From: Peter Oberparleiter oberpar@linux.ibm.com
[ Upstream commit 40249c6962075c040fd071339acae524f18bfac9 ]
Using gcov to collect coverage data for kernels compiled with GCC 10.1 causes random malfunctions and kernel crashes. This is the result of a changed GCOV_COUNTERS value in GCC 10.1 that causes a mismatch between the layout of the gcov_info structure created by GCC profiling code and the related structure used by the kernel.
Fix this by updating the in-kernel GCOV_COUNTERS value. Also re-enable config GCOV_KERNEL for use with GCC 10.
Reported-by: Colin Ian King colin.king@canonical.com Reported-by: Leon Romanovsky leonro@nvidia.com Signed-off-by: Peter Oberparleiter oberpar@linux.ibm.com Tested-by: Leon Romanovsky leonro@nvidia.com Tested-and-Acked-by: Colin Ian King colin.king@canonical.com Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/gcov/gcc_4_7.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/kernel/gcov/gcc_4_7.c b/kernel/gcov/gcc_4_7.c index ca5e5c0ef8536..5b9e76117ded1 100644 --- a/kernel/gcov/gcc_4_7.c +++ b/kernel/gcov/gcc_4_7.c @@ -19,7 +19,9 @@ #include <linux/vmalloc.h> #include "gcov.h"
-#if (__GNUC__ >= 7) +#if (__GNUC__ >= 10) +#define GCOV_COUNTERS 8 +#elif (__GNUC__ >= 7) #define GCOV_COUNTERS 9 #elif (__GNUC__ > 5) || (__GNUC__ == 5 && __GNUC_MINOR__ >= 1) #define GCOV_COUNTERS 10