1 files changed, 67 insertions, 0 deletions

diff --git a/include/linux/mman.h b/include/linux/mman.h
new file mode 100644
index 000000000000..18a5689ef748
--- /dev/null
+++ b/include/linux/mman.h
@@ -0,0 +1,67 @@
+#ifndef _LINUX_MMAN_H
+#define _LINUX_MMAN_H
+
+#include <linux/config.h>
+#include <linux/mm.h>
+
+#include <asm/atomic.h>
+#include <asm/mman.h>
+
+#define MREMAP_MAYMOVE  1
+#define MREMAP_FIXED    2
+
+#define OVERCOMMIT_GUESS                0
+#define OVERCOMMIT_ALWAYS               1
+#define OVERCOMMIT_NEVER                2
+extern int sysctl_overcommit_memory;
+extern int sysctl_overcommit_ratio;
+extern atomic_t vm_committed_space;
+
+#ifdef CONFIG_SMP
+extern void vm_acct_memory(long pages);
+#else
+static inline void vm_acct_memory(long pages)
+{
+        atomic_add(pages, &vm_committed_space);
+}
+#endif
+
+static inline void vm_unacct_memory(long pages)
+{
+        vm_acct_memory(-pages);
+}
+
+/*
+ * Optimisation macro.  It is equivalent to:
+ *      (x & bit1) ? bit2 : 0
+ * but this version is faster.
+ * ("bit1" and "bit2" must be single bits)
+ */
+#define _calc_vm_trans(x, bit1, bit2) \
+  ((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \
+   : ((x) & (bit1)) / ((bit1) / (bit2)))
+
+/*
+ * Combine the mmap "prot" argument into "vm_flags" used internally.
+ */
+static inline unsigned long
+calc_vm_prot_bits(unsigned long prot)
+{
+        return _calc_vm_trans(prot, PROT_READ,  VM_READ ) |
+               _calc_vm_trans(prot, PROT_WRITE, VM_WRITE) |
+               _calc_vm_trans(prot, PROT_EXEC,  VM_EXEC );
+}
+
+/*
+ * Combine the mmap "flags" argument into "vm_flags" used internally.
+ */
+static inline unsigned long
+calc_vm_flag_bits(unsigned long flags)
+{
+        return _calc_vm_trans(flags, MAP_GROWSDOWN,  VM_GROWSDOWN ) |
+               _calc_vm_trans(flags, MAP_DENYWRITE,  VM_DENYWRITE ) |
+               _calc_vm_trans(flags, MAP_EXECUTABLE, VM_EXECUTABLE) |
+               _calc_vm_trans(flags, MAP_LOCKED,     VM_LOCKED    );
+}
+
+#endif /* _LINUX_MMAN_H */