diff --git a/include/linux/compiler-gcc3.h b/include/linux/compiler-gcc3.h
index 1698b845761f0127b640135e783b5f7ed0758a62..ecd621fd27d2415376ea1d123b353edfd2ee7843 100644
--- a/include/linux/compiler-gcc3.h
+++ b/include/linux/compiler-gcc3.h
@@ -13,4 +13,10 @@
 #define __must_check		__attribute__((warn_unused_result))
 #endif
 
+/*
+ * A trick to suppress uninitialized variable warning without generating any
+ * code
+ */
+#define uninitialized_var(x) x = x
+
 #define __always_inline		inline __attribute__((always_inline))
diff --git a/include/linux/compiler-gcc4.h b/include/linux/compiler-gcc4.h
index 6f5cc6f0e7a66ca521fb1978f27a51099666ec3d..fd0cc7c4a636e77dbf5a502b31b85f760cb088e9 100644
--- a/include/linux/compiler-gcc4.h
+++ b/include/linux/compiler-gcc4.h
@@ -16,3 +16,9 @@
 #define __must_check 		__attribute__((warn_unused_result))
 #define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
 #define __always_inline		inline __attribute__((always_inline))
+
+/*
+ * A trick to suppress uninitialized variable warning without generating any
+ * code
+ */
+#define uninitialized_var(x) x = x
diff --git a/include/linux/compiler-intel.h b/include/linux/compiler-intel.h
index 1d1c3ceaff4ed62b6b2e971a0ca7588f969c8431..a436eea439120fb63df3ecb46fe220a2b88e5e23 100644
--- a/include/linux/compiler-intel.h
+++ b/include/linux/compiler-intel.h
@@ -22,3 +22,5 @@
     (typeof(ptr)) (__ptr + (off)); })
 
 #endif
+
+#define uninitialized_var(x) x
diff --git a/mm/memory.c b/mm/memory.c
index c252aae544e9341925bed2cb49ec7b0e3bc7e9d3..1d647ab0ee72d02f8ad735273d46b862b3fbcee9 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1455,7 +1455,7 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
 	pte_t *pte;
 	int err;
 	struct page *pmd_page;
-	spinlock_t *ptl = ptl;		/* Suppress gcc warning */
+	spinlock_t *uninitialized_var(ptl);
 
 	pte = (mm == &init_mm) ?
 		pte_alloc_kernel(pmd, addr) :