From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f178.google.com (mail-pg1-f178.google.com [209.85.215.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6EA5F72 for ; Thu, 15 Jul 2021 00:18:07 +0000 (UTC) Received: by mail-pg1-f178.google.com with SMTP id s18so4237243pgq.3 for ; Wed, 14 Jul 2021 17:18:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=intel-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=4VJ3QvXXf1oCSZlmmZFCmW5HhP20GRBt05z5BXuB1vs=; b=uBduij+oYAOXEjH4jNqSZs7BixvrflL0IdUDoXUhFmhs1w/2WYw8ttEEGg0fN02eaK 7jsxrQM6OVx8FmZm481U3WqWwFAVAui13aUjeAE1kfy6CAYU+LuqJOhRzoywQ2m84iXS B1nfeX/Ke9hDOud+8boi/Ki8fNat1B4XK5KyHFB5BT4fXGBAaEMEttGMHdCBq+3X7Rty ziJScIfev0Y8vKOVwePgJfib2PwmVGnXtzcGHuRrxCcTChd/GC8pmKw5xJOw9d0JLeB9 KehMTZovWBH1NoSAnLm/xlmhl2DLXrMROI/NiJA33bK5WY9iZsdazO9f7mnP60FF15o/ VHrw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=4VJ3QvXXf1oCSZlmmZFCmW5HhP20GRBt05z5BXuB1vs=; b=ttYik+WHSKwxRaHt7hsJytFcjIkmUBb4VijPtp8bN/BeL9UraZ5RHNPfknpce0WhCb CaBAoPjCkiqxm71pltpCuRZPnh6ilIaMjfhzr4O8Sn47ywQN09aewEXdtgJeNKn/V7Jl rr0Chn5ORHbXBy6d+iqDwVHjbhpTAE6yRLgV7yxLjmyvYY1voOL0I81vU+QBBSdgHQvo yUu/G07W+deNjEpUw/qN909zAVJ4uAneYnsrgUeb066IXq3mxF7rspMa+smEflXyllUa 0JdrJ5GYRTGIMsF7+5ZoZGhXzdflhy9tz0dNSrDWYMCTgusv4RxHOmaAObBzKnOVtW7l LURg== X-Gm-Message-State: AOAM533xIhebuCsPoSJuSPGTJXe3ZnAfWQjhpRTyX9beSaILWxySeCvq sSA/93Eicx6SXc2hAXd6vitc9ho0+5pTlWy/lwc1oA== X-Google-Smtp-Source: ABdhPJyETQCPrQKAwXM3+Q+zFkI7GfSpzIc9Eemwwj5kBC+9lq+w0ZtFhIg9xVOKlT93NH9LOjq2bKHvYF+tqDg4OFk= X-Received: by 2002:a05:6a00:16c6:b029:32d:e190:9dd0 with SMTP id l6-20020a056a0016c6b029032de1909dd0mr811916pfc.70.1626308286912; Wed, 14 Jul 2021 17:18:06 -0700 (PDT) Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20210714193542.21857-1-joao.m.martins@oracle.com> <20210714193542.21857-2-joao.m.martins@oracle.com> In-Reply-To: <20210714193542.21857-2-joao.m.martins@oracle.com> From: Dan Williams Date: Wed, 14 Jul 2021 17:17:55 -0700 Message-ID: Subject: Re: [PATCH v3 01/14] memory-failure: fetch compound_head after pgmap_pfn_valid() To: Joao Martins Cc: Linux MM , Vishal Verma , Dave Jiang , Naoya Horiguchi , Matthew Wilcox , Jason Gunthorpe , John Hubbard , Jane Chu , Muchun Song , Mike Kravetz , Andrew Morton , Jonathan Corbet , Linux NVDIMM , Linux Doc Mailing List Content-Type: text/plain; charset="UTF-8" On Wed, Jul 14, 2021 at 12:36 PM Joao Martins wrote: > > memory_failure_dev_pagemap() at the moment assumes base pages (e.g. > dax_lock_page()). For pagemap with compound pages fetch the > compound_head in case a tail page memory failure is being handled. > > Currently this is a nop, but in the advent of compound pages in > dev_pagemap it allows memory_failure_dev_pagemap() to keep working. > > Reported-by: Jane Chu > Signed-off-by: Joao Martins > Reviewed-by: Naoya Horiguchi Reviewed-by: Dan Williams