lib: Add library function for parsing kernel config

This is meant as last resort action for disabling tests if certain kernel funcitonality was not present, in general case runtime checks are prefered.

For functionality that can be build as a module tst_check_driver() is most likely better fit since it will also insert requested kernel module into kernel if needed.

For newly added syscalls kernel version comparsion and/or checking errno is prefered.

However in rare cases certain core kernel functionality cannot be detected in any other way than checking the kernel config, which is where this API gets into the play.

The path to the kernel config could be specified by LTP_KCONFIG environment variable, which also takes precedence before the autodetection that attempts to read the config from known locations.

The required kernel options are passed as an array of strings via the .needs_kconfigs pointer in the tst_test structure. The purpose of this is twofold, one is that the test can disable itself at runtime if given functionality is missing from kernel .config and second is about being able to propagate this information to the testrunner (this could be done once we figure out how export the information from the structure to the test runner) then we can avoid running tests on unsuitable configurations from the start.

Signed-off-by Cyril Hrubis <[email protected]>

CC Pengfei Xu <[email protected]>

CC [email protected]

---

  doc/test-writing-guidelines.txt |  32 +++++++
  include/tst_kconfig.h           |  34 ++++++++
  include/tst_test.h              |   6 ++
  lib/newlib_tests/.gitignore     |   1 +
  lib/newlib_tests/tst_kconfig.c  |  24 ++++++
  lib/tst_kconfig.c               | 183 ++++++++++++++++++++++++++++++++++++++++
  lib/tst_test.c                  |   4 +
  7 files changed, 284 insertions(+)

create mode 100644 include/tst_kconfig.h create mode 100644 lib/newlib_tests/tst_kconfig.c create mode 100644 lib/tst_kconfig.c

doc/test-writing-guidelines.txt +32 -0

index d0b91c362..846c39532 100644
@@ -1504,6 +1504,38 @@ static struct tst_test test = {
  	.save_restore = save_restore,
  };
 
+2.2.28 Parsing kernel .config
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Generally testcases should attempt to autodetect as much kernel features as
+possible based on the currently running kernel. We do have tst_check_driver()
+to check if functionality that could be compiled as kernel module is present
+on the system, disabled syscalls can be detected by checking for 'ENOSYS'
+errno etc.
+
+However in rare cases core kernel features couldn't be detected based on the
+kernel userspace API and we have to resort on kernel .config parsing.
+
+For this cases the test should set the 'NULL' terminated needs_kconfig array
+of kernel config options required for the test. The test will exit with
+'TCONF' if any of the required options wasn't set to 'y' or 'm'.
+
+[source,c]
+-------------------------------------------------------------------------------
+#include "tst_test.h"
+
+static const char *kconfigs[] = {
+	"CONFIG_X86_INTEL_UMIP",
+	NULL
+};
+
+static struct tst_test test = {
+	...
+	.needs_kconfigs = kconfigs,
+	...
+};
+-------------------------------------------------------------------------------
+
 
  2.3 Writing a testcase in shell
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

include/tst_kconfig.h new file +34 -0

new file mode 100644
index 000000000..daba808b0
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2018 Cyril Hrubis <[email protected]>
+ */
+
+#ifndef TST_KCONFIG_H__
+#define TST_KCONFIG_H__
+
+/*
+ * Parses kernel config given a CONFIG_FOO symbol.
+ *
+ * The location of the config is detected automatically in case that the config
+ * lives in one of the standard locations or can be set/overrided by setting
+ * LTP_KCONFIG environment variable.
+ *
+ * The functions returns:
+ *
+ * 'y' -- when compiled in
+ * 'm' -- when compiled as a module
+ * 'v' -- when set to some value e.g. CONFIG_BLK_DEV_RAM_COUNT=16
+ * 'n' -- when not set
+ * 'u' -- when CONFIG_FOO wasn't present in CONFIG
+ * 'e' -- on error i.e. .config couldn't be located
+ */
+char tst_kconfig(const char *id);
+
+/*
+ * Exits the test with TCONF on first config option that is not set to 'm' or 'y'
+ *
+ * @kconfigs: NULL terminated array of kernel config options such as "CONFIG_MMU"
+ */
+void tst_kconfig_check(const char *const *kconfigs);
+
+#endif	/* TST_KCONFIG_H__ */

include/tst_test.h +6 -0

index 2ebf746eb..f21687c06 100644
@@ -182,6 +182,12 @@ struct tst_test {
  	 * before setup and restore after cleanup
  	 */
  	const char * const *save_restore;
+
+	/*
+	 * NULL terminated array of kernel config options required for the
+	 * test.
+	 */
+	const char *const *needs_kconfigs;
  };
 
