The patch titled
Subject: mm/pgmap: use correct alignment when looking at first pfn from a region
has been removed from the -mm tree. Its filename was
mm-pgmap-use-correct-alignment-when-looking-at-first-pfn-from-a-region.patch
This patch was dropped because lack of interest
------------------------------------------------------
From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxx>
Subject: mm/pgmap: use correct alignment when looking at first pfn from a region
vmem_altmap_offset() adjusts the section aligned base_pfn offset. So we
need to make sure we account for the same when computing base_pfn.
ie, for altmap_valid case, our pfn_first should be:
pfn_first = altmap->base_pfn + vmem_altmap_offset(altmap);
This was found by code inspection. If the pmem region is not correctly
section aligned we can skip pfns while iterating device pfn using
for_each_device_pfn(pfn, pgmap)
[akpm@xxxxxxxxxxxxxxxxxxxx: coding style fixes]
Link: http://lkml.kernel.org/r/20190917153129.12905-1-aneesh.kumar@xxxxxxxxxxxxx
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Ralph Campbell <rcampbell@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memremap.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
--- a/mm/memremap.c~mm-pgmap-use-correct-alignment-when-looking-at-first-pfn-from-a-region
+++ a/mm/memremap.c
@@ -56,8 +56,16 @@ static void pgmap_array_delete(struct re
static unsigned long pfn_first(struct dev_pagemap *pgmap)
{
- return PHYS_PFN(pgmap->res.start) +
- vmem_altmap_offset(pgmap_altmap(pgmap));
+ const struct resource *res = &pgmap->res;
+ struct vmem_altmap *altmap = pgmap_altmap(pgmap);
+ unsigned long pfn;
+
+ if (altmap)
+ pfn = altmap->base_pfn + vmem_altmap_offset(altmap);
+ else
+ pfn = PHYS_PFN(res->start);
+
+ return pfn;
}
static unsigned long pfn_end(struct dev_pagemap *pgmap)
_
Patches currently in -mm which might be from aneesh.kumar@xxxxxxxxxxxxx are
mm-memmap_init-update-variable-name-in-memmap_init_zone.patch
