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Sat, 30 May 2026 12:55:27 -0700 (PDT) Received: from archlinux ([205.254.163.119]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84214ce54b8sm5304674b3a.48.2026.05.30.12.55.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 30 May 2026 12:55:26 -0700 (PDT) From: Suchit Karunakaran To: peterz@infradead.org, mingo@redhat.com, acme@kernel.org, namhyung@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, irogers@google.com, adrian.hunter@intel.com, james.clark@linaro.org Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, Suchit Karunakaran Subject: [PATCH v2 2/2] perf build: compile BPF skeletons with -mcpu=v3 Date: Sun, 31 May 2026 01:25:10 +0530 Message-ID: <20260530195511.71452-1-suchitkarunakaran@gmail.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The lock_contention BPF program uses __sync_val_compare_and_swap() to atomically update the max_time and min_time fields in contention_data. This builtin lowers to the BPF_CMPXCHG instruction, which is only available in BPF ISA v3. Without an explicit -mcpu flag, Clang targets BPF v1/v2 by default on older toolchains (Clang < 18), causing build errors when v3 instructions are emitted. Add -mcpu=v3 to CLANG_OPTIONS, which is used exclusively in the BPF skeleton compilation rule. Signed-off-by: Suchit Karunakaran Changes since v1: - Moved the -mcpu=v3 addition from tools/perf/Makefile.perf to tools/perf/bpf_skel.mak, following the refactoring of BPF skeleton build logic into that file. --- tools/perf/bpf_skel.mak | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/perf/bpf_skel.mak b/tools/perf/bpf_skel.mak index 7704e7e635d8..f2559de39f96 100644 --- a/tools/perf/bpf_skel.mak +++ b/tools/perf/bpf_skel.mak @@ -29,7 +29,7 @@ ifneq ($(CROSS_COMPILE),) CLANG_TARGET_ARCH = --target=$(notdir $(CROSS_COMPILE:%-=%)) endif -CLANG_OPTIONS = -Wall +CLANG_OPTIONS = -Wall -mcpu=v3 CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG),$(CLANG_TARGET_ARCH)) LIBBPF_INCLUDE := $(abspath $(or $(OUTPUT),.))/libbpf/include BPF_INCLUDE := -I$(SKEL_TMP_OUT)/.. -I$(SKEL_TOOL_OUT) -I$(LIBBPF_INCLUDE) $(CLANG_SYS_INCLUDES) -- 2.54.0