perf symbols: Fix multiple initialization of symbol system

By returning immediately if it was already initialized, do it as well at
symbol__exit, refusing multiple deinitializations.

This fixes problems in the kmem, sched and timechart commands.

Reported-by: Davidlohr Bueso <dave@gnu.org>
Cc: Davidlohr Bueso <dave@gnu.org>
Signed-off-by: Jovi Zhang <bookjovi@gmail.com>
LKML-Reference: AANLkTi=9Cn=R8SPMCRp5z+gEjXbaBHeb-AaOtRbuwwcn@mail.gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 1a367734e01693c8a93f79bb3846af4a89f9cffe..b2f5ae97f33dded1cdaba3e843ab2df888515777 100644 (file)
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -2268,6 +2268,9 @@ static int setup_list(struct strlist **list, const char *list_str,
 
 int symbol__init(void)
 {
+       if (symbol_conf.initialized)
+               return 0;
+
        elf_version(EV_CURRENT);
        if (symbol_conf.sort_by_name)
                symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
@@ -2293,6 +2296,7 @@ int symbol__init(void)
                       symbol_conf.sym_list_str, "symbol") < 0)
                goto out_free_comm_list;
 
+       symbol_conf.initialized = true;
        return 0;
 
 out_free_dso_list:
@@ -2304,11 +2308,14 @@ out_free_comm_list:
 
 void symbol__exit(void)
 {
+       if (!symbol_conf.initialized)
+               return;
        strlist__delete(symbol_conf.sym_list);
        strlist__delete(symbol_conf.dso_list);
        strlist__delete(symbol_conf.comm_list);
        vmlinux_path__exit();
        symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
+       symbol_conf.initialized = false;
 }
 
 int machines__create_kernel_maps(struct rb_root *self, pid_t pid)

diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index b7a8da4af5a0a98e84e1616e55cdaceec18fcdbf..ea95c2756f05e73d09f6868f24b174ed1221f59a 100644 (file)
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -69,7 +69,8 @@ struct symbol_conf {
                        show_nr_samples,
                        use_callchain,
                        exclude_other,
-                       show_cpu_utilization;
+                       show_cpu_utilization,
+                       initialized;
        const char      *vmlinux_name,
                        *source_prefix,
                        *field_sep;