On Tue, Sep 01, 2009 at 08:11:41PM +0200, Wolfgang Denk wrote:
Dear Anton Vorontsov,
In message 20090901165803.GA3668@oksana.dev.rtsoft.ru you wrote:
This is needed so that we could use this macro for non-UBI code.
Signed-off-by: Anton Vorontsov avorontsov@ru.mvista.com
include/compiler.h | 3 +++ include/ubi_uboot.h | 4 +--- 2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/include/compiler.h b/include/compiler.h index 272fd3c..e602cce 100644 --- a/include/compiler.h +++ b/include/compiler.h @@ -122,4 +122,7 @@ typedef unsigned int uintptr_t;
#endif
+/* compiler options */ +#define uninitialized_var(x) x = x
Please excuse my ignorance, but where and what for is such a definition useful?
It's used to avoid GCC warnings, i.e. when GCC isn't smart enough to see that some variable isn't actually used uninitialized.
~/linux-2.6$ git grep uninitialized_var drivers/ | wc -l 94
We can fix the warnings by assigning some value to a variable at declaration, but the advantage of 'x = x' trick is that it doesn't generate any code.
Thanks,