Files
linux/tools/testing/selftests/timers/skew_consistency.c
Bala-Vignesh-Reddy e6fbd1759c selftests: complete kselftest include centralization
This follow-up patch completes centralization of kselftest.h and
ksefltest_harness.h includes in remaining seltests files, replacing all
relative paths with a non-relative paths using shared -I include path in
lib.mk

Tested with gcc-13.3 and clang-18.1, and cross-compiled successfully on
riscv, arm64, x86_64 and powerpc arch.

[reddybalavignesh9979@gmail.com: add selftests include path for kselftest.h]
  Link: https://lkml.kernel.org/r/20251017090201.317521-1-reddybalavignesh9979@gmail.com
Link: https://lkml.kernel.org/r/20251016104409.68985-1-reddybalavignesh9979@gmail.com
Signed-off-by: Bala-Vignesh-Reddy <reddybalavignesh9979@gmail.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/lkml/20250820143954.33d95635e504e94df01930d0@linux-foundation.org/
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Günther Noack <gnoack@google.com>
Cc: Jakub Kacinski <kuba@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mickael Salaun <mic@digikod.net>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Simon Horman <horms@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2025-11-27 14:24:31 -08:00

76 lines
1.8 KiB
C

/* ADJ_FREQ Skew consistency 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 back
* and forth and watches for consistency problems. Thus this test requires
* that the inconsistency-check tests be present in the same directory it
* is run from.
*
* To build:
* $ gcc skew_consistency.c -o skew_consistency -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 <unistd.h>
#include <sys/time.h>
#include <sys/timex.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <sys/wait.h>
#include "kselftest.h"
int main(int argc, char **argv)
{
struct timex tx;
int ret, ppm;
pid_t pid;
printf("Running Asynchronous Frequency Changing Tests...\n");
pid = fork();
if (!pid)
return system("./inconsistency-check -t 60");
ppm = 500;
ret = 0;
while (pid != waitpid(pid, &ret, WNOHANG)) {
ppm = -ppm;
tx.modes = ADJ_FREQUENCY;
tx.freq = ppm << 16;
adjtimex(&tx);
usleep(500000);
}
/* Set things back */
tx.modes = ADJ_FREQUENCY;
tx.offset = 0;
adjtimex(&tx);
if (ret) {
printf("[FAILED]\n");
ksft_exit_fail();
}
printf("[OK]\n");
ksft_exit_pass();
}