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authorBorislav Petkov <bbpetkov@yahoo.de>2007-05-06 17:49:17 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-07 15:12:52 -0400
commit9490991482a2091a828d997adbc088e24c310a4d (patch)
treedcdd9febee63e82cd792250a8a4c4dd8e6aab4be /include/linux
parenta8127717cb24be7b8827a8d9e0ddbfde6b392146 (diff)
Add unitialized_var() macro for suppressing gcc warnings
Introduce a macro for suppressing gcc from generating a warning about a probable uninitialized state of a variable. Example: - spinlock_t *ptl; + spinlock_t *uninitialized_var(ptl); Not a happy solution, but those warnings are obnoxious. - Using the usual pointlessly-set-it-to-zero approach wastes several bytes of text. - Using a macro means we can (hopefully) do something else if gcc changes cause the `x = x' hack to stop working - Using a macro means that people who are worried about hiding true bugs can easily turn it off. Signed-off-by: Borislav Petkov <bbpetkov@yahoo.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/compiler-gcc3.h6
-rw-r--r--include/linux/compiler-gcc4.h6
-rw-r--r--include/linux/compiler-intel.h2
3 files changed, 14 insertions, 0 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