[PATCH 3/3] tracing: Fix simple_ring_buffer undef check on sparc64

[Vincent Donnefort <vdonnefort@google.com>]

simple_ring_buffer relies on headers that end up including
<asm/thread_info.h>. On sparc64, this emits the undefined symbol
current_thread_info_reg. Allow this symbol.

Fixes: 1211907ac0b5 ("tracing: Generate undef symbols allowlist for simple_ring_buffer")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Closes: https://lore.kernel.org/all/5574c9e6-9ed2-4ee6-a2b2-fb6ee81e83a1@roeck-us.net/
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
---
 kernel/trace/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 0e1846f7dda3..3860bc53a4be 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -146,6 +146,7 @@ KASAN_SANITIZE_undefsyms_base.o := y
 
 UNDEFINED_ALLOWLIST = __asan __gcov __kasan __kcsan __hwasan __sancov __sanitizer __tsan __ubsan __msan \
 		      __aeabi_unwind_cpp __s390_indirect_jump __x86_indirect_thunk simple_ring_buffer \
+		      current_thread_info_reg \
 		      $(shell $(NM) -u $(obj)/undefsyms_base.o 2>/dev/null | awk '$$2 {print $$2}')
 
 quiet_cmd_check_undefined = NM      $<
-- 
2.55.0.1082.g2b9226bbc0-goog