perf top: Make perf_env locally scoped

The use of the global host perf_env variable is potentially
inconsistent within the code. Switch perf top to using a locally
scoped variable that is generally accessed through the session.

Signed-off-by: Ian Rogers <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

Author: captain5050

tools/perf/builtin-top.c

@@ -1301,7 +1301,7 @@ static int __cmd_top(struct perf_top *top)
 	perf_set_multithreaded();
 
 	if (perf_hpp_list.socket) {
-		ret = perf_env__read_cpu_topology_map(&perf_env);
+		ret = perf_env__read_cpu_topology_map(perf_session__env(top->session));
 		if (ret < 0) {
 			char errbuf[BUFSIZ];
 			const char *err = str_error_r(-ret, errbuf, sizeof(errbuf));
@@ -1624,6 +1624,7 @@ int cmd_top(int argc, const char **argv)
 		NULL
 	};
 	int status = hists__init();
+	struct perf_env host_env;
 
 	if (status < 0)
 		return status;
@@ -1637,14 +1638,19 @@ int cmd_top(int argc, const char **argv)
 	if (top.evlist == NULL)
 		return -ENOMEM;
 
+	perf_env__init(&host_env);
 	status = perf_config(perf_top_config, &top);
 	if (status)
-		return status;
+		goto out_delete_evlist;
 	/*
 	 * Since the per arch annotation init routine may need the cpuid, read
 	 * it here, since we are not getting this from the perf.data header.
 	 */
-	status = perf_env__read_cpuid(&perf_env);
+	status = perf_env__set_cmdline(&host_env, argc, argv);
+	if (status)
+		goto out_delete_evlist;
+
+	status = perf_env__read_cpuid(&host_env);
 	if (status) {
 		/*
 		 * Some arches do not provide a get_cpuid(), so just use pr_debug, otherwise
@@ -1661,18 +1667,24 @@ int cmd_top(int argc, const char **argv)
 
 	if (disassembler_style) {
 		annotate_opts.disassembler_style = strdup(disassembler_style);
-		if (!annotate_opts.disassembler_style)
-			return -ENOMEM;
+		if (!annotate_opts.disassembler_style) {
+			status = -ENOMEM;
+			goto out_delete_evlist;
+		}
 	}
 	if (objdump_path) {
 		annotate_opts.objdump_path = strdup(objdump_path);
-		if (!annotate_opts.objdump_path)
-			return -ENOMEM;
+		if (!annotate_opts.objdump_path) {
+			status = -ENOMEM;
+			goto out_delete_evlist;
+		}
 	}
 	if (addr2line_path) {
 		symbol_conf.addr2line_path = strdup(addr2line_path);
-		if (!symbol_conf.addr2line_path)
-			return -ENOMEM;
+		if (!symbol_conf.addr2line_path) {
+			status = -ENOMEM;
+			goto out_delete_evlist;
+		}
 	}
 
 	status = symbol__validate_sym_arguments();
@@ -1735,7 +1747,7 @@ int cmd_top(int argc, const char **argv)
 		symbol_conf.show_branchflag_count = true;
 
 	if (opts->branch_stack) {
-		status = perf_env__read_core_pmu_caps(&perf_env);
+		status = perf_env__read_core_pmu_caps(&host_env);
 		if (status) {
 			pr_err("PMU capability data is not available\n");
 			goto out_delete_evlist;
@@ -1829,14 +1841,16 @@ int cmd_top(int argc, const char **argv)
 		perf_top__update_print_entries(&top);
 		signal(SIGWINCH, winch_sig);
 	}
-	top.session->env = &perf_env;
 
-	top.session = perf_session__new(NULL, NULL);
+	top.session = __perf_session__new(/*data=*/NULL, /*tool=*/NULL,
+					  /*trace_event_repipe=*/false,
+					  &host_env);
 	if (IS_ERR(top.session)) {
 		status = PTR_ERR(top.session);
 		top.session = NULL;
 		goto out_delete_evlist;
 	}
+	top.evlist->session = top.session;
 
 	if (!evlist__needs_bpf_sb_event(top.evlist))
 		top.record_opts.no_bpf_event = true;
@@ -1851,7 +1865,7 @@ int cmd_top(int argc, const char **argv)
 			goto out_delete_evlist;
 		}
 
-		if (evlist__add_bpf_sb_event(top.sb_evlist, &perf_env)) {
+		if (evlist__add_bpf_sb_event(top.sb_evlist, &host_env)) {
 			pr_err("Couldn't ask for PERF_RECORD_BPF_EVENT side band events.\n.");
 			status = -EINVAL;
 			goto out_delete_evlist;
@@ -1873,6 +1887,7 @@ int cmd_top(int argc, const char **argv)
 	evlist__delete(top.evlist);
 	perf_session__delete(top.session);
 	annotation_options__exit();
+	perf_env__exit(&host_env);
 
 	return status;
 }