perf bench: Remove reference to cmd_inject

Avoid `perf bench internals inject-build-id` referencing the
cmd_inject sub-command that requires perf-bench to backward reference
internals of builtins. Replace the reference to cmd_inject with a call
to main. To avoid python.c needing to link with something providing
main, drop the libperf-bench library from the python shared object.

Signed-off-by: Ian Rogers <[e-mail]>
Tested-by: Arnaldo Carvalho de Melo <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Athira Rajeev <[e-mail]>
Cc: Colin Ian King <[e-mail]>
Cc: Dapeng Mi <[e-mail]>
Cc: Howard Chu <[e-mail]>
Cc: Ilya Leoshkevich <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: James Clark <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Josh Poimboeuf <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Michael Petlan <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Thomas Richter <[e-mail]>
Cc: Veronika Molnarova <[e-mail]>
Cc: Weilin Wang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/Makefile.perf

···
 EXTLIBS := $(call filter-out,$(EXCLUDE_EXTLIBS),$(EXTLIBS))
 LIBS = -Wl,--whole-archive $(PERFLIBS) $(EXTRA_PERFLIBS) -Wl,--no-whole-archive -Wl,--start-group $(EXTLIBS) -Wl,--end-group
 
+PERFLIBS_PY := $(call filter-out,$(LIBPERF_BENCH),$(PERFLIBS))
+LIBS_PY = -Wl,--whole-archive $(PERFLIBS_PY) $(EXTRA_PERFLIBS) -Wl,--no-whole-archive -Wl,--start-group $(EXTLIBS) -Wl,--end-group
+
 export INSTALL SHELL_PATH
 
 ### Build rules
···
 # Create python binding output directory if not already present
 $(shell [ -d '$(OUTPUT)python' ] || mkdir -p '$(OUTPUT)python')
 
-$(OUTPUT)python/perf$(PYTHON_EXTENSION_SUFFIX): util/python.c util/setup.py $(PERFLIBS)
+$(OUTPUT)python/perf$(PYTHON_EXTENSION_SUFFIX): util/python.c util/setup.py $(PERFLIBS_PY)
 	$(QUIET_GEN)LDSHARED="$(CC) -pthread -shared" \
-        CFLAGS='$(CFLAGS)' LDFLAGS='$(LDFLAGS) $(LIBS)' \
+        CFLAGS='$(CFLAGS)' LDFLAGS='$(LDFLAGS) $(LIBS_PY)' \
 	  $(PYTHON_WORD) util/setup.py \
 	  --quiet build_ext; \
 	cp $(PYTHON_EXTBUILD_LIB)perf*.so $(OUTPUT)python/

tools/perf/bench/inject-buildid.c

···
 static int nr_dsos;
 static struct bench_dso *dsos;
 
-extern int cmd_inject(int argc, const char *argv[]);
+extern int main(int argc, const char **argv);
 
 static const struct option options[] = {
 	OPT_UINTEGER('i', "iterations", &iterations,
···
 
 	if (data->pid == 0) {
 		const char **inject_argv;
-		int inject_argc = 2;
+		int inject_argc = 3;
 
 		close(data->input_pipe[1]);
 		close(data->output_pipe[0]);
···
 		if (inject_argv == NULL)
 			exit(1);
 
-		inject_argv[0] = strdup("inject");
-		inject_argv[1] = strdup("-b");
+		inject_argv[0] = strdup("perf");
+		inject_argv[1] = strdup("inject");
+		inject_argv[2] = strdup("-b");
 		if (build_id_all)
-			inject_argv[2] = strdup("--buildid-all");
+			inject_argv[3] = strdup("--buildid-all");
 
 		/* signal that we're ready to go */
 		close(ready_pipe[1]);
 
-		cmd_inject(inject_argc, inject_argv);
+		main(inject_argc, inject_argv);
 
 		exit(0);
 	}

tools/perf/util/python.c

···
 #include "util/kwork.h"
 #include "util/sample.h"
 #include <internal/lib.h>
-#include "../builtin.h"
 
 #define _PyUnicode_FromString(arg) \
   PyUnicode_FromString(arg)
···
 				       struct kwork_work *key  __maybe_unused)
 {
 	return NULL;
-}
-
-int cmd_inject(int argc __maybe_unused, const char *argv[] __maybe_unused)
-{
-	return -1;
 }