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

[thirdparty/kernel/stable.git] / drivers / nvdimm / pfn.h

diff --git a/drivers/nvdimm/pfn.h b/drivers/nvdimm/pfn.h
index f58b849e455b1ad0bee4f08c8459049644aeab51..dfb2bcda8f5a43e570538373923684d4f7cd761a 100644 (file)
--- a/drivers/nvdimm/pfn.h
+++ b/drivers/nvdimm/pfn.h
@@ -28,6 +28,7 @@ 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;
 };