mm/shmem: add hugetlbfs support to memfd_create()

[sfrench/cifs-2.6.git] / include / uapi / linux / memfd.h

diff --git a/include/uapi/linux/memfd.h b/include/uapi/linux/memfd.h
index 534e364bda92b05a3067234f8b9d285c06bebbd9..7f3a722dbd722b8c515d3dd9176ce1d646a0caac 100644 (file)
--- 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 */