The patch titled
Subject: mm/page_alloc: fix and rework pfn handling in memmap_init_zone()
has been added to the -mm tree. Its filename is
mm-page_alloc-fix-and-rework-pfn-handling-in-memmap_init_zone.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_alloc-fix-and-rework-pfn-handling-in-memmap_init_zone.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_alloc-fix-and-rework-pfn-handling-in-memmap_init_zone.patch
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------------------------------------------------------
From: David Hildenbrand <david@xxxxxxxxxx>
Subject: mm/page_alloc: fix and rework pfn handling in memmap_init_zone()
Let's update the pfn manually whenever we continue the loop. This makes
the code easier to read but also less error prone (and we can directly fix
one issue).
When overlap_memmap_init() returns true, pfn is updated to
"memblock_region_memory_end_pfn(r)". So it already points at the *next*
pfn to process. Incrementing the pfn another time is wrong, we might
leave one uninitialized. I spotted this by inspecting the code, so I have
no idea if this is relevant in practise (with kernelcore=3Dmirror).
Link: http://lkml.kernel.org/r/20200113144035.10848-2-david@xxxxxxxxxx
Fixes: a9a9e77fbf27 ("mm: move mirrored memory specific code outside of m=
emmap_init_zone")
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: "Jin, Zhi" <zhi.jin@xxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
--- a/mm/page_alloc.c~mm-page_alloc-fix-and-rework-pfn-handling-in-memmap_init_zone
+++ a/mm/page_alloc.c
@@ -5905,18 +5905,20 @@ void __meminit memmap_init_zone(unsigned
}
#endif
- for (pfn = start_pfn; pfn < end_pfn; pfn++) {
+ for (pfn = start_pfn; pfn < end_pfn; ) {
/*
* There can be holes in boot-time mem_map[]s handed to this
* function. They do not exist on hotplugged memory.
*/
if (context == MEMMAP_EARLY) {
if (!early_pfn_valid(pfn)) {
- pfn = next_pfn(pfn) - 1;
+ pfn = next_pfn(pfn);
continue;
}
- if (!early_pfn_in_nid(pfn, nid))
+ if (!early_pfn_in_nid(pfn, nid)) {
+ pfn++;
continue;
+ }
if (overlap_memmap_init(zone, &pfn))
continue;
if (defer_init(nid, pfn, end_pfn))
@@ -5944,6 +5946,7 @@ void __meminit memmap_init_zone(unsigned
set_pageblock_migratetype(page, MIGRATE_MOVABLE);
cond_resched();
}
+ pfn++;
}
}
_
Patches currently in -mm which might be from david@xxxxxxxxxx are
mm-fix-uninitialized-memmaps-on-a-partially-populated-last-section.patch
fs-proc-pagec-allow-inspection-of-last-section-and-fix-end-detection.patch
mm-initialize-memmap-of-unavailable-memory-directly.patch
mm-memory_hotplug-dont-free-usage-map-when-removing-a-re-added-early-section.patch
drivers-base-memoryc-cache-blocks-in-radix-tree-to-accelerate-lookup-fix-2.patch
mm-memory_hotplug-poison-memmap-in-remove_pfn_range_from_zone.patch
mm-memory_hotplug-we-always-have-a-zone-in-find_smallestbiggest_section_pfn.patch
mm-memory_hotplug-dont-check-for-all-holes-in-shrink_zone_span.patch
mm-memory_hotplug-drop-local-variables-in-shrink_zone_span.patch
mm-memory_hotplug-cleanup-__remove_pages.patch
mm-memory_hotplug-drop-valid_start-valid_end-from-test_pages_in_a_zone.patch
mm-page_alloc-fix-and-rework-pfn-handling-in-memmap_init_zone.patch
mm-factor-out-next_present_section_nr.patch
