linux-kernel - [tip:perf/core] perf test: Fix hist testcases when kptr

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Message-ID: <tip-71d6de64feddd4b455555326fba2111b3006d9e0@git.kernel.org>
Date:	Fri, 18 Dec 2015 00:47:13 -0800
From:	tip-bot for Namhyung Kim <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, namhyung@...nel.org, hpa@...or.com,
	a.p.zijlstra@...llo.nl, adrian.hunter@...el.com, mingo@...nel.org,
	jolsa@...nel.org, dsahern@...il.com, tglx@...utronix.de,
	acme@...hat.com
Subject: [tip:perf/core] perf test:
  Fix hist testcases when kptr_restrict is on

Commit-ID:  71d6de64feddd4b455555326fba2111b3006d9e0
Gitweb:     http://git.kernel.org/tip/71d6de64feddd4b455555326fba2111b3006d9e0
Author:     Namhyung Kim <namhyung@...nel.org>
AuthorDate: Mon, 14 Dec 2015 12:11:13 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 14 Dec 2015 12:15:07 -0300

perf test: Fix hist testcases when kptr_restrict is on

Currently if kptr_restrict is enabled, all hist tests failed with
segfaults.  This is because machine__create_kernel_maps() in
setup_fake_machine() failed in that situation, and it called
machine__delete() on the error path.  But outer callers again called
machines__exit() causing double free for the host machine.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1450062673-22312-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/tests/hists_common.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/tools/perf/tests/hists_common.c b/tools/perf/tests/hists_common.c
index 46f453b..bcfd081 100644
--- a/tools/perf/tests/hists_common.c
+++ b/tools/perf/tests/hists_common.c
@@ -88,8 +88,8 @@ struct machine *setup_fake_machine(struct machines *machines)
 	}
 
 	if (machine__create_kernel_maps(machine)) {
-		pr_debug("Not enough memory for machine setup\n");
-		goto out;
+		pr_debug("Cannot create kernel maps\n");
+		return NULL;
 	}
 
 	for (i = 0; i < ARRAY_SIZE(fake_threads); i++) {
@@ -155,7 +155,6 @@ struct machine *setup_fake_machine(struct machines *machines)
 out:
 	pr_debug("Not enough memory for machine setup\n");
 	machine__delete_threads(machine);
-	machine__delete(machine);
 	return NULL;
 }
 
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