libnvdimm/pfn: fix fsdax-mode namespace info-block zero-fields

[mirror_ubuntu-bionic-kernel.git] / drivers / nvdimm / pfn.h

diff --git a/drivers/nvdimm/pfn.h b/drivers/nvdimm/pfn.h
index dde9853453d3c622c42511772ff807bcf1fd70d0..e901e3a3b04c9920007609f64443a8895bb2dca4 100644 (file)
--- a/drivers/nvdimm/pfn.h
+++ b/drivers/nvdimm/pfn.h
@@ -36,6 +36,7 @@ struct nd_pfn_sb {
        __le32 end_trunc;
        /* minor-version-2 record the base alignment of the mapping */
        __le32 align;
+       /* minor-version-3 guarantee the padding and flags are zero */
        u8 padding[4000];
        __le64 checksum;
 };