[LTP] [PATCH v8] cpufreq.c: add new test for cpufreq sysfs interface validation

[Kubaj, Piotr]

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2026-05-07 (木) の 13:11 +0200 に Piotr Kubaj さんは書きました:
> Runs various sanity checks for intel_pstate cpufreq sysfs interface.
> 
> Checks whether intel_pstate driver is used, whether it is possible to
> switch scaling_governor to powersave and performance, whether it is
> possible to disable turbo frequency and whether it is possible to
> change
> scaling_min_freq and scaling_max_freq to its minimal valid and
> maximal
> valid values.
> 
> Requires root to write to /sys/devices/system/cpu/intel_pstate/
> (status,
> no_turbo) and per-CPU /sys/devices/system/cpu/cpu*\/cpufreq/
> attributes
> (scaling_governor, scaling_min_freq, scaling_max_freq).
> 
> Motivation: LTP has no regression coverage for the intel_pstate
> cpufreq
> sysfs interface, so breakage in any of these attributes (driver
> exposure, governor switching, active/passive mode transitions,
> no_turbo
> toggling or scaling_{min,max}_freq writes) can reach users
> undetected.
> This test exercises the interface end-to-end to catch such
> regressions.
> 
> Signed-off-by: Piotr Kubaj <piotr.kubaj@intel.com>
> ---
> Address further review:
> 1. better commit message.
> 2. drop SAFE_READ().
> 3. reset setup_done.
>  runtest/power_management_tests               |   1 +
>  testcases/kernel/power_management/.gitignore |   1 +
>  testcases/kernel/power_management/cpufreq.c  | 410
> +++++++++++++++++++
>  3 files changed, 412 insertions(+)
>  create mode 100644 testcases/kernel/power_management/.gitignore
>  create mode 100644 testcases/kernel/power_management/cpufreq.c
> 
> diff --git a/runtest/power_management_tests
> b/runtest/power_management_tests
> index b670da6ec..0bc7dd0c8 100644
> --- a/runtest/power_management_tests
> +++ b/runtest/power_management_tests
> @@ -1,4 +1,5 @@
>  #POWER_MANAGEMENT
> +cpufreq cpufreq
>  runpwtests03 runpwtests03.sh
>  runpwtests04 runpwtests04.sh
>  runpwtests06 runpwtests06.sh
> diff --git a/testcases/kernel/power_management/.gitignore
> b/testcases/kernel/power_management/.gitignore
> new file mode 100644
> index 000000000..7f34e4c2f
> --- /dev/null
> +++ b/testcases/kernel/power_management/.gitignore
> @@ -0,0 +1 @@
> +cpufreq
> diff --git a/testcases/kernel/power_management/cpufreq.c
> b/testcases/kernel/power_management/cpufreq.c
> new file mode 100644
> index 000000000..d157006ba
> --- /dev/null
> +++ b/testcases/kernel/power_management/cpufreq.c
> @@ -0,0 +1,410 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (c) 2026 Piotr Kubaj <piotr.kubaj@intel.com>
> + */
> +
> +/*\
> + * Runs various sanity checks for intel_pstate cpufreq sysfs
> interface.
> + *
> + * Checks whether intel_pstate driver is used, whether it is
> possible to switch
> + * scaling_governor to powersave and performance, whether it is
> possible
> + * to disable turbo frequency and whether it is possible to change
> + * scaling_min_freq and scaling_max_freq to its minimal valid and
> maximal valid
> + * values.
> + *
> + * Requires root to write to /sys/devices/system/cpu/intel_pstate/
> (status,
> + * no_turbo) and per-CPU /sys/devices/system/cpu/cpu*\/cpufreq/
> attributes
> + * (scaling_governor, scaling_min_freq, scaling_max_freq).
> + *
> + * Motivation: LTP has no regression coverage for the intel_pstate
> cpufreq
> + * sysfs interface, so breakage in any of these attributes (driver
> exposure,
> + * governor switching, active/passive mode transitions, no_turbo
> toggling or
> + * scaling_{min,max}_freq writes) can reach users undetected. This
> test
> + * exercises the interface end-to-end to catch such regressions.
