mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-06-01 11:33:59 +02:00
Thomas Weißschuh
057caace52
As the output file is currently never created, the check will run every time, even if the inputs have not changed. Create an empty output file which allows make to skip the execution when it is not necessary. Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Vincent Donnefort <vdonnefort@google.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Link: https://patch.msgid.link/20260520-tracing-ringbuffer-check-v1-1-d979cfab1338@weissschuh.net Fixes:1211907ac0("tracing: Generate undef symbols allowlist for simple_ring_buffer") Fixes:58b4bd1839("tracing: Adjust cmd_check_undefined to show unexpected undefined symbols") Reviewed-by: Nathan Chancellor <nathan@kernel.org> Tested-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
166 lines
6.0 KiB
Makefile
166 lines
6.0 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
|
|
# Do not instrument the tracer itself:
|
|
|
|
ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
|
|
|
|
ifdef CONFIG_FUNCTION_TRACER
|
|
|
|
# Avoid recursion due to instrumentation.
|
|
KCSAN_SANITIZE := n
|
|
|
|
ifdef CONFIG_FTRACE_SELFTEST
|
|
# selftest needs instrumentation
|
|
CFLAGS_trace_selftest_dynamic.o = $(CC_FLAGS_FTRACE)
|
|
obj-y += trace_selftest_dynamic.o
|
|
endif
|
|
endif
|
|
|
|
# Allow some files to be function traced
|
|
ifdef CONFIG_FUNCTION_SELF_TRACING
|
|
CFLAGS_trace_output.o = $(CC_FLAGS_FTRACE)
|
|
CFLAGS_trace_seq.o = $(CC_FLAGS_FTRACE)
|
|
CFLAGS_trace_stat.o = $(CC_FLAGS_FTRACE)
|
|
CFLAGS_tracing_map.o = $(CC_FLAGS_FTRACE)
|
|
CFLAGS_synth_event_gen_test.o = $(CC_FLAGS_FTRACE)
|
|
CFLAGS_trace_events.o = $(CC_FLAGS_FTRACE)
|
|
CFLAGS_trace_syscalls.o = $(CC_FLAGS_FTRACE)
|
|
CFLAGS_trace_events_filter.o = $(CC_FLAGS_FTRACE)
|
|
CFLAGS_trace_events_trigger.o = $(CC_FLAGS_FTRACE)
|
|
CFLAGS_trace_events_synth.o = $(CC_FLAGS_FTRACE)
|
|
CFLAGS_trace_events_hist.o = $(CC_FLAGS_FTRACE)
|
|
CFLAGS_trace_events_user.o = $(CC_FLAGS_FTRACE)
|
|
CFLAGS_trace_dynevent.o = $(CC_FLAGS_FTRACE)
|
|
endif
|
|
|
|
ifdef CONFIG_FTRACE_STARTUP_TEST
|
|
CFLAGS_trace_kprobe_selftest.o = $(CC_FLAGS_FTRACE)
|
|
obj-$(CONFIG_KPROBE_EVENTS) += trace_kprobe_selftest.o
|
|
endif
|
|
|
|
# If unlikely tracing is enabled, do not trace these files
|
|
ifdef CONFIG_TRACING_BRANCHES
|
|
KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
|
|
endif
|
|
|
|
# for GCOV coverage profiling
|
|
ifdef CONFIG_GCOV_PROFILE_FTRACE
|
|
GCOV_PROFILE := y
|
|
endif
|
|
|
|
# Functions in this file could be invoked from early interrupt
|
|
# code and produce random code coverage.
|
|
KCOV_INSTRUMENT_trace_preemptirq.o := n
|
|
|
|
CFLAGS_bpf_trace.o := -I$(src)
|
|
|
|
CFLAGS_trace_benchmark.o := -I$(src)
|
|
CFLAGS_trace_events_filter.o := -I$(src)
|
|
|
|
obj-$(CONFIG_TRACE_CLOCK) += trace_clock.o
|
|
|
|
obj-$(CONFIG_FUNCTION_TRACER) += libftrace.o
|
|
obj-$(CONFIG_RING_BUFFER) += ring_buffer.o
|
|
obj-$(CONFIG_RING_BUFFER_BENCHMARK) += ring_buffer_benchmark.o
|
|
|
|
obj-$(CONFIG_TRACING) += trace.o
|
|
obj-$(CONFIG_TRACING) += trace_output.o
|
|
obj-$(CONFIG_TRACING) += trace_seq.o
|
|
obj-$(CONFIG_TRACING) += trace_stat.o
|
|
obj-$(CONFIG_TRACING) += trace_printk.o
|
|
obj-$(CONFIG_TRACING) += trace_pid.o
|
|
obj-$(CONFIG_TRACER_SNAPSHOT) += trace_snapshot.o
|
|
obj-$(CONFIG_TRACING) += pid_list.o
|
|
obj-$(CONFIG_TRACING_MAP) += tracing_map.o
|
|
obj-$(CONFIG_PREEMPTIRQ_DELAY_TEST) += preemptirq_delay_test.o
|
|
obj-$(CONFIG_SYNTH_EVENT_GEN_TEST) += synth_event_gen_test.o
|
|
obj-$(CONFIG_KPROBE_EVENT_GEN_TEST) += kprobe_event_gen_test.o
|
|
obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
|
|
obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
