perf bench: Make bench its own library

Make the benchmark code into a library so it may be linked against
things like the python module to avoid compiling code twice.

Signed-off-by: Ian Rogers <[e-mail]>
Reviewed-by: James Clark <[e-mail]>
Cc: Suzuki K Poulose <[e-mail]>
Cc: Kees Cook <[e-mail]>
Cc: Palmer Dabbelt <[e-mail]>
Cc: Albert Ou <[e-mail]>
Cc: Nick Terrell <[e-mail]>
Cc: Gary Guo <[e-mail]>
Cc: Alex Gaynor <[e-mail]>
Cc: Boqun Feng <[e-mail]>
Cc: Wedson Almeida Filho <[e-mail]>
Cc: Ze Gao <[e-mail]>
Cc: Alice Ryhl <[e-mail]>
Cc: Andrei Vagin <[e-mail]>
Cc: Yicong Yang <[e-mail]>
Cc: Jonathan Cameron <[e-mail]>
Cc: Guo Ren <[e-mail]>
Cc: Miguel Ojeda <[e-mail]>
Cc: Will Deacon <[e-mail]>
Cc: Mike Leach <[e-mail]>
Cc: Leo Yan <[e-mail]>
Cc: Oliver Upton <[e-mail]>
Cc: John Garry <[e-mail]>
Cc: Benno Lossin <[e-mail]>
Cc: Björn Roy Baron <[e-mail]>
Cc: Andreas Hindborg <[e-mail]>
Cc: Paul Walmsley <[e-mail]>
Signed-off-by: Namhyung Kim <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

tools/perf/Build

···
-perf-y += builtin-bench.o
+perf-bench-y += builtin-bench.o
 perf-y += builtin-annotate.o
 perf-y += builtin-config.o
 perf-y += builtin-diff.o
···
 
 perf-$(CONFIG_LIBELF) += builtin-probe.o
 
-perf-y += bench/
+perf-bench-y += bench/
 perf-test-y += tests/
 
 perf-y += perf.o

tools/perf/Makefile.perf

···
 
 export PERL_PATH
 
+LIBPERF_BENCH_IN := $(OUTPUT)perf-bench-in.o
+LIBPERF_BENCH := $(OUTPUT)libperf-bench.a
+
 LIBPERF_TEST_IN := $(OUTPUT)perf-test-in.o
 LIBPERF_TEST := $(OUTPUT)libperf-test.a
 
···
 ifdef LIBBPF_STATIC
   PERFLIBS += $(LIBBPF)
 endif
-PERFLIBS += $(LIBPERF_TEST) $(LIBPERF_UI) $(LIBPMU_EVENTS)
+PERFLIBS += $(LIBPERF_BENCH) $(LIBPERF_TEST) $(LIBPERF_UI) $(LIBPMU_EVENTS)
 
 # We choose to avoid "if .. else if .. else .. endif endif"
 # because maintaining the nesting to match is a pain.  If
···
 	$(Q)$(MAKE) -f $(srctree)/tools/build/Makefile.build dir=pmu-events obj=pmu-events
 
 $(LIBPMU_EVENTS): $(LIBPMU_EVENTS_IN)
+	$(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $<
+
+$(LIBPERF_BENCH_IN): FORCE prepare
+	$(Q)$(MAKE) $(build)=perf-bench
+
+$(LIBPERF_BENCH): $(LIBPERF_BENCH_IN)
 	$(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $<
 
 $(LIBPERF_TEST_IN): FORCE prepare

tools/perf/bench/Build

···
-perf-y += sched-messaging.o
-perf-y += sched-pipe.o
-perf-y += sched-seccomp-notify.o
-perf-y += syscall.o
-perf-y += mem-functions.o
-perf-y += futex-hash.o
-perf-y += futex-wake.o
-perf-y += futex-wake-parallel.o
-perf-y += futex-requeue.o
-perf-y += futex-lock-pi.o
-perf-y += epoll-wait.o
-perf-y += epoll-ctl.o
-perf-y += synthesize.o
-perf-y += kallsyms-parse.o
-perf-y += find-bit-bench.o
-perf-y += inject-buildid.o
-perf-y += evlist-open-close.o
-perf-y += breakpoint.o
-perf-y += pmu-scan.o
-perf-y += uprobe.o
+perf-bench-y += sched-messaging.o
+perf-bench-y += sched-pipe.o
+perf-bench-y += sched-seccomp-notify.o
+perf-bench-y += syscall.o
+perf-bench-y += mem-functions.o
+perf-bench-y += futex-hash.o
+perf-bench-y += futex-wake.o
+perf-bench-y += futex-wake-parallel.o
+perf-bench-y += futex-requeue.o
+perf-bench-y += futex-lock-pi.o
+perf-bench-y += epoll-wait.o
+perf-bench-y += epoll-ctl.o
+perf-bench-y += synthesize.o
+perf-bench-y += kallsyms-parse.o
+perf-bench-y += find-bit-bench.o
+perf-bench-y += inject-buildid.o
+perf-bench-y += evlist-open-close.o
+perf-bench-y += breakpoint.o
+perf-bench-y += pmu-scan.o
+perf-bench-y += uprobe.o
 
-perf-$(CONFIG_X86_64) += mem-memcpy-x86-64-asm.o
-perf-$(CONFIG_X86_64) += mem-memset-x86-64-asm.o
+perf-bench-$(CONFIG_X86_64) += mem-memcpy-x86-64-asm.o
+perf-bench-$(CONFIG_X86_64) += mem-memset-x86-64-asm.o
 
-perf-$(CONFIG_NUMA) += numa.o
+perf-bench-$(CONFIG_NUMA) += numa.o