From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1AB1331328E; Tue, 16 Jun 2026 16:42:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781628138; cv=none; b=prLwFgBbh1XrwoRmAxguhUDhCzbqS/mQOyoYRBRdThh/r+EVzQPP4E4ItywZSic0SF5zpQQzO6B347nfJJanZJnev7VTjz/bX788r2Le/p3+NQkXpNyN7VkAnpKgqI//qpk0OdcEbtS4RrjCJ7cTozKFFmLn/09wgM91sjhS/Gs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781628138; c=relaxed/simple; bh=sO6Rq1HFjWDOC9JKKlYka0EEACZ6aTS/VbjLiITeHpI=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=tyldcuA+7+Oh5d3Mf7EWVCNstNz66MThPljvXNjt1U0vH88AMhc7LnikXhbKOe+uENmYt8smYyo6mzNXaaXIMCRCFKcMrsmPd7HdjS2DeEDpf2FGHVwveBpVD0U8AdB+5RotRI6YD9wOPvlSpomEh0076AdN1iUCDWL/GK+o+XE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XhSql8sh; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="XhSql8sh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F3F631F00A3A; Tue, 16 Jun 2026 16:42:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781628137; bh=WaY/rbS420Gmc1Tqy6etdzSmMfvQbWA42QK9YPs6A5U=; h=From:To:Cc:Subject:Date; b=XhSql8sh87/tp6TBHWKqpN65v4P0k4fKzWPMNKZKHC4GWdtUj1s6vUatd/ORqqHCL 5H9Z19S7QpU4FlllNqKEvNYD4eOUHzCbTcxzTpIpkzCJPGYuCjjKYtFhOTudPc1Pal FuMgfBteJs6CIzTHTHdLR7mnEykAOGMLn2gKhJxPhqPAN6DIjr1Ts4V/tla4D4wfXm 00OdL62+6f/bteUmNxQVdwtqR27yxqfVg1oVgHfuz1UKFWebeqiMKxksI5i8DzmX0J Ke9mUnSxGwVP76pxFjnLbdqK9xBldd7urmc0tDnaOSYsKRIHEFyv0Bhev7COTYAiuJ 5HgGsUAxUydsQ== From: Arnd Bergmann To: Steven Rostedt , Masami Hiramatsu , Nathan Chancellor Cc: Arnd Bergmann , Mathieu Desnoyers , Nick Desaulniers , Bill Wendling , Justin Stitt , Vincent Donnefort , Marc Zyngier , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Paolo Bonzini , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH] tracing: ring-buffer: allowlist clang-generated symbols Date: Tue, 16 Jun 2026 18:42:03 +0200 Message-Id: <20260616164211.3733326-1-arnd@kernel.org> X-Mailer: git-send-email 2.39.5 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Arnd Bergmann 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 --- 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