From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: dan.j.williams@intel.com
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
linux-nvdimm@lists.01.org
Subject: [PATCH v5] mm/nvdimm: Use correct alignment when looking at first pfn from a region
Date: Fri, 9 Aug 2019 13:18:08 +0530 [thread overview]
Message-ID: <20190809074808.28063-1-aneesh.kumar@linux.ibm.com> (raw)
vmem_altmap_offset() adjust 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);
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
Changes from v4:
* rebase to latest kernel
mm/memremap.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/mm/memremap.c b/mm/memremap.c
index 6ee03a816d67..6b8cd10e5e35 100644
--- a/mm/memremap.c
+++ b/mm/memremap.c
@@ -54,8 +54,16 @@ static void pgmap_array_delete(struct resource *res)
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)
--
2.21.0
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