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| author | Pavel Tatashin <pasha.tatashin@oracle.com> | 2018-05-11 16:01:50 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-16 10:10:27 +0200 |
| commit | 8ee7dabb311d6d723fc707a405bacec945a61a58 (patch) | |
| tree | 8cb76453c2f0f9376fe1d1cf82aefb3c7fe1c29f | |
| parent | 21fb6d8bc5044f1c118df5c5dc664851069f3fae (diff) | |
| download | linux-stable-8ee7dabb311d6d723fc707a405bacec945a61a58.tar.gz linux-stable-8ee7dabb311d6d723fc707a405bacec945a61a58.tar.bz2 linux-stable-8ee7dabb311d6d723fc707a405bacec945a61a58.zip | |
mm: sections are not offlined during memory hotremove
commit 27227c733852f71008e9bf165950bb2edaed3a90 upstream.
Memory hotplug and hotremove operate with per-block granularity. If the
machine has a large amount of memory (more than 64G), the size of a
memory block can span multiple sections. By mistake, during hotremove
we set only the first section to offline state.
The bug was discovered because kernel selftest started to fail:
https://lkml.kernel.org/r/20180423011247.GK5563@yexl-desktop
After commit, "mm/memory_hotplug: optimize probe routine". But, the bug
is older than this commit. In this optimization we also added a check
for sections to be in a proper state during hotplug operation.
Link: http://lkml.kernel.org/r/20180427145257.15222-1-pasha.tatashin@oracle.com
Fixes: 2d070eab2e82 ("mm: consider zone which is not fully populated to have holes")
Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Steven Sistare <steven.sistare@oracle.com>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | mm/sparse.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/sparse.c b/mm/sparse.c index 30e56a100ee8..76ed2f4a8a3e 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -661,7 +661,7 @@ void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn) unsigned long pfn; for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { - unsigned long section_nr = pfn_to_section_nr(start_pfn); + unsigned long section_nr = pfn_to_section_nr(pfn); struct mem_section *ms; /* |