[PATCH] trace: skip hwasan

[Qian Cai]

Enabling function tracer with CONFIG_KASAN_SW_TAGS=y (hwasan) tracer
causes the whole system frozen on ThunderX2 systems with 256 CPUs,
because there is a burst of too much pointer access, and then KASAN will
dereference each byte of the shadow address for the tag checking which
will kill all the CPUs.

Signed-off-by: Qian Cai <cai@xxxxxx>
---
 kernel/trace/Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index c2b2148bb1d2..fdd547a68385 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -28,6 +28,11 @@ ifdef CONFIG_GCOV_PROFILE_FTRACE
 GCOV_PROFILE := y
 endif
 
+# Too much pointer access will kill hwasan.
+ifdef CONFIG_KASAN_SW_TAGS
+KASAN_SANITIZE := n
+endif
+
 CFLAGS_trace_benchmark.o := -I$(src)
 CFLAGS_trace_events_filter.o := -I$(src)
 
-- 
2.17.2 (Apple Git-113)