> + */
> +
> +#include "tst_test.h"
> +
> +static bool *online;
> +static bool setup_done;
> +static char intel_pstate_status[16];
> +static char (*previous_scaling_governor)[16];
> +static int no_turbo, nproc;
> +static long *previous_scaling_max_freq, *previous_scaling_min_freq;
> +
> +static void cleanup(void)
> +{
> +	char path[PATH_MAX];
> +
> +	if (!setup_done) {
> +		free(online);
> +		free(previous_scaling_max_freq);
> +		free(previous_scaling_min_freq);
> +		free(previous_scaling_governor);
> +		return;
> +	}
> +
> +	SAFE_FILE_PRINTF("/sys/devices/system/cpu/intel_pstate/statu
> s", "%s", intel_pstate_status);
> +	SAFE_FILE_PRINTF("/sys/devices/system/cpu/intel_pstate/no_tu
> rbo", "%d", no_turbo);
> +
> +	for (int i = 0; i < nproc; i++) {
> +		if (!online[i])
> +			continue;
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", i);
> +		SAFE_FILE_PRINTF(path, "%s",
> previous_scaling_governor[i]);
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_max_freq", i);
> +		SAFE_FILE_PRINTF(path, "%ld",
> previous_scaling_max_freq[i]);
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_min_freq", i);
> +		SAFE_FILE_PRINTF(path, "%ld",
> previous_scaling_min_freq[i]);
> +	}
> +
> +	free(online);
> +	free(previous_scaling_max_freq);
> +	free(previous_scaling_min_freq);
> +	free(previous_scaling_governor);
> +	setup_done = false;
> +}
> +
> +static void setup(void)
> +{
> +	char path[PATH_MAX];
> +
> +	if (access("/sys/devices/system/cpu/intel_pstate/status",
> F_OK) == -1)
> +		tst_brk(TCONF, "intel_pstate driver not active");
> +
> +	SAFE_FILE_SCANF("/sys/devices/system/cpu/intel_pstate/no_tur
> bo", "%d", &no_turbo);
> +	SAFE_FILE_SCANF("/sys/devices/system/cpu/intel_pstate/status
> ", "%15s", intel_pstate_status);
> +
> +	nproc = tst_ncpus_conf();
> +	online = SAFE_CALLOC(nproc, sizeof(*online));
> +	previous_scaling_max_freq = SAFE_CALLOC(nproc,
> sizeof(*previous_scaling_max_freq));
> +	previous_scaling_min_freq = SAFE_CALLOC(nproc,
> sizeof(*previous_scaling_min_freq));
> +	previous_scaling_governor = SAFE_CALLOC(nproc,
> sizeof(*previous_scaling_governor));
> +	online[0] = true;
> +	for (int i = 1; i < nproc; i++) {
> +		int tmp;
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/online", i);
> +		SAFE_FILE_SCANF(path, "%d", &tmp);
> +		online[i] = (bool)tmp;
> +	}
> +	for (int i = 0; i < nproc; i++) {
> +		if (!online[i])
> +			continue;
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", i);
> +		SAFE_FILE_SCANF(path, "%15s",
> previous_scaling_governor[i]);
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_max_freq", i);
> +		SAFE_FILE_SCANF(path, "%ld",
> &previous_scaling_max_freq[i]);
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_min_freq", i);
> +		SAFE_FILE_SCANF(path, "%ld",
> &previous_scaling_min_freq[i]);
> +	}
> +
> +	SAFE_FILE_PRINTF("/sys/devices/system/cpu/intel_pstate/statu
> s", "active");
> +
> +	setup_done = true;
> +}
> +
> +static void run(void)
> +{
> +	const char * const cpufreq_nodes[] = {
> +		"affected_cpus",
> +		"cpuinfo_max_freq",
> +		"cpuinfo_min_freq",
> +		"cpuinfo_transition_latency",
> +		"related_cpus",
> +		"scaling_available_governors",
> +		"scaling_cur_freq",
> +		"scaling_driver",
> +		"scaling_governor",
> +		"scaling_max_freq",
> +		"scaling_min_freq",
> +		"scaling_setspeed",
> +		NULL
> +	};
> +	char contents[256] = {0}, path[PATH_MAX],
> path_cpuinfo_min_freq[PATH_MAX];
> +	int no_turbo_val;
> +	long cpuinfo_max_freq = 0, cpuinfo_min_freq = 0,
> scaling_max_freq, scaling_min_freq;
> +
> +	for (int i = 0; i < nproc; i++) {
> +		if (!online[i])
> +			continue;
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_driver", i);
> +
> +		SAFE_FILE_SCANF(path, "%255s", contents);
> +		tst_res(TDEBUG, "Checking whether %s is
> \"intel_pstate\"", path);
> +		if (strstr(contents, "intel_pstate")) {
