[PATCH] tracing: ring-buffer: allowlist clang-generated symbols

[PATCH] tracing: ring-buffer: allowlist clang-generated symbols

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

In randconfig build testing using clang-22, I came across two
sets of extra symbols in the ring buffer code that may get
inserted by the compiler:

Unexpected symbols in kernel/trace/simple_ring_buffer.o:
         U memset

Unexpected symbols in kernel/trace/simple_ring_buffer.o:
                 U llvm_gcda_emit_arcs
                 U llvm_gcda_emit_function
                 U llvm_gcda_end_file
                 U llvm_gcda_start_file
                 U llvm_gcda_summary_info
                 U llvm_gcov_init

Add all of these to the allowlist.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 kernel/trace/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index f934ff586bd4..aa8564fb8ff4 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 \
+		      memset llvm_gcda llvm_gcov \
 		      $(shell $(NM) -u $(obj)/undefsyms_base.o 2>/dev/null | awk '{print $$2}')
 
 quiet_cmd_check_undefined = NM      $<
-- 
2.39.5