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From: Joao Martins <joao.m.martins@oracle.com>
To: linux-mm@kvack.org
Cc: Dan Williams <dan.j.williams@intel.com>,
	Vishal Verma <vishal.l.verma@intel.com>,
	Dave Jiang <dave.jiang@intel.com>,
	Naoya Horiguchi <naoya.horiguchi@nec.com>,
	Matthew Wilcox <willy@infradead.org>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	John Hubbard <jhubbard@nvidia.com>,
	Jane Chu <jane.chu@oracle.com>,
	Muchun Song <songmuchun@bytedance.com>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Jonathan Corbet <corbet@lwn.net>,
	nvdimm@lists.linux.dev, linux-doc@vger.kernel.org,
	Joao Martins <joao.m.martins@oracle.com>
Subject: [PATCH v2 01/14] memory-failure: fetch compound_head after pgmap_pfn_valid()
Date: Thu, 17 Jun 2021 19:44:54 +0100	[thread overview]
Message-ID: <20210617184507.3662-2-joao.m.martins@oracle.com> (raw)
In-Reply-To: <20210617184507.3662-1-joao.m.martins@oracle.com>

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 <jane.chu@oracle.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
---
 mm/memory-failure.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index e684b3d5c6a6..f1be578e488f 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1519,6 +1519,12 @@ static int memory_failure_dev_pagemap(unsigned long pfn, int flags,
 		goto out;
 	}
 
+	/*
+	 * Pages instantiated by device-dax (not filesystem-dax)
+	 * may be compound pages.
+	 */
+	page = compound_head(page);
+
 	/*
 	 * Prevent the inode from being freed while we are interrogating
 	 * the address_space, typically this would be handled by
-- 
2.17.1


  reply	other threads:[~2021-06-17 18:46 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-17 18:44 [PATCH v2 00/14] mm, sparse-vmemmap: Introduce compound pagemaps Joao Martins
2021-06-17 18:44 ` Joao Martins [this message]
2021-06-20 23:56   ` [PATCH v2 01/14] memory-failure: fetch compound_head after pgmap_pfn_valid() HORIGUCHI NAOYA(堀口 直也)
2021-06-21 13:50     ` Joao Martins
2021-06-17 18:44 ` [PATCH v2 02/14] mm/page_alloc: split prep_compound_page into head and tail subparts Joao Martins
2021-07-13  0:02   ` Mike Kravetz
2021-07-13  1:11     ` Joao Martins
2021-06-17 18:44 ` [PATCH v2 03/14] mm/page_alloc: refactor memmap_init_zone_device() page init Joao Martins
2021-06-17 18:44 ` [PATCH v2 04/14] mm/memremap: add ZONE_DEVICE support for compound pages Joao Martins
2021-06-17 18:44 ` [PATCH v2 05/14] mm/sparse-vmemmap: add a pgmap argument to section activation Joao Martins
2021-06-17 18:44 ` [PATCH v2 06/14] mm/sparse-vmemmap: refactor core of vmemmap_populate_basepages() to helper Joao Martins
2021-06-17 18:45 ` [PATCH v2 07/14] mm/hugetlb_vmemmap: move comment block to Documentation/vm Joao Martins
2021-06-21 13:12   ` [External] " Muchun Song
2021-06-21 13:42     ` Joao Martins
2021-07-13  0:14       ` Mike Kravetz
2021-07-13  1:11         ` Joao Martins
2021-06-17 18:45 ` [PATCH v2 08/14] mm/sparse-vmemmap: populate compound pagemaps Joao Martins
2021-06-17 18:45 ` [PATCH v2 09/14] mm/page_alloc: reuse tail struct pages for " Joao Martins
2021-06-17 18:45 ` [PATCH v2 10/14] device-dax: use ALIGN() for determining pgoff Joao Martins
2021-06-17 18:45 ` [PATCH v2 11/14] device-dax: ensure dev_dax->pgmap is valid for dynamic devices Joao Martins
2021-06-17 18:45 ` [PATCH v2 12/14] device-dax: compound pagemap support Joao Martins
2021-06-17 18:45 ` [PATCH v2 13/14] mm/gup: grab head page refcount once for group of subpages Joao Martins
2021-06-17 18:45 ` [PATCH v2 14/14] mm/sparse-vmemmap: improve memory savings for compound pud geometry Joao Martins

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