> +			tst_res(TPASS, "%s is intel_pstate", path);
> +		} else {
> +			tst_res(TINFO, "%s contains: %s", path,
> contents);
> +			tst_res(TFAIL, "%s is not intel_pstate",
> path);
> +		}
> +
> +		for (int j = 0; cpufreq_nodes[j]; j++) {
> +			struct stat stats;
> +
> +			snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/%s", i, cpufreq_nodes[j]);
> +			tst_res(TDEBUG, "Checking whether %s is a
> regular file", path);
> +			SAFE_STAT(path, &stats);
> +			if (!S_ISREG(stats.st_mode)) {
> +				tst_res(TINFO, "%s mode: %o", path,
> stats.st_mode);
> +				tst_res(TFAIL, "%s is not a regular
> file", path);
> +			} else {
> +				tst_res(TPASS, "%s is a regular
> file", path);
> +			}
> +		}
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_available_governors",
> i);
> +		memset(contents, 0, sizeof(contents));
> +		SAFE_FILE_SCANF(path, "%255[^\n]", contents);
> +
> +		tst_res(TDEBUG, "Checking whether %s contains
> \"performance\" and \"powersave\"", path);
> +		if (strstr(contents, "performance") &&
> strstr(contents, "powersave")) {
> +			tst_res(TPASS, "%s contains: %s", path,
> contents);
> +		} else {
> +			tst_res(TINFO, "%s contains: %s", path,
> contents);
> +			tst_res(TFAIL, "%s is not \"performance
> powersave\"", path);
> +		}
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", i);
> +		tst_res(TDEBUG, "Checking %s", path);
> +		memset(contents, 0, sizeof(contents));
> +		SAFE_FILE_SCANF(path, "%255s", contents);
> +		if (strstr(contents, "performance")) {
> +			tst_res(TDEBUG, "%s is \"performance\"",
> path);
> +			tst_res(TDEBUG, "Checking whether %s can be
> switched to \"powersave\"", path);
> +			SAFE_FILE_PRINTF(path, "powersave");
> +			memset(contents, 0, sizeof(contents));
> +			SAFE_FILE_SCANF(path, "%255s", contents);
> +			if (strstr(contents, "powersave"))
> +				tst_res(TPASS, "Changing
> scaling_governor from performance to powersave succeeded");
> +			else
> +				tst_res(TFAIL, "%s: failed to change
> scaling_governor from performance to powersave, current
> scaling_governor: %s", path, contents);
> +
> +		} else if (strstr(contents, "powersave")) {
> +			tst_res(TDEBUG, "%s is \"powersave\"",
> path);
> +			tst_res(TDEBUG, "Checking whether %s can be
> switched to \"performance\"", path);
> +			SAFE_FILE_PRINTF(path, "performance");
> +			memset(contents, 0, sizeof(contents));
> +			SAFE_FILE_SCANF(path, "%255s", contents);
> +			if (strstr(contents, "performance"))
> +				tst_res(TPASS, "Changing
> scaling_governor from powersave to performance succeeded");
> +			else
> +				tst_res(TFAIL, "%s: failed to change
> scaling_governor from powersave to performance, current
> scaling_governor: %s", path, contents);
> +
> +		} else {
> +			tst_brk(TBROK, "Unknown scaling_governor:
> %s", contents);
> +		}
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/cpuinfo_max_freq", i);
> +		snprintf(path_cpuinfo_min_freq,
> sizeof(path_cpuinfo_min_freq),
> "/sys/devices/system/cpu/cpu%d/cpufreq/cpuinfo_min_freq", i);
> +		tst_res(TDEBUG, "Checking whether %s is bigger than
> cpuinfo_min_freq", path);
> +		SAFE_FILE_SCANF(path, "%ld", &cpuinfo_max_freq);
> +
> +		SAFE_FILE_SCANF(path_cpuinfo_min_freq, "%ld",
> &cpuinfo_min_freq);
> +
> +		if (cpuinfo_min_freq > cpuinfo_max_freq)
> +			tst_res(TFAIL, "Value in %s: %ld, should be
> bigger than cpuinfo_min_freq: %ld", path, cpuinfo_max_freq,
> cpuinfo_min_freq);
> +		else
> +			tst_res(TPASS, "Value in %s: %ld, is bigger
> than cpuinfo_min_freq: %ld", path, cpuinfo_max_freq,
> cpuinfo_min_freq);
> +	}
> +
> +	snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/intel_pstate/status");
> +	tst_res(TDEBUG, "Checking whether %s contains \"active\"",
> path);
> +	memset(contents, 0, sizeof(contents));
> +	SAFE_FILE_SCANF(path, "%255s", contents);
> +
> +	if (strstr(contents, "active"))