|
|
obj-$(CONFIG_PREEMPTIRQ_TRACEPOINTS) += trace_preemptirq.o
|
|
obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
|
|
obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o
|
|
obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o
|
|
obj-$(CONFIG_HWLAT_TRACER) += trace_hwlat.o
|
|
obj-$(CONFIG_OSNOISE_TRACER) += trace_osnoise.o
|
|
obj-$(CONFIG_NOP_TRACER) += trace_nop.o
|
|
obj-$(CONFIG_STACK_TRACER) += trace_stack.o
|
|
obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
|
|
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
|
|
obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
|
|
obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
|
|
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += fgraph.o
|
|
ifeq ($(CONFIG_BLOCK),y)
|
|
obj-$(CONFIG_EVENT_TRACING) += blktrace.o
|
|
endif
|
|
obj-$(CONFIG_EVENT_TRACING) += trace_events.o
|
|
obj-$(CONFIG_EVENT_TRACING) += trace_export.o
|
|
obj-$(CONFIG_FTRACE_SYSCALLS) += trace_syscalls.o
|
|
ifeq ($(CONFIG_PERF_EVENTS),y)
|
|
obj-$(CONFIG_EVENT_TRACING) += trace_event_perf.o
|
|
endif
|
|
obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
|
|
obj-$(CONFIG_EVENT_TRACING) += trace_events_trigger.o
|
|
obj-$(CONFIG_EPROBE_EVENTS) += trace_eprobe.o
|
|
obj-$(CONFIG_TRACE_EVENT_INJECT) += trace_events_inject.o
|
|
obj-$(CONFIG_SYNTH_EVENTS) += trace_events_synth.o
|
|
obj-$(CONFIG_HIST_TRIGGERS) += trace_events_hist.o
|
|
obj-$(CONFIG_USER_EVENTS) += trace_events_user.o
|
|
obj-$(CONFIG_BPF_EVENTS) += bpf_trace.o
|
|
obj-$(CONFIG_KPROBE_EVENTS) += trace_kprobe.o
|
|
obj-$(CONFIG_TRACEPOINTS) += error_report-traces.o
|
|
obj-$(CONFIG_TRACEPOINTS) += power-traces.o
|
|
ifeq ($(CONFIG_PM),y)
|
|
obj-$(CONFIG_TRACEPOINTS) += rpm-traces.o
|
|
endif
|
|
ifeq ($(CONFIG_TRACING),y)
|
|
obj-$(CONFIG_KGDB_KDB) += trace_kdb.o
|
|
endif
|
|
obj-$(CONFIG_DYNAMIC_EVENTS) += trace_dynevent.o
|
|
obj-$(CONFIG_PROBE_EVENTS) += trace_probe.o
|
|
obj-$(CONFIG_PROBE_EVENTS_BTF_ARGS) += trace_btf.o
|
|
obj-$(CONFIG_UPROBE_EVENTS) += trace_uprobe.o
|
|
obj-$(CONFIG_BOOTTIME_TRACING) += trace_boot.o
|
|
obj-$(CONFIG_FTRACE_RECORD_RECURSION) += trace_recursion_record.o
|
|
obj-$(CONFIG_FPROBE) += fprobe.o
|
|
obj-$(CONFIG_RETHOOK) += rethook.o
|
|
obj-$(CONFIG_FPROBE_EVENTS) += trace_fprobe.o
|
|
|
|
obj-$(CONFIG_TRACEPOINT_BENCHMARK) += trace_benchmark.o
|
|
obj-$(CONFIG_RV) += rv/
|
|
|
|
obj-$(CONFIG_TRACE_REMOTE) += trace_remote.o
|
|
obj-$(CONFIG_SIMPLE_RING_BUFFER) += simple_ring_buffer.o
|
|
obj-$(CONFIG_TRACE_REMOTE_TEST) += remote_test.o
|
|
|
|
# simple_ring_buffer is used by the pKVM hypervisor which does not have access
|
|
# to all kernel symbols. Fail the build if forbidden symbols are found.
|
|
|
|
# Basic compiler and tooling-generated symbols that can safely be left
|
|
# undefined. Ensure KASAN is enabled to avoid logic that may disable
|
|
# FORTIFY_SOURCE when KASAN is not enabled. undefsyms_base.o does not
|
|
# automatically get KASAN flags because it is not linked into vmlinux.
|
|
targets += undefsyms_base.o
|
|
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 \
|
|
$(shell $(NM) -u $(obj)/undefsyms_base.o 2>/dev/null | awk '{print $$2}')
|
|
|
|
quiet_cmd_check_undefined = NM $<
|
|
cmd_check_undefined = \
|
|
undefsyms=$$($(NM) -u $< | grep -v $(addprefix -e , $(UNDEFINED_ALLOWLIST)) || true); \
|
|
if [ -n "$$undefsyms" ]; then \
|
|
echo "Unexpected symbols in $<:" >&2; \
|
|
echo "$$undefsyms" >&2; \
|
|
false; \
|
|
fi; \
|
|
touch $@
|
|
|
|
$(obj)/%.o.checked: $(obj)/%.o $(obj)/undefsyms_base.o FORCE
|
|
$(call if_changed,check_undefined)
|
|
|
|
always-$(CONFIG_SIMPLE_RING_BUFFER) += simple_ring_buffer.o.checked
|
|
|
|
libftrace-y := ftrace.o
|