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Wed, 14 Jul 2021 19:52:23 -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: 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" Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=bytedance-com.20150623.gappssmtp.com header.s=20150623 header.b=wVWv2guC; spf=pass (imf26.hostedemail.com: domain of songmuchun@bytedance.com designates 209.85.215.174 as permitted sender) smtp.mailfrom=songmuchun@bytedance.com; dmarc=pass (policy=none) header.from=bytedance.com X-Rspamd-Server: rspam02 X-Stat-Signature: 3y1bszpki79tjcpmwprycrpobx63qamh X-Rspamd-Queue-Id: 6192620019EB X-HE-Tag: 1626317544-299332 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 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