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Wed, 14 Jul 2021 17:18:06 -0700 (PDT) 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" Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=intel-com.20150623.gappssmtp.com header.s=20150623 header.b=uBduij+o; spf=none (imf02.hostedemail.com: domain of dan.j.williams@intel.com has no SPF policy when checking 209.85.215.178) smtp.mailfrom=dan.j.williams@intel.com; dmarc=fail reason="No valid SPF, DKIM not aligned (relaxed)" header.from=intel.com (policy=none) X-Rspamd-Server: rspam02 X-Stat-Signature: nn6tosjj5k96f7oubbk7q63dniqh34kq X-Rspamd-Queue-Id: E36BC7001A05 X-HE-Tag: 1626308287-41009 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: 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