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-rw-r--r--arch/alpha/include/asm/mman.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/mman.h b/arch/alpha/include/asm/mman.h
index cbeb3616a28e..0086b472bc2b 100644
--- a/arch/alpha/include/asm/mman.h
+++ b/arch/alpha/include/asm/mman.h
@@ -63,4 +63,15 @@
/* compatibility flags */
#define MAP_FILE 0
+/*
+ * When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size.
+ * This gives us 6 bits, which is enough until someone invents 128 bit address
+ * spaces.
+ *
+ * Assume these are all power of twos.
+ * When 0 use the default page size.
+ */
+#define MAP_HUGE_SHIFT 26
+#define MAP_HUGE_MASK 0x3f
+
#endif /* __ALPHA_MMAN_H__ */