From: Arnd Bergmann <>

3.12-stable review patch.  If anyone has any objections, please let me know.


commit e72e2dfe7c16ffbfbabf9cb24adc6d9f93a4fe37 upstream.

When gcov profiling is enabled, we see a lot of spurious warnings about
possibly uninitialized variables being used:

arch/arm/mm/dma-mapping.c: In function 'arm_coherent_iommu_map_page':
arch/arm/mm/dma-mapping.c:1085:16: warning: 'start' may be used uninitialized 
in this function [-Wmaybe-uninitialized]
drivers/clk/st/clk-flexgen.c: In function 'st_of_flexgen_setup':
drivers/clk/st/clk-flexgen.c:323:9: warning: 'num_parents' may be used 
uninitialized in this function [-Wmaybe-uninitialized]
kernel/cgroup.c: In function 'cgroup_mount':
kernel/cgroup.c:2119:11: warning: 'root' may be used uninitialized in this 
function [-Wmaybe-uninitialized]

All of these are false positives, so it seems better to just disable
the warnings whenever GCOV is enabled. Most users don't enable GCOV,
and based on a prior patch, it is now also disabled for 'allmodconfig'
builds, so there should be no downsides of doing this.

Signed-off-by: Arnd Bergmann <>
Acked-by: Peter Oberparleiter <>
Signed-off-by: Michal Marek <>
Signed-off-by: Jiri Slaby <>
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index c477e24e892c..c0e575c2594c 100644
--- a/Makefile
+++ b/Makefile
@@ -351,7 +351,7 @@ AFLAGS_MODULE   =
-CFLAGS_GCOV    = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
+CFLAGS_GCOV    = -fprofile-arcs -ftest-coverage -fno-tree-loop-im 
 # Use USERINCLUDE when you must reference the UAPI directories only.

Reply via email to