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| author |   Dan Williams <dan.j.williams@intel.com> | 2021-02-25 17:17:01 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2021-02-26 09:41:00 -0800 |
| commit | 9f9b02e5b3468e665a576a86ceb72f753001710b (patch) | |
| tree | 5e5ea6a3732a2680f8afecae4208d55ff4e1df4e /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | mm: move pfn_to_online_page() out of line (diff) | |
| download | linux-dev-9f9b02e5b3468e665a576a86ceb72f753001710b.tar.xz linux-dev-9f9b02e5b3468e665a576a86ceb72f753001710b.zip | |
mm: teach pfn_to_online_page() to consider subsection validity
pfn_to_online_page is primarily used to filter out offline or fully
uninitialized pages. pfn_valid resp. online_section_nr have a coarse
per memory section granularity. If a section shared with a partially
offline memory (e.g. part of ZONE_DEVICE) then pfn_to_online_page
would lead to a false positive on some pfns. Fix this by adding
pfn_section_valid check which is subsection aware.
[mhocko@kernel.org: changelog rewrite]
Link: https://lkml.kernel.org/r/161058500148.1840162.4365921007820501696.stgit@dwillia2-desk3.amr.corp.intel.com
Fixes: b13bc35193d9 ("mm/hotplug: invalid PFNs from pfn_to_online_page()")
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: Oscar Salvador <osalvador@suse.de>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Qian Cai <cai@lca.pw>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions