linux-kernel - [tip:perf/core] perf callchain: Check return value of append_chain

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Date:	Sat, 20 Feb 2016 03:40:51 -0800
From:	tip-bot for Namhyung Kim <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	jolsa@...nel.org, tglx@...utronix.de, mingo@...nel.org,
	peterz@...radead.org, linux-kernel@...r.kernel.org,
	namhyung@...nel.org, hpa@...or.com, acme@...hat.com,
	dsahern@...il.com, andi@...stfloor.org, eranian@...gle.com,
	fweisbec@...il.com, wangnan0@...wei.com
Subject: [tip:perf/core] perf callchain:
  Check return value of append_chain_children()

Commit-ID:  dca0d122e498c054b117bd4aa5568ce90ee142d5
Gitweb:     http://git.kernel.org/tip/dca0d122e498c054b117bd4aa5568ce90ee142d5
Author:     Namhyung Kim <namhyung@...nel.org>
AuthorDate: Tue, 16 Feb 2016 23:08:24 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 19 Feb 2016 19:15:01 -0300

perf callchain: Check return value of append_chain_children()

Now it can check the error case, so check and pass it to the caller.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/r/1455631723-17345-7-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/callchain.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 5259379..24b4bd0 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -586,7 +586,7 @@ append_chain(struct callchain_node *root,
 	     struct callchain_cursor *cursor,
 	     u64 period);
 
-static void
+static int
 append_chain_children(struct callchain_node *root,
 		      struct callchain_cursor *cursor,
 		      u64 period)
@@ -598,7 +598,7 @@ append_chain_children(struct callchain_node *root,
 
 	node = callchain_cursor_current(cursor);
 	if (!node)
-		return;
+		return -1;
 
 	/* lookup in childrens */
 	while (*p) {
@@ -611,6 +611,8 @@ append_chain_children(struct callchain_node *root,
 		ret = append_chain(rnode, cursor, period);
 		if (ret == MATCH_EQ)
 			goto inc_children_hit;
+		if (ret == MATCH_ERROR)
+			return -1;
 
 		if (ret == MATCH_LT)
 			p = &parent->rb_left;
@@ -620,7 +622,7 @@ append_chain_children(struct callchain_node *root,
 	/* nothing in children, add to the current node */
 	rnode = add_child(root, cursor, period);
 	if (rnode == NULL)
-		return;
+		return -1;
 
 	rb_link_node(&rnode->rb_node_in, parent, p);
 	rb_insert_color(&rnode->rb_node_in, &root->rb_root_in);
@@ -628,6 +630,7 @@ append_chain_children(struct callchain_node *root,
 inc_children_hit:
 	root->children_hit += period;
 	root->children_count++;
+	return 0;
 }
 
 static enum match_result
@@ -688,7 +691,8 @@ append_chain(struct callchain_node *root,
 	}
 
 	/* We match the node and still have a part remaining */
-	append_chain_children(root, cursor, period);
+	if (append_chain_children(root, cursor, period) < 0)
+		return MATCH_ERROR;
 
 	return MATCH_EQ;
 }
@@ -702,7 +706,8 @@ int callchain_append(struct callchain_root *root,
 
 	callchain_cursor_commit(cursor);
 
-	append_chain_children(&root->node, cursor, period);
+	if (append_chain_children(&root->node, cursor, period) < 0)
+		return -1;
 
 	if (cursor->nr > root->max_depth)
 		root->max_depth = cursor->nr;
@@ -730,7 +735,8 @@ merge_chain_branch(struct callchain_cursor *cursor,
 
 	if (src->hit) {
 		callchain_cursor_commit(cursor);
-		append_chain_children(dst, cursor, src->hit);
+		if (append_chain_children(dst, cursor, src->hit) < 0)
+			return -1;
 	}
 
 	n = rb_first(&src->rb_root_in);