The patch titled
Subject: fix-explanation-of-lower-bits-in-the-sparsemem-mem_map-pointer-v2
has been added to the -mm tree. Its filename is
fix-explanation-of-lower-bits-in-the-sparsemem-mem_map-pointer-v2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/fix-explanation-of-lower-bits-in-the-sparsemem-mem_map-pointer-v2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/fix-explanation-of-lower-bits-in-the-sparsemem-mem_map-pointer-v2.patch
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------------------------------------------------------
From: Petr Tesarik <ptesarik@xxxxxxxx>
Subject: fix-explanation-of-lower-bits-in-the-sparsemem-mem_map-pointer-v2
Link: http://lkml.kernel.org/r/20180125100516.589ea6af@xxxxxxxxxxxxxxx
Signed-off-by: Petr Tesarik <ptesarik@xxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Kemi Wang <kemi.wang@xxxxxxxxx>
Cc: YASUAKI ISHIMATSU <yasu.isimatu@xxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/sparse.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff -puN mm/sparse.c~fix-explanation-of-lower-bits-in-the-sparsemem-mem_map-pointer-v2 mm/sparse.c
--- a/mm/sparse.c~fix-explanation-of-lower-bits-in-the-sparsemem-mem_map-pointer-v2
+++ a/mm/sparse.c
@@ -264,7 +264,11 @@ unsigned long __init node_memmap_size_by
*/
static unsigned long sparse_encode_mem_map(struct page *mem_map, unsigned long pnum)
{
- return (unsigned long)(mem_map - (section_nr_to_pfn(pnum)));
+ unsigned long coded_mem_map =
+ (unsigned long)(mem_map - (section_nr_to_pfn(pnum)));
+ BUILD_BUG_ON(SECTION_MAP_LAST_BIT > (1UL<<PFN_SECTION_SHIFT));
+ BUG_ON(coded_mem_map & ~SECTION_MAP_MASK);
+ return coded_mem_map;
}
/*
_
Patches currently in -mm which might be from ptesarik@xxxxxxxx are
fix-explanation-of-lower-bits-in-the-sparsemem-mem_map-pointer.patch
fix-explanation-of-lower-bits-in-the-sparsemem-mem_map-pointer-v2.patch
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