[PATCH 1/3] perf build: Fix cross-arch build failures by isolating auxtrace objects
Li Guan
guanli.oerv at isrc.iscas.ac.cn
Wed May 13 08:48:49 PDT 2026
Currently, tools/perf/util/Build hardcodes architecture-specific hardware
tracing objects (e.g., intel-pt.o, arm-spe.o, cs-etm-base.o) into the
generic perf-util-y list. When compiling on architectures that lack
these features (such as RISC-V), the compiler skips generating these
objects, causing the linker to fail with "No such file or directory"
or undefined references.
Fix this by decoupling the architecture-specific hardware tracing drivers
from the generic build process:
1. In Makefile.config, explicitly export CONFIG_PERF_XYZ feature flags
only for their corresponding target architectures.
2. In util/Build, conditionally link these hardware tracing objects
based on the newly exported feature flags.
3. In util/auxtrace.c, provide __weak stub functions returning -ENOSYS
for the arch-specific processing routines. This ensures successful
linking and graceful degradation when specific drivers are omitted.
Signed-off-by: Li Guan <guanli.oerv at isrc.iscas.ac.cn>
---
tools/perf/Makefile.config | 21 ++++++++++++
tools/perf/util/Build | 20 +++++------
tools/perf/util/auxtrace.c | 70 ++++++++++++++++++++++++++++++++++++++
tools/perf/util/auxtrace.h | 6 ++++
4 files changed, 107 insertions(+), 10 deletions(-)
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 06d7a3f999..13f4b98b2e 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -107,6 +107,27 @@ ifeq ($(SRCARCH),loongarch)
endif
endif
+ifndef NO_AUXTRACE
+ ifeq ($(SRCARCH),x86)
+ $(call detected,CONFIG_PERF_INTEL_PT)
+ $(call detected,CONFIG_PERF_AMD_PT)
+ endif
+
+ ifeq ($(SRCARCH),arm64)
+ $(call detected,CONFIG_PERF_ARM_SPE)
+ $(call detected,CONFIG_PERF_HISI_PTT)
+ $(call detected,CONFIG_PERF_CS_ETM)
+ endif
+
+ ifeq ($(SRCARCH),s390)
+ $(call detected,CONFIG_PERF_S390_CPUMSF)
+ endif
+endif
+
+ifeq ($(SRCARCH),arm64)
+ $(call detected,CONFIG_PERF_ARM64_UNWIND_SUPPORT)
+endif
+
ifeq ($(ARCH),s390)
CFLAGS += -fPIC
endif
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 70cc91d008..79ade6066d 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -132,21 +132,21 @@ perf-util-$(CONFIG_LIBTRACEEVENT) += kvm-stat.o
perf-util-y += kvm-stat-arch/
perf-util-y += lock-contention.o
perf-util-y += auxtrace.o
-perf-util-y += intel-pt-decoder/
-perf-util-y += intel-pt.o
-perf-util-y += intel-bts.o
-perf-util-y += arm-spe.o
-perf-util-y += arm-spe-decoder/
-perf-util-y += hisi-ptt.o
-perf-util-y += hisi-ptt-decoder/
-perf-util-y += s390-cpumsf.o
+perf-util-$(CONFIG_PERF_INTEL_PT) += intel-pt-decoder/
+perf-util-$(CONFIG_PERF_INTEL_PT) += intel-pt.o
+perf-util-$(CONFIG_PERF_INTEL_PT) += intel-bts.o
+perf-util-$(CONFIG_PERF_ARM_SPE) += arm-spe.o
+perf-util-$(CONFIG_PERF_ARM_SPE) += arm-spe-decoder/
+perf-util-$(CONFIG_PERF_HISI_PTT) += hisi-ptt.o
+perf-util-$(CONFIG_PERF_HISI_PTT) += hisi-ptt-decoder/
+perf-util-$(CONFIG_PERF_S390_CPUMSF) += s390-cpumsf.o
perf-util-y += powerpc-vpadtl.o
ifdef CONFIG_LIBOPENCSD
perf-util-y += cs-etm.o
perf-util-y += cs-etm-decoder/
endif
-perf-util-y += cs-etm-base.o
+perf-util-$(CONFIG_PERF_CS_ETM) += cs-etm-base.o
