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Commit d8694245 authored by John Stultz's avatar John Stultz Committed by Shuah Khan
Browse files

selftests/timers: Add change_skew test from timetest suite 



This patch adds the change_skew test which validates the
adjtimex freq can be set to various values and then using
the inconsistency-check, raw_skew, and nanosleep tests
ensures time behaves properly.

Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
Tested-by: default avatarPrarit Bhargava <prarit@redhat.com>
Signed-off-by: default avatarShuah Khan <shuahkh@osg.samsung.com>
parent b7bb8442

tools/testing/selftests/timers/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -4,7 +4,7 @@ CFLAGS += -O3 -Wl,-no-as-needed -Wall $(BUILD_FLAGS) 
LDFLAGS += -lrt -lpthread

bins = posix_timers nanosleep inconsistency-check nsleep-lat raw_skew \

	set-timer-lat threadtest mqueue-lat valid-adjtimex \

	alarmtimer-suspend

	alarmtimer-suspend change_skew



all: ${bins}
@@ -26,6 +26,7 @@ run_tests: all 
run_destructive_tests: run_tests

	./alarmtimer-suspend

	./valid-adjtimex

	./change_skew



clean:

	rm -f ${bins}

tools/testing/selftests/timers/change_skew.c

0 → 100644
+107 −0
Original line number Diff line number Diff line 
/* ADJ_FREQ Skew change test

 *		by: john stultz (johnstul@us.ibm.com)

 *		(C) Copyright IBM 2012

 *		Licensed under the GPLv2

 *

 *  NOTE: This is a meta-test which cranks the ADJ_FREQ knob and

 *  then uses other tests to detect problems. Thus this test requires

 *  that the raw_skew, inconsistency-check and nanosleep tests be

 *  present in the same directory it is run from.

 *

 *  To build:

 *	$ gcc change_skew.c -o change_skew -lrt

 *

 *   This program is free software: you can redistribute it and/or modify

 *   it under the terms of the GNU General Public License as published by

 *   the Free Software Foundation, either version 2 of the License, or

 *   (at your option) any later version.

 *

 *   This program is distributed in the hope that it will be useful,

 *   but WITHOUT ANY WARRANTY; without even the implied warranty of

 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *   GNU General Public License for more details.

 */





#include <stdio.h>

#include <stdlib.h>

#include <sys/time.h>

#include <sys/timex.h>

#include <time.h>

#ifdef KTEST

#include "../kselftest.h"

#else

static inline int ksft_exit_pass(void)

{

	exit(0);

}

static inline int ksft_exit_fail(void)

{

	exit(1);

}

#endif



#define NSEC_PER_SEC 1000000000LL





int change_skew_test(int ppm)

{

	struct timex tx;

	int ret;



	tx.modes = ADJ_FREQUENCY;

	tx.freq = ppm << 16;



	ret = adjtimex(&tx);

	if (ret < 0) {

		printf("Error adjusting freq\n");

		return ret;

	}



	ret = system("./raw_skew");

	ret |= system("./inconsistency-check");

	ret |= system("./nanosleep");



	return ret;

}





int main(int argv, char **argc)

{

	struct timex tx;

	int i, ret;



	int ppm[5] = {0, 250, 500, -250, -500};



	/* Kill ntpd */

	ret = system("killall -9 ntpd");



	/* Make sure there's no offset adjustment going on */

	tx.modes = ADJ_OFFSET;

	tx.offset = 0;

	ret = adjtimex(&tx);



	if (ret < 0) {

		printf("Maybe you're not running as root?\n");

		return -1;

	}



	for (i = 0; i < 5; i++) {

		printf("Using %i ppm adjustment\n", ppm[i]);

		ret = change_skew_test(ppm[i]);

		if (ret)

			break;

	}



	/* Set things back */

	tx.modes = ADJ_FREQUENCY;

	tx.offset = 0;

	adjtimex(&tx);



	if (ret) {

		printf("[FAIL]");

		return ksft_exit_fail();

	}

	printf("[OK]");

	return ksft_exit_pass();

}