The patch titled
Subject: mm/sparsemem: get address to page struct instead of address to pfn
has been added to the -mm tree. Its filename is
mm-sparsemem-get-address-to-page-struct-instead-of-address-to-pfn.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-sparsemem-get-address-to-page-struct-instead-of-address-to-pfn.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-sparsemem-get-address-to-page-struct-instead-of-address-to-pfn.patch
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------------------------------------------------------
From: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
Subject: mm/sparsemem: get address to page struct instead of address to pfn
memmap should be the address to page struct instead of address to pfn.
As mentioned by David, if system memory and devmem sit within a section,
the mismatch address would lead kdump to dump unexpected memory.
Since sub-section only works for SPARSEMEM_VMEMMAP, pfn_to_page() is valid
to get the page struct address at this point.
Link: http://lkml.kernel.org/r/20200210005048.10437-1-richardw.yang@xxxxxxxxxxxxxxx
Fixes: ba72b4c8cf60 ("mm/sparsemem: support sub-section hotplug")
Signed-off-by: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/sparse.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/sparse.c~mm-sparsemem-get-address-to-page-struct-instead-of-address-to-pfn
+++ a/mm/sparse.c
@@ -884,7 +884,7 @@ int __meminit sparse_add_section(int nid
/* Align memmap to section boundary in the subsection case */
if (section_nr_to_pfn(section_nr) != start_pfn)
- memmap = pfn_to_kaddr(section_nr_to_pfn(section_nr));
+ memmap = pfn_to_page(section_nr_to_pfn(section_nr));
sparse_init_one_section(ms, section_nr, memmap, ms->usage, 0);
return 0;
_
Patches currently in -mm which might be from richardw.yang@xxxxxxxxxxxxxxx are
mm-sparsemem-get-address-to-page-struct-instead-of-address-to-pfn.patch
