gcov: disable -Wmaybe-uninitialized warning
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 <arnd@arndb.de> Acked-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: Michal Marek <mmarek@suse.com>
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@ -368,7 +368,7 @@ AFLAGS_MODULE =
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LDFLAGS_MODULE =
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LDFLAGS_MODULE =
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CFLAGS_KERNEL =
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CFLAGS_KERNEL =
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AFLAGS_KERNEL =
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AFLAGS_KERNEL =
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CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
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CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im -Wno-maybe-uninitialized
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CFLAGS_KCOV = -fsanitize-coverage=trace-pc
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CFLAGS_KCOV = -fsanitize-coverage=trace-pc
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