1 files changed, 28 insertions, 1 deletions

diff --git a/include/linux/mman.h b/include/linux/mman.h
index dab8892e6ff1..30d1073bac3b 100644
--- a/include/linux/mman.h
+++ b/include/linux/mman.h
@@ -34,6 +34,32 @@ static inline void vm_unacct_memory(long pages)
 }
 
 /*
+ * Allow architectures to handle additional protection bits
+ */
+
+#ifndef arch_calc_vm_prot_bits
+#define arch_calc_vm_prot_bits(prot) 0
+#endif
+
+#ifndef arch_vm_get_page_prot
+#define arch_vm_get_page_prot(vm_flags) __pgprot(0)
+#endif
+
+#ifndef arch_validate_prot
+/*
+ * This is called from mprotect().  PROT_GROWSDOWN and PROT_GROWSUP have
+ * already been masked out.
+ *
+ * Returns true if the prot flags are valid
+ */
+static inline int arch_validate_prot(unsigned long prot)
+{
+        return (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM)) == 0;
+}
+#define arch_validate_prot arch_validate_prot
+#endif
+
+/*
  * Optimisation macro.  It is equivalent to:
  *      (x & bit1) ? bit2 : 0
  * but this version is faster.
@@ -51,7 +77,8 @@ 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 );
+               _calc_vm_trans(prot, PROT_EXEC,  VM_EXEC) |
+               arch_calc_vm_prot_bits(prot);
 }
 
 /*