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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 1698b845761f..ecd621fd27d2 100644
--- a/include/linux/compiler-gcc3.h
+++ b/include/linux/compiler-gcc3.h
@@ -13,4 +13,10 @@
13#define __must_check __attribute__((warn_unused_result)) 13#define __must_check __attribute__((warn_unused_result))
14#endif 14#endif
15 15
16/*
17 * A trick to suppress uninitialized variable warning without generating any
18 * code
19 */
20#define uninitialized_var(x) x = x
21
16#define __always_inline inline __attribute__((always_inline)) 22#define __always_inline inline __attribute__((always_inline))
diff --git a/include/linux/compiler-gcc4.h b/include/linux/compiler-gcc4.h
index 6f5cc6f0e7a6..fd0cc7c4a636 100644
--- a/include/linux/compiler-gcc4.h
+++ b/include/linux/compiler-gcc4.h
@@ -16,3 +16,9 @@
16#define __must_check __attribute__((warn_unused_result)) 16#define __must_check __attribute__((warn_unused_result))
17#define __compiler_offsetof(a,b) __builtin_offsetof(a,b) 17#define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
18#define __always_inline inline __attribute__((always_inline)) 18#define __always_inline inline __attribute__((always_inline))
19
20/*
21 * A trick to suppress uninitialized variable warning without generating any
22 * code
23 */
24#define uninitialized_var(x) x = x
diff --git a/include/linux/compiler-intel.h b/include/linux/compiler-intel.h
index 1d1c3ceaff4e..a436eea43912 100644
--- a/include/linux/compiler-intel.h
+++ b/include/linux/compiler-intel.h
@@ -22,3 +22,5 @@
22 (typeof(ptr)) (__ptr + (off)); }) 22 (typeof(ptr)) (__ptr + (off)); })
23 23
24#endif 24#endif
25
26#define uninitialized_var(x) x
diff --git a/mm/memory.c b/mm/memory.c
index c252aae544e9..1d647ab0ee72 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,
1455 pte_t *pte; 1455 pte_t *pte;
1456 int err; 1456 int err;
1457 struct page *pmd_page; 1457 struct page *pmd_page;
1458 spinlock_t *ptl = ptl; /* Suppress gcc warning */ 1458 spinlock_t *uninitialized_var(ptl);
1459 1459
1460 pte = (mm == &init_mm) ? 1460 pte = (mm == &init_mm) ?
1461 pte_alloc_kernel(pmd, addr) : 1461 pte_alloc_kernel(pmd, addr) :