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| author | Dan Williams <dan.j.williams@intel.com> | 2021-02-26 02:17:08 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-02-26 18:41:00 +0100 |
| commit | 34dc45be4563f344d59ba0428416d0d265aa4f4d (patch) | |
| tree | cd4aad78ac82ff94569195a7509f336993f03f77 /security | |
| parent | mm: teach pfn_to_online_page() about ZONE_DEVICE section collisions (diff) | |
| download | linux-34dc45be4563f344d59ba0428416d0d265aa4f4d.tar.xz linux-34dc45be4563f344d59ba0428416d0d265aa4f4d.zip | |
mm: fix memory_failure() handling of dax-namespace metadata
Given 'struct dev_pagemap' spans both data pages and metadata pages be
careful to consult the altmap if present to delineate metadata. In fact
the pfn_first() helper already identifies the first valid data pfn, so
export that helper for other code paths via pgmap_pfn_valid().
Other usage of get_dev_pagemap() are not a concern because those are
operating on known data pfns having been looked up by get_user_pages().
I.e. metadata pfns are never user mapped.
Link: https://lkml.kernel.org/r/161058501758.1840162.4239831989762604527.stgit@dwillia2-desk3.amr.corp.intel.com
Fixes: 6100e34b2526 ("mm, memory_failure: Teach memory_failure() about dev_pagemap pages")
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reported-by: David Hildenbrand <david@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Qian Cai <cai@lca.pw>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security')
0 files changed, 0 insertions, 0 deletions