mm: define default value for FIRST_USER_ADDRESS

[linux-2.6-microblaze.git] / include / linux / pgtable.h

diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 2b0d022..69700e3 100644 (file)
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -28,6 +28,15 @@
 #define USER_PGTABLES_CEILING  0UL
 #endif
 
+/*
+ * This defines the first usable user address. Platforms
+ * can override its value with custom FIRST_USER_ADDRESS
+ * defined in their respective <asm/pgtable.h>.
+ */
+#ifndef FIRST_USER_ADDRESS
+#define FIRST_USER_ADDRESS     0UL
+#endif
+
 /*
  * A page table page can be thought of an array like this: pXd_t[PTRS_PER_PxD]
  *