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-rw-r--r--include/uapi/linux/memfd.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/include/uapi/linux/memfd.h b/include/uapi/linux/memfd.h
index 534e364bda92..7f3a722dbd72 100644
--- a/include/uapi/linux/memfd.h
+++ b/include/uapi/linux/memfd.h
@@ -1,8 +1,32 @@
#ifndef _UAPI_LINUX_MEMFD_H
#define _UAPI_LINUX_MEMFD_H
+#include <asm-generic/hugetlb_encode.h>
+
/* flags for memfd_create(2) (unsigned int) */
#define MFD_CLOEXEC 0x0001U
#define MFD_ALLOW_SEALING 0x0002U
+#define MFD_HUGETLB 0x0004U
+
+/*
+ * Huge page size encoding when MFD_HUGETLB is specified, and a huge page
+ * size other than the default is desired. See hugetlb_encode.h.
+ * All known huge page size encodings are provided here. It is the
+ * responsibility of the application to know which sizes are supported on
+ * the running system. See mmap(2) man page for details.
+ */
+#define MFD_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT
+#define MFD_HUGE_MASK HUGETLB_FLAG_ENCODE_MASK
+
+#define MFD_HUGE_64KB HUGETLB_FLAG_ENCODE_64KB
+#define MFD_HUGE_512KB HUGETLB_FLAG_ENCODE_512KB
+#define MFD_HUGE_1MB HUGETLB_FLAG_ENCODE_1MB
+#define MFD_HUGE_2MB HUGETLB_FLAG_ENCODE_2MB
+#define MFD_HUGE_8MB HUGETLB_FLAG_ENCODE_8MB
+#define MFD_HUGE_16MB HUGETLB_FLAG_ENCODE_16MB
+#define MFD_HUGE_256MB HUGETLB_FLAG_ENCODE_256MB
+#define MFD_HUGE_1GB HUGETLB_FLAG_ENCODE_1GB
+#define MFD_HUGE_2GB HUGETLB_FLAG_ENCODE_2GB
+#define MFD_HUGE_16GB HUGETLB_FLAG_ENCODE_16GB
#endif /* _UAPI_LINUX_MEMFD_H */