From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f179.google.com (mail-pf1-f179.google.com [209.85.210.179]) (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 E5A7070 for ; Thu, 15 Jul 2021 02:52:23 +0000 (UTC) Received: by mail-pf1-f179.google.com with SMTP id 21so3776841pfp.3 for ; Wed, 14 Jul 2021 19:52:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=dMC/7BJES1xsl6whxIikhxzC8Rq8hRd9OZiivLLNk5o=; b=wVWv2guCZsRL63EFpcEV44cSTV9blEjTw/yo7hgyxR635O9UVREcpt+T3FzX4Lluqs 9G7kDyCSSVj6iBRtHARWGMcpRXOO67gArpetvAoVUDNAwCc0X7fXV/FYFNk4h2qV6m8h Rl77vuZNfyFgqZ8+NucSgYQRhhsvVOOEHMixZRwsdM2gXDbNSHflX4NZ/evElDfxPTNw fQ/F/dwxnC+KU78EI5foaEWwwjSVMVXQhY2wGXsHoRBXVzLDNF6D6ta0tA9L7rmp9Y7V Mv2ayi8gIdpa3QNo3O+RZQMXpnyoYp5hXOYtXJ2V1VmTDMLNEl9V6AigG8qFVNbmsenW WOlw== 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=dMC/7BJES1xsl6whxIikhxzC8Rq8hRd9OZiivLLNk5o=; b=UW+D92kNXAiG9CsyLZS7xyKV5suu6cZC38/aFjKx+wx+pbJfWT4bvJlTbm/C1llA2C K8ENy/3PUl+dd+n8s7Gdlxx9ywPvuljF0+UePjMNWWNgS8txX6yuGaJq7h+UyLU3eZL8 7TKbir+AN4g7MJHabeFQRBjfMhAN1ah8MlDbS0umz8AeawP8rrczLxynxWSS3S58iC41 ZxZVH6fRQiL21PRuHCDgG1VZeFBc7v2ULQ7NwaAs2EU+u4mSPm7Z0yPX0q6HCGvHhOm2 hfEelqJ1f8DdsUJjrdyEhdOA8KG7gGRIi6tO5BXU7LLlemHldWwmqzq4po8ROiLoQ6Mo 2gaw== X-Gm-Message-State: AOAM533Px4n2EwyHPTS1I7Dhfc/KYLAC+Chu3Vozni+VPphs+HeanbJh 9gvKJ6QVgiloAnuaj27ln26pX6DTDBJnNVcYQD5/Tw== X-Google-Smtp-Source: ABdhPJyCEpo9gLI9Iqz6IRgl/n5sGdxftzB8/eWvGjFyB3LPYbqUeTR0VczLI0dVPoOPiyANWeNQTYTcnqJBBlaPbr4= X-Received: by 2002:a63:5963:: with SMTP id j35mr1588664pgm.341.1626317543330; Wed, 14 Jul 2021 19:52:23 -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: Muchun Song Date: Thu, 15 Jul 2021 10:51:47 +0800 Message-ID: Subject: Re: [External] [PATCH v3 01/14] memory-failure: fetch compound_head after pgmap_pfn_valid() To: Joao Martins Cc: Linux Memory Management List , Dan Williams , Vishal Verma , Dave Jiang , Naoya Horiguchi , Matthew Wilcox , Jason Gunthorpe , John Hubbard , Jane Chu , Mike Kravetz , Andrew Morton , Jonathan Corbet , nvdimm@lists.linux.dev, linux-doc@vger.kernel.org Content-Type: text/plain; charset="UTF-8" On Thu, Jul 15, 2021 at 3:36 AM 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: Muchun Song