linux-kernel - [PATCH V12 05/13] perf tools: remove unnecessary callchain validation

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Date:	Mon, 26 Aug 2013 16:00:22 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: [PATCH V12 05/13] perf tools: remove unnecessary callchain validation

Now that the sample parsing correctly checks data sizes
there is no reason for it to be done again for callchains.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Acked-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/callchain.c |  8 --------
 tools/perf/util/callchain.h |  5 -----
 tools/perf/util/session.c   | 20 --------------------
 3 files changed, 33 deletions(-)

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 4fee33b..482f680 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -21,14 +21,6 @@
 
 __thread struct callchain_cursor callchain_cursor;
 
-bool ip_callchain__valid(struct ip_callchain *chain,
-			 const union perf_event *event)
-{
-	unsigned int chain_size = event->header.size;
-	chain_size -= (unsigned long)&event->ip.__more_data - (unsigned long)event;
-	return chain->nr * sizeof(u64) <= chain_size;
-}
-
 #define chain_for_each_child(child, parent)	\
 	list_for_each_entry(child, &parent->children, siblings)
 
diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
index 812d5a0..2b585bc 100644
--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -109,11 +109,6 @@ int callchain_append(struct callchain_root *root,
 int callchain_merge(struct callchain_cursor *cursor,
 		    struct callchain_root *dst, struct callchain_root *src);
 
-struct ip_callchain;
-union perf_event;
-
-bool ip_callchain__valid(struct ip_callchain *chain,
-			 const union perf_event *event);
 /*
  * Initialize a cursor before adding entries inside, but keep
  * the previously allocated entries as a cache.
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index da0a216..1d9ae82 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -997,22 +997,6 @@ static int perf_session_deliver_event(struct perf_session *session,
 	}
 }
 
-static int perf_session__preprocess_sample(struct perf_session *session,
-					   union perf_event *event, struct perf_sample *sample)
-{
-	if (event->header.type != PERF_RECORD_SAMPLE ||
-	    !sample->callchain)
-		return 0;
-
-	if (!ip_callchain__valid(sample->callchain, event)) {
-		pr_debug("call-chain problem with event, skipping it.\n");
-		++session->stats.nr_invalid_chains;
-		session->stats.total_invalid_chains += sample->period;
-		return -EINVAL;
-	}
-	return 0;
-}
-
 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event,
 					    struct perf_tool *tool, u64 file_offset)
 {
@@ -1075,10 +1059,6 @@ static int perf_session__process_event(struct perf_session *session,
 	if (ret)
 		return ret;
 
-	/* Preprocess sample records - precheck callchains */
-	if (perf_session__preprocess_sample(session, event, &sample))
-		return 0;
-
 	if (tool->ordered_samples) {
 		ret = perf_session_queue_event(session, event, &sample,
 					       file_offset);
-- 
1.7.11.7

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