Messages in this thread Patch in this message | | | From | Wei Yang <> | Subject | [PATCH 1/3] mm/sparsemem: adjust memmap only for SPARSEMEM_VMEMMAP | Date | Fri, 7 Feb 2020 07:16:27 +0800 |
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Only when SPARSEMEM_VMEMMAP is set, memmap returned from section_activate() points to sub-section page struct. Otherwise, memmap already points to the whole section page struct.
This means only for SPARSEMEM_VMEMMAP, we need to adjust memmap for sub-section case.
Fixes: ba72b4c8cf60 ("mm/sparsemem: support sub-section hotplug") Signed-off-by: Wei Yang <richardw.yang@linux.intel.com> CC: Dan Williams <dan.j.williams@intel.com> --- mm/sparse.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/sparse.c b/mm/sparse.c index 586d85662978..b5da121bdd6e 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -886,7 +886,8 @@ int __meminit sparse_add_section(int nid, unsigned long start_pfn, section_mark_present(ms); /* Align memmap to section boundary in the subsection case */ - if (section_nr_to_pfn(section_nr) != start_pfn) + if (IS_ENABLED(CONFIG_SPARSEMEM_VMEMMAP) && + section_nr_to_pfn(section_nr) != start_pfn) memmap = pfn_to_kaddr(section_nr_to_pfn(section_nr)); sparse_init_one_section(ms, section_nr, memmap, ms->usage, 0); -- 2.17.1
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