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[v1,01/11] memory-failure: fetch compound_head after pgmap_pfn_valid()

Message ID 20210325230938.30752-2-joao.m.martins@oracle.com (mailing list archive)
State New
Headers show
Series mm, sparse-vmemmap: Introduce compound pagemaps | expand

Commit Message

Joao Martins March 25, 2021, 11:09 p.m. UTC
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 we are handling a tail page memory failure.

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 | 2 ++
 1 file changed, 2 insertions(+)
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diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 24210c9bd843..94240d772623 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1318,6 +1318,8 @@  static int memory_failure_dev_pagemap(unsigned long pfn, int flags,
 		goto out;
+	page = compound_head(page);
 	 * Prevent the inode from being freed while we are interrogating
 	 * the address_space, typically this would be handled by