perf thread: Make thread__find_symbol() return the symbol searched

Instead of just returning it in al.sym, allowing for some simplification
in its users, and to make it consistent with thread__find_map().

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-4axi2sigslffdixzxbehvgoj@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-timechart.c

@@ -533,11 +533,8 @@ static const char *cat_backtrace(union perf_event *event,
 		}
 
 		tal.filtered = 0;
-		thread__find_symbol(al.thread, cpumode, ip, &tal);
-
-		if (tal.sym)
-			fprintf(f, "..... %016" PRIx64 " %s\n", ip,
-				tal.sym->name);
+		if (thread__find_symbol(al.thread, cpumode, ip, &tal))
+			fprintf(f, "..... %016" PRIx64 " %s\n", ip, tal.sym->name);
 		else
 			fprintf(f, "..... %016" PRIx64 "\n", ip);
 	}

tools/perf/util/event.c

@@ -1566,14 +1566,14 @@ try_again:
 	return al->map;
 }
 
-void __thread__find_symbol(struct thread *thread, u8 cpumode,
-			   enum map_type type, u64 addr,
-			   struct addr_location *al)
+struct symbol *__thread__find_symbol(struct thread *thread, u8 cpumode,
+				     enum map_type type, u64 addr,
+				     struct addr_location *al)
 {
+	al->sym = NULL;
 	if (__thread__find_map(thread, cpumode, type, addr, al))
 		al->sym = map__find_symbol(al->map, al->addr);
-	else
-		al->sym = NULL;
+	return al->sym;
 }
 
 /*

tools/perf/util/thread.h

@@ -101,11 +101,11 @@ static inline struct map *thread__find_map(struct thread *thread, u8 cpumode,
 	return __thread__find_map(thread, cpumode, MAP__FUNCTION, addr, al);
 }
 
-void __thread__find_symbol(struct thread *thread, u8 cpumode, enum map_type type,
-			   u64 addr, struct addr_location *al);
+struct symbol *__thread__find_symbol(struct thread *thread, u8 cpumode, enum map_type type,
+				     u64 addr, struct addr_location *al);
 
-static inline void thread__find_symbol(struct thread *thread, u8 cpumode,
-				       u64 addr, struct addr_location *al)
+static inline struct symbol *thread__find_symbol(struct thread *thread, u8 cpumode,
+						 u64 addr, struct addr_location *al)
 {
 	return __thread__find_symbol(thread, cpumode, MAP__FUNCTION, addr, al);
 }

tools/perf/util/unwind-libunwind-local.c

@@ -584,11 +584,9 @@ static int entry(u64 ip, struct thread *thread,
 	struct unwind_entry e;
 	struct addr_location al;
 
-	thread__find_symbol(thread, PERF_RECORD_MISC_USER, ip, &al);
-
+	e.sym = thread__find_symbol(thread, PERF_RECORD_MISC_USER, ip, &al);
 	e.ip = al.addr;
 	e.map = al.map;
-	e.sym = al.sym;
 
 	pr_debug("unwind: %s:ip = 0x%" PRIx64 " (0x%" PRIx64 ")\n",
 		 al.sym ? al.sym->name : "''",