perf-util-y += parse-branch-options.o
perf-util-y += parse-regs-options.o
@@ -168,7 +168,7 @@ perf-util-y += clockid.o
perf-util-y += list_sort.o
perf-util-y += mutex.o
perf-util-y += sharded_mutex.o
-perf-util-y += intel-tpebs.o
+perf-util-$(CONFIG_PERF_INTEL_PT) += intel-tpebs.o
perf-util-$(CONFIG_PERF_BPF_SKEL) += bpf_counter.o
perf-util-$(CONFIG_PERF_BPF_SKEL) += bpf_counter_cgroup.o
diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
index a224687ffb..f6e426c3c5 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -51,6 +51,7 @@
#include "cs-etm.h"
#include "intel-pt.h"
#include "intel-bts.h"
+#include "intel-tpebs.h"
#include "arm-spe.h"
#include "hisi-ptt.h"
#include "s390-cpumsf.h"
@@ -2960,3 +2961,72 @@ bool auxtrace__evsel_is_auxtrace(struct perf_session *session,
return session->auxtrace->evsel_is_auxtrace(session, evsel);
}
+
+/*
+ * Stub functions for architecture-specific features to support cross-platform building.
+ * These weak symbols are overridden by strong symbols when the corresponding
+ * architecture-specific code is compiled in.
+ */
+#ifndef HAVE_ARCH_X86_64_SUPPORT
+int __weak intel_pt_process_auxtrace_info(union perf_event *event __maybe_unused,
+ struct perf_session *session __maybe_unused)
+{
+ return -EOPNOTSUPP;
+}
+
+int __weak intel_bts_process_auxtrace_info(union perf_event *event __maybe_unused,
+ struct perf_session *session __maybe_unused)
+{
+ return -EOPNOTSUPP;
+}
+
+int __weak evsel__tpebs_open(struct evsel *evsel __maybe_unused)
+{
+ return -EOPNOTSUPP;
+}
+
+void __weak evsel__tpebs_close(struct evsel *evsel __maybe_unused)
+{
+}
+
+int __weak evsel__tpebs_read(struct evsel *evsel __maybe_unused,
+ int cpu_map_idx __maybe_unused,
+ int thread __maybe_unused)
+{
+ return -EOPNOTSUPP;
+}
+
+int __weak insn_decode(void *insn __maybe_unused, const void *kaddr __maybe_unused,
+ int len __maybe_unused, int mode __maybe_unused)
+{
+ return -EOPNOTSUPP;
+}
+#endif
+
+#ifndef HAVE_ARCH_ARM64_SUPPORT
+int __weak arm_spe_process_auxtrace_info(union perf_event *event __maybe_unused,
+ struct perf_session *session __maybe_unused)
+{
+ return -EOPNOTSUPP;
+}
+
+int __weak hisi_ptt_process_auxtrace_info(union perf_event *event __maybe_unused,
+ struct perf_session *session __maybe_unused)
+{
+ return -EOPNOTSUPP;
+}
+
+int __weak cs_etm__process_auxtrace_info(union perf_event *event __maybe_unused,
+ struct perf_session *session __maybe_unused)
+{
+ return -EOPNOTSUPP;
+}
+#endif
+
+#ifndef HAVE_ARCH_S390_SUPPORT
+int __weak s390_cpumsf_process_auxtrace_info(union perf_event *event __maybe_unused,
+ struct perf_session *session __maybe_unused)
+{
+ return -EOPNOTSUPP;
+}
+#endif
diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
index 6947f3f284..474e9445b4 100644
--- a/tools/perf/util/auxtrace.h
+++ b/tools/perf/util/auxtrace.h
@@ -699,4 +699,10 @@ void itrace_synth_opts__clear_time_range(struct itrace_synth_opts *opts)
opts->range_num = 0;
}
+/*
+ * Prototypes for architecture-specific functions that require weak stubs
+ * to support cross-platform builds on non-x86 architectures.
+ */
+int insn_decode(void *insn, const void *kaddr, int len, int mode);
+
#endif
--
2.54.0
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