diff options
| -rw-r--r-- | include/linux/compiler-gcc3.h | 6 | ||||
| -rw-r--r-- | include/linux/compiler-gcc4.h | 6 | ||||
| -rw-r--r-- | include/linux/compiler-intel.h | 2 | ||||
| -rw-r--r-- | mm/memory.c | 2 |
4 files changed, 15 insertions, 1 deletions
diff --git a/include/linux/compiler-gcc3.h b/include/linux/compiler-gcc3.h index 1698b845761..ecd621fd27d 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 6f5cc6f0e7a..fd0cc7c4a63 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 1d1c3ceaff4..a436eea4391 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 c252aae544e..1d647ab0ee7 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) : |