id 3AE1A10265B; Wed, 9 Jun 2021 13:27:51 +0300 (+03) Date: Wed, 9 Jun 2021 13:27:51 +0300 From: "Kirill A. Shutemov" To: Hugh Dickins Cc: Andrew Morton , "Kirill A. Shutemov" , Yang Shi , Wang Yugui , Matthew Wilcox , Naoya Horiguchi , Alistair Popple , Ralph Campbell , Zi Yan , Miaohe Lin , Minchan Kim , Jue Wang , Peter Xu , Jan Kara , Shakeel Butt , Oscar Salvador , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 10/10] mm: hwpoison_user_mappings() try_to_unmap() with TTU_SYNC Message-ID: <20210609102751.kl4ywrx3bybyg46w@box.shutemov.name> References: <329c28ed-95df-9a2c-8893-b444d8a6d340@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <329c28ed-95df-9a2c-8893-b444d8a6d340@google.com> X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 4F7C4200106B Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=shutemov-name.20150623.gappssmtp.com header.s=20150623 header.b=Gf01+i+r; spf=none (imf11.hostedemail.com: domain of kirill@shutemov.name has no SPF policy when checking 209.85.167.51) smtp.mailfrom=kirill@shutemov.name; dmarc=none X-Stat-Signature: tpmgcy4acnkdar99uwffd7etwzd3i4fi X-HE-Tag: 1623234453-697353 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Jun 08, 2021 at 09:30:00PM -0700, Hugh Dickins wrote: > TTU_SYNC prevents an unlikely race, when try_to_unmap() returns shortly > before the page is accounted as unmapped. It is unlikely to coincide > with hwpoisoning, but now that we have the flag, hwpoison_user_mappings() > would do well to use it. > > Signed-off-by: Hugh Dickins Acked-by: Kirill A. Shutemov -- Kirill A. Shutemov