> +		tst_res(TPASS, "%s is \"active\"", path);
> +	else
> +		tst_res(TFAIL, "%s is not \"active\", but %s", path,
> contents);
> +
> +	tst_res(TDEBUG, "Checking whether %s can be switched to
> \"passive\"", path);
> +	SAFE_FILE_PRINTF(path, "passive");
> +	memset(contents, 0, sizeof(contents));
> +	SAFE_FILE_SCANF(path, "%255s", contents);
> +
> +	if (strstr(contents, "passive"))
> +		tst_res(TPASS, "%s is \"passive\"", path);
> +	else
> +		tst_res(TFAIL, "%s is not \"passive\", but %s",
> path, contents);
> +
> +	tst_res(TDEBUG, "Checking whether %s can be switched back to
> \"active\"", path);
> +	SAFE_FILE_PRINTF(path, "active");
> +	memset(contents, 0, sizeof(contents));
> +	SAFE_FILE_SCANF(path, "%255s", contents);
> +
> +	if (strstr(contents, "active"))
> +		tst_res(TPASS, "%s is \"active\"", path);
> +	else
> +		tst_res(TFAIL, "%s is not \"active\", but %s", path,
> contents);
> +
> +	snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/intel_pstate/no_turbo");
> +	tst_res(TDEBUG, "Checking whether %s can be switched to 1",
> path);
> +	SAFE_FILE_PRINTF(path, "1");
> +	SAFE_FILE_SCANF(path, "%d", &no_turbo_val);
> +
> +	if (no_turbo_val == 1)
> +		tst_res(TPASS, "%s is \"1\"", path);
> +	else
> +		tst_res(TFAIL, "%s is not \"1\", but %d", path,
> no_turbo_val);
> +
> +	tst_res(TDEBUG, "Checking whether %s can be switched back to
> 0", path);
> +	SAFE_FILE_PRINTF(path, "0");
> +	SAFE_FILE_SCANF(path, "%d", &no_turbo_val);
> +
> +	if (no_turbo_val == 0)
> +		tst_res(TPASS, "%s is \"0\"", path);
> +	else
> +		tst_res(TFAIL, "%s is not \"0\", but %d", path,
> no_turbo_val);
> +
> +	tst_res(TDEBUG, "Checking whether
> scaling_available_governors contains \"performance\" and
> \"schedutil\" after switching
> /sys/devices/system/cpu/intel_pstate/status to \"passive\"");
> +	snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/intel_pstate/status");
> +	SAFE_FILE_PRINTF(path, "passive");
> +
> +	for (int i = 0; i < nproc; i++) {
> +		if (!online[i])
> +			continue;
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_available_governors",
> i);
> +		memset(contents, 0, sizeof(contents));
> +		SAFE_FILE_SCANF(path, "%255[^\n]", contents);
> +
> +		tst_res(TDEBUG, "Checking whether %s contains
> \"performance\" and \"schedutil\"", path);
> +		if (strstr(contents, "performance") &&
> strstr(contents, "schedutil")) {
> +			tst_res(TPASS, "%s contains: %s", path,
> contents);
> +		} else {
> +			tst_res(TINFO, "%s contains: %s", path,
> contents);
> +			tst_res(TFAIL, "%s does not contain
> \"performance\" and \"schedutil\"", path);
> +		}
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", i);
> +		tst_res(TDEBUG, "Checking whether %s can be changed
> to performance", path);
> +		SAFE_FILE_PRINTF(path, "performance");
> +		memset(contents, 0, sizeof(contents));
> +		SAFE_FILE_SCANF(path, "%255s", contents);
> +
> +		if (strstr(contents, "performance"))
> +			tst_res(TPASS, "%s is \"performance\"",
> path);
> +		else
> +			tst_res(TFAIL, "%s is not \"performance\",
> but %s", path, contents);
> +
> +		tst_res(TDEBUG, "Checking whether %s can be changed
> to schedutil", path);
> +		SAFE_FILE_PRINTF(path, "schedutil");
> +		memset(contents, 0, sizeof(contents));
> +		SAFE_FILE_SCANF(path, "%255s", contents);
> +
> +		if (strstr(contents, "schedutil"))
> +			tst_res(TPASS, "%s is \"schedutil\"", path);
> +		else
> +			tst_res(TFAIL, "%s is not \"schedutil\", but
> %s", path, contents);
> +	}
> +
> +	for (int i = 0; i < nproc; i++) {
> +		if (!online[i])
> +			continue;
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/cpuinfo_max_freq", i);
> +		tst_res(TDEBUG, "Checking whether %s can be assigned
> to scaling_max_freq and scaling_min_freq", path);
> +		SAFE_FILE_SCANF(path, "%ld", &cpuinfo_max_freq);
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/cpuinfo_min_freq", i);
