[PATCH v2] kcov: don't profile branches in kcov

[Andrey Ryabinin]

Profiling 'if' statements in __sanitizer_cov_trace_pc() leads to
unbound recursion and crash:
	__sanitizer_cov_trace_pc() ->
		ftrace_likely_update ->
			__sanitizer_cov_trace_pc() ...

Define DISABLE_BRANCH_PROFILING to disable this tracer.

Signed-off-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
---
 kernel/kcov.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/kcov.c b/kernel/kcov.c
index 3efbee0..aee961f 100644
--- a/kernel/kcov.c
+++ b/kernel/kcov.c
@@ -1,5 +1,6 @@
 #define pr_fmt(fmt) "kcov: " fmt
 
+#define DISABLE_BRANCH_PROFILING
 #include <linux/compiler.h>
 #include <linux/types.h>
 #include <linux/file.h>
-- 
2.7.3