mm: Allow architectures to define additional protection bits

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / mman.h

diff --git a/include/linux/mman.h b/include/linux/mman.h
index dab8892e6ff124817f7312b23e8055d3a50b2ce8..30d1073bac3ba63459123db829283fa9ec7eb8e5 100644 (file)
--- a/include/linux/mman.h
+++ b/include/linux/mman.h
@@ -33,6 +33,32 @@ static inline void vm_unacct_memory(long pages)
        vm_acct_memory(-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
@@ -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);
 }
 
 /*