> +		SAFE_FILE_SCANF(path, "%ld", &cpuinfo_min_freq);
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_max_freq", i);
> +		SAFE_FILE_PRINTF(path, "%ld", cpuinfo_max_freq);
> +		SAFE_FILE_SCANF(path, "%ld", &scaling_max_freq);
> +
> +		if (cpuinfo_max_freq < scaling_max_freq) {
> +			tst_res(TINFO, "cpuinfo_max_freq: %ld",
> cpuinfo_max_freq);
> +			tst_res(TINFO, "scaling_max_freq: %ld",
> scaling_max_freq);
> +			tst_res(TFAIL, "Failure setting %s", path);
> +		} else {
> +			tst_res(TPASS, "Successfully set up %s",
> path);
> +		}
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_min_freq", i);
> +		SAFE_FILE_PRINTF(path, "%ld", cpuinfo_max_freq);
> +		SAFE_FILE_SCANF(path, "%ld", &scaling_min_freq);
> +
> +		if (cpuinfo_max_freq < scaling_min_freq) {
> +			tst_res(TINFO, "cpuinfo_max_freq: %ld",
> cpuinfo_max_freq);
> +			tst_res(TINFO, "scaling_min_freq: %ld",
> scaling_min_freq);
> +			tst_res(TFAIL, "Failure setting %s", path);
> +		} else {
> +			tst_res(TPASS, "Successfully set up %s",
> path);
> +		}
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_min_freq", i);
> +		SAFE_FILE_PRINTF(path, "%ld",
> previous_scaling_min_freq[i]);
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_max_freq", i);
> +		SAFE_FILE_PRINTF(path, "%ld",
> previous_scaling_max_freq[i]);
> +	}
> +
> +	for (int i = 0; i < nproc; i++) {
> +		if (!online[i])
> +			continue;
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/cpuinfo_max_freq", i);
> +		tst_res(TDEBUG, "Checking whether %s can be assigned
> to scaling_max_freq and scaling_min_freq", path);
> +		SAFE_FILE_SCANF(path, "%ld", &cpuinfo_max_freq);
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/cpuinfo_min_freq", i);
> +		SAFE_FILE_SCANF(path, "%ld", &cpuinfo_min_freq);
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_min_freq", i);
> +		SAFE_FILE_PRINTF(path, "%ld", cpuinfo_min_freq);
> +		SAFE_FILE_SCANF(path, "%ld", &scaling_min_freq);
> +
> +		if (cpuinfo_min_freq > scaling_min_freq) {
> +			tst_res(TINFO, "cpuinfo_min_freq: %ld",
> cpuinfo_min_freq);
> +			tst_res(TINFO, "scaling_min_freq: %ld",
> scaling_min_freq);
> +			tst_res(TFAIL, "Failure setting %s", path);
> +		} else {
> +			tst_res(TPASS, "Successfully set up %s",
> path);
> +		}
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_max_freq", i);
> +		SAFE_FILE_PRINTF(path, "%ld", cpuinfo_min_freq);
> +		SAFE_FILE_SCANF(path, "%ld", &scaling_max_freq);
> +
> +		if (cpuinfo_min_freq > scaling_max_freq) {
> +			tst_res(TINFO, "cpuinfo_min_freq: %ld",
> cpuinfo_min_freq);
> +			tst_res(TINFO, "scaling_max_freq: %ld",
> scaling_max_freq);
> +			tst_res(TFAIL, "Failure setting %s", path);
> +		} else {
> +			tst_res(TPASS, "Successfully set up %s",
> path);
> +		}
> +	}
> +
> +	SAFE_FILE_PRINTF("/sys/devices/system/cpu/intel_pstate/statu
> s", "active");
> +
> +	for (int i = 0; i < nproc; i++) {
> +		if (!online[i])
> +			continue;
> +
> +		snprintf(path, sizeof(path),
> "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", i);
> +		SAFE_FILE_PRINTF(path, "%s",
> previous_scaling_governor[i]);
> +	}
> +}
> +
> +static struct tst_test test = {
> +	.cleanup = cleanup,
> +	.needs_kconfigs = (const char *const []) {
> +		"CONFIG_X86_INTEL_PSTATE",
> +		NULL
> +	},
> +	.needs_root = 1,
> +	.setup = setup,
> +	.supported_archs = (const char *const []) {
> +		"x86",
> +		"x86_64",
> +		NULL
> +	},
> +	.test_all = run
> +};
---------------------------------------------------------------------
Intel Technology Poland sp. z o.o.
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Spolka oswiadcza, ze posiada status duzego przedsiebiorcy w rozumieniu ustawy z dnia 8 marca 2013 r. o przeciwdzialaniu nadmiernym opoznieniom w transakcjach handlowych.

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