linux-kernel - [PATCH 3/4] kselftests: timers: Fix inconsistency-check to not ignore first timestamp

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Date:   Tue, 20 Jun 2017 22:21:32 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     Miroslav Lichvar <mlichvar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Richard Cochran <richardcochran@...il.com>,
        Prarit Bhargava <prarit@...hat.com>,
        Stephen Boyd <stephen.boyd@...aro.org>,
        Shuah Khan <shuah@...nel.org>,
        John Stultz <john.stultz@...aro.org>
Subject: [PATCH 3/4] kselftests: timers: Fix inconsistency-check to not ignore first timestamp

From: Miroslav Lichvar <mlichvar@...hat.com>

When the first timestamp in the list of clock readings was later than
the second timestamp and all other timestamps were in order, the
inconsistency was not reported because the index of the out-of-order
timestamp was equal to the default value.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Miroslav Lichvar <mlichvar@...hat.com>
Cc: Richard Cochran <richardcochran@...il.com>
Cc: Prarit Bhargava <prarit@...hat.com>
Cc: Stephen Boyd <stephen.boyd@...aro.org>
Cc: Shuah Khan <shuah@...nel.org>
Signed-off-by: Miroslav Lichvar <mlichvar@...hat.com>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 tools/testing/selftests/timers/inconsistency-check.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/timers/inconsistency-check.c b/tools/testing/selftests/timers/inconsistency-check.c
index caf1bc9..74c60e8 100644
--- a/tools/testing/selftests/timers/inconsistency-check.c
+++ b/tools/testing/selftests/timers/inconsistency-check.c
@@ -118,7 +118,7 @@ int consistency_test(int clock_type, unsigned long seconds)
 	start_str = ctime(&t);
 
 	while (seconds == -1 || now - then < seconds) {
-		inconsistent = 0;
+		inconsistent = -1;
 
 		/* Fill list */
 		for (i = 0; i < CALLS_PER_LOOP; i++)
@@ -130,7 +130,7 @@ int consistency_test(int clock_type, unsigned long seconds)
 				inconsistent = i;
 
 		/* display inconsistency */
-		if (inconsistent) {
+		if (inconsistent >= 0) {
 			unsigned long long delta;
 
 			printf("\%s\n", start_str);
-- 
2.7.4