* [PATCH] tracing: ring-buffer: allowlist clang-generated symbols
@ 2026-06-16 16:42 Arnd Bergmann
2026-06-17 13:26 ` Vincent Donnefort
0 siblings, 1 reply; 2+ messages in thread
From: Arnd Bergmann @ 2026-06-16 16:42 UTC (permalink / raw)
To: Steven Rostedt, Masami Hiramatsu, Nathan Chancellor
Cc: Arnd Bergmann, Mathieu Desnoyers, Nick Desaulniers, Bill Wendling,
Justin Stitt, Vincent Donnefort, Marc Zyngier,
Thomas Weißschuh, Paolo Bonzini, linux-kernel,
linux-trace-kernel, llvm
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 $$2}')
quiet_cmd_check_undefined = NM $<
--
2.39.5
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] tracing: ring-buffer: allowlist clang-generated symbols
2026-06-16 16:42 [PATCH] tracing: ring-buffer: allowlist clang-generated symbols Arnd Bergmann
@ 2026-06-17 13:26 ` Vincent Donnefort
0 siblings, 0 replies; 2+ messages in thread
From: Vincent Donnefort @ 2026-06-17 13:26 UTC (permalink / raw)
To: Arnd Bergmann
Cc: Steven Rostedt, Masami Hiramatsu, Nathan Chancellor,
Arnd Bergmann, Mathieu Desnoyers, Nick Desaulniers, Bill Wendling,
Justin Stitt, Marc Zyngier, Thomas Weißschuh, Paolo Bonzini,
linux-kernel, linux-trace-kernel, llvm
On Tue, Jun 16, 2026 at 06:42:03PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> In randconfig build testing using clang-22, I came across two
> sets of extra symbols in the ring buffer code that may get
> inserted by the compiler:
>
> Unexpected symbols in kernel/trace/simple_ring_buffer.o:
> U memset
>
> Unexpected symbols in kernel/trace/simple_ring_buffer.o:
> U llvm_gcda_emit_arcs
> U llvm_gcda_emit_function
> U llvm_gcda_end_file
> U llvm_gcda_start_file
> U llvm_gcda_summary_info
> U llvm_gcov_init
>
> Add all of these to the allowlist.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> kernel/trace/Makefile | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
> index f934ff586bd4..aa8564fb8ff4 100644
> --- a/kernel/trace/Makefile
> +++ b/kernel/trace/Makefile
> @@ -146,6 +146,7 @@ KASAN_SANITIZE_undefsyms_base.o := y
Would "GCOV_PROFILE_undefsyms_base.o := y" work?
>
> UNDEFINED_ALLOWLIST = __asan __gcov __kasan __kcsan __hwasan __sancov __sanitizer __tsan __ubsan __msan \
> __aeabi_unwind_cpp __s390_indirect_jump __x86_indirect_thunk simple_ring_buffer \
> + memset llvm_gcda llvm_gcov \
> $(shell $(NM) -u $(obj)/undefsyms_base.o 2>/dev/null | awk '{print $$2}')
>
> quiet_cmd_check_undefined = NM $<
> --
> 2.39.5
>
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2026-06-16 16:42 [PATCH] tracing: ring-buffer: allowlist clang-generated symbols Arnd Bergmann
2026-06-17 13:26 ` Vincent Donnefort
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