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[104.155.91.135]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4923757b8a5sm5686655e9.2.2026.06.17.06.26.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Jun 2026 06:26:40 -0700 (PDT) Date: Wed, 17 Jun 2026 14:26:36 +0100 From: Vincent Donnefort To: Arnd Bergmann Cc: Steven Rostedt , Masami Hiramatsu , Nathan Chancellor , Arnd Bergmann , Mathieu Desnoyers , Nick Desaulniers , Bill Wendling , Justin Stitt , Marc Zyngier , Thomas =?iso-8859-1?Q?Wei=DFschuh?= , Paolo Bonzini , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, llvm@lists.linux.dev Subject: Re: [PATCH] tracing: ring-buffer: allowlist clang-generated symbols Message-ID: References: <20260616164211.3733326-1-arnd@kernel.org> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260616164211.3733326-1-arnd@kernel.org> On Tue, Jun 16, 2026 at 06:42:03PM +0200, Arnd Bergmann wrote: > 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 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 >