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Subject[PATCH 4.13 17/27] mm/sparse.c: fix typo in online_mem_sections
4.13-stable review patch.  If anyone has any objections, please let me know.


From: Michal Hocko <>

commit b4ccec41af82b5a5518c6534444412961894f07c upstream.

online_mem_sections() accidentally marks online only the first section
in the given range. This is a typo which hasn't been noticed because I
haven't tested large 2GB blocks previously. All users of
pfn_to_online_page would get confused on the the rest of the pfn range
in the block.

All we need to fix this is to use iterator (pfn) rather than start_pfn.

Fixes: 2d070eab2e82 ("mm: consider zone which is not fully populated to have holes")
Signed-off-by: Michal Hocko <>
Acked-by: Vlastimil Babka <>
Cc: Anshuman Khandual <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
Signed-off-by: Greg Kroah-Hartman <>

mm/sparse.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -630,7 +630,7 @@ void online_mem_sections(unsigned long s
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;

/* onlining code should never touch invalid ranges */

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