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-rw-r--r--include/linux/compiler-gcc3.h6
-rw-r--r--include/linux/compiler-gcc4.h6
-rw-r--r--include/linux/compiler-intel.h2
-rw-r--r--mm/memory.c2
4 files changed, 15 insertions, 1 deletions
diff --git a/include/linux/compiler-gcc3.h b/include/linux/compiler-gcc3.h
index 1698b84..ecd621f 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 6f5cc6f..fd0cc7c 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 1d1c3ce..a436eea 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 c252aae..1d647ab 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) :