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libnvdimm, pmem: adjust for section collisions with 'System RAM'

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On a platform where 'Persistent Memory' and 'System RAM' are mixed
within a given sparsemem section, trim the namespace and notify about the
sub-optimal alignment.

Cc: Toshi Kani <toshi.kani@hpe.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2016-03-03 09:38:00 -08:00
parent d9cbe09d39
commit cfe30b8720
4 changed files with 111 additions and 36 deletions
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5
drivers/nvdimm/pfn_devs.c
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@@ -299,6 +299,11 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn)
if (memcmp(pfn_sb->parent_uuid, parent_uuid, 16) != 0)
return -ENODEV;
if (__le16_to_cpu(pfn_sb->version_minor) < 1) {
pfn_sb->start_pad = 0;
pfn_sb->end_trunc = 0;
}
switch (le32_to_cpu(pfn_sb->mode)) {
case PFN_MODE_RAM:
case PFN_MODE_PMEM: