[tip:perf/urgent] perf thread-stack: Factor out thread_stack__init()

[tip-bot for Adrian Hunter]

Commit-ID:  2e9e8688763ff80f032d9a78c3b4b951fb6dd7a4
Gitweb:     https://git.kernel.org/tip/2e9e8688763ff80f032d9a78c3b4b951fb6dd7a4
Author:     Adrian Hunter <adrian.hunter@xxxxxxxxx>
AuthorDate: Fri, 21 Dec 2018 14:06:17 +0200
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Wed, 2 Jan 2019 10:53:41 -0300

perf thread-stack: Factor out thread_stack__init()

In preparation for fixing thread stack processing for the idle task,
factor out thread_stack__init().

Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/20181221120620.9659-6-adrian.hunter@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/thread-stack.c | 26 +++++++++++++++++++-------
 1 file changed, 19 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/thread-stack.c b/tools/perf/util/thread-stack.c
index a5f7b9d8fc23..03770af9e5cd 100644
--- a/tools/perf/util/thread-stack.c
+++ b/tools/perf/util/thread-stack.c
@@ -93,6 +93,24 @@ static int thread_stack__grow(struct thread_stack *ts)
 	return 0;
 }
 
+static int thread_stack__init(struct thread_stack *ts, struct thread *thread,
+			      struct call_return_processor *crp)
+{
+	int err;
+
+	err = thread_stack__grow(ts);
+	if (err)
+		return err;
+
+	if (thread->mg && thread->mg->machine)
+		ts->kernel_start = machine__kernel_start(thread->mg->machine);
+	else
+		ts->kernel_start = 1ULL << 63;
+	ts->crp = crp;
+
+	return 0;
+}
+
 static struct thread_stack *thread_stack__new(struct thread *thread,
 					      struct call_return_processor *crp)
 {
@@ -104,17 +122,11 @@ static struct thread_stack *thread_stack__new(struct thread *thread,
 
 	ts->arr_sz = 1;
 
-	if (thread_stack__grow(ts)) {
+	if (thread_stack__init(ts, thread, crp)) {
 		free(ts);
 		return NULL;
 	}
 
-	if (thread->mg && thread->mg->machine)
-		ts->kernel_start = machine__kernel_start(thread->mg->machine);
-	else
-		ts->kernel_start = 1ULL << 63;
-	ts->crp = crp;
-
 	thread->ts = ts;
 
 	return ts;