  /*

lib/newlib_tests/.gitignore +1 -0

index c702644f0..4052162bf 100644
@@ -24,3 +24,4 @@ test19
  tst_expiration_timer
  test_exec
  test_exec_child
+tst_kconfig

lib/newlib_tests/tst_kconfig.c new file +24 -0

new file mode 100644
index 000000000..855269366
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2018 Cyril Hrubis <[email protected]>
+ */
+
+#include "tst_test.h"
+#include "tst_kconfig.h"
+
+static void do_test(void)
+{
+	tst_res(TPASS, "Not reached!");
+}
+
+static const char *kconfigs[] = {
+	"CONFIG_MMU",
+	"CONFIG_EXT4_FS",
+	/* Comment this to make the test run */
+	"CONFIG_NONEXISTENT",
+	NULL
+};
+
+static struct tst_test test = {
+	.test_all = do_test,
+	.needs_kconfigs = kconfigs,
+};

lib/tst_kconfig.c new file +183 -0

new file mode 100644
index 000000000..348767b3d
@@ -0,0 +1,183 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2018 Cyril Hrubis <[email protected]>
+ */
+
+#ifndef TST_KCONFIG_H__
+#define TST_KCONFIG_H__
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/utsname.h>
+
+#define TST_NO_DEFAULT_MAIN
+#include "tst_test.h"
+
+static const char *kconfig_path(char *path_buf, size_t path_buf_len)
+{
+	const char *path = getenv("LTP_KCONFIG");
+	struct utsname un;
+
+	if (path) {
+		if (!access(path, F_OK))
+			return path;
+
+		tst_res(TWARN, "LTP_KCONFIG='%s' does not exist", path);
+	}
+
+	if (!access("/proc/config.gz", F_OK))
+		return "/proc/config.gz";
+
+	uname(&un);
+
+	snprintf(path_buf, path_buf_len, "/boot/config-%s", un.release);
+
+	if (!access(path_buf, F_OK))
+		return path_buf;
+
+	tst_res(TINFO, "Couldn't locate kernel config!");
+
+	return NULL;
+}
+
+static char parse_line(const char *line)
+{
+	if (strstr(line, "=y"))
+		return 'y';
+
+	if (strstr(line, "=m"))
+		return 'm';
+
+	if (strstr(line, "="))
+		return 'v';
+
+	return 'n';
+}
+
+static char is_gzip;
+
+static FILE *open_kconfig(void)
+{
+	FILE *fp;
+	char buf[1024];
+	char path_buf[1024];
+	const char *path = kconfig_path(path_buf, sizeof(path_buf));
+
+	if (!path)
+		return NULL;
+
+	is_gzip = !!strstr(path, ".gz");
+
+	if (is_gzip) {
+		snprintf(buf, sizeof(buf), "zcat '%s'", path);
+		fp = popen(buf, "r");
+	} else {
+		fp = fopen(path, "r");
+	}
+
+	if (!fp)
+		tst_brk(TBROK | TERRNO, "Failed to open '%s'", path);
+
+	return fp;
+}
+
+static void close_kconfig(FILE *fp)
+{
+	if (is_gzip)
+		pclose(fp);
+	else
+		fclose(fp);
+}
+
+static int match_option(const char *line, const char *opt)
+{
+	size_t opt_len = strlen(opt);
+
+	return !strncmp(line, opt, opt_len) &&
+		(line[opt_len] == '=' || line[opt_len] == ' ');
+}
+
+char tst_kconfig(const char *id)
+{
+	char buf[1024];
+	char match = 'u';
+	FILE *fp;
+
+	fp = open_kconfig();
+	if (!fp)
+		return 'e';
+
+	while (fgets(buf, sizeof(buf), fp)) {
+		if (match_option(buf, id)) {
+			match = parse_line(buf);
+			break;
+		}
+	}
+
+	close_kconfig(fp);
+
+	return match;
+}
+
+static unsigned int array_len(const char *const *kconfigs)
+{
+	unsigned int i = 0;
+
+	while (kconfigs[i])
+		i++;
+
+	return i;
+}
+
+void tst_kconfig_check(const char *const *kconfigs)
+{
+	char buf[1024];
+	FILE *fp;
+	unsigned int conf_cnt = array_len(kconfigs);
+	unsigned int conf_match[conf_cnt];
+	unsigned int i, j;
+
+	memset(conf_match, 0, sizeof(conf_match));
+
+	fp = open_kconfig();
+	if (!fp)
+		tst_brk(TBROK, "Cannot parse kernel .config");
+
+	while (fgets(buf, sizeof(buf), fp)) {
+		for (i = 0; i < conf_cnt; i++) {
+			if (conf_match[i])
+				continue;
+
+			if (match_option(buf, kconfigs[i]) &&
+			    (strstr(buf, "=y") || strstr(buf, "=m"))) {
+				conf_match[i] = 1;
+
+				for (j = 0; j < conf_cnt; j++) {
+					if (!conf_match[j])
+						break;
+				}
+
+				if (j == i)
+					goto exit;
+			}
+		}
+
+	}
+
+	int abort_test = 0;
+
+	for (i = 0; i < conf_cnt; i++) {
+		if (!conf_match[i]) {
+			abort_test = 1;
+			tst_res(TINFO, "Kernel is missing %s", kconfigs[i]);
+		}
+	}
+
+	if (abort_test)
+		tst_brk(TCONF, "Aborting test due to missing kernel config options!");
+
+exit:
+	close_kconfig(fp);
+}
+
+#endif	/* TST_KCONFIG_H__ */

lib/tst_test.c +4 -0

index 661fbbfce..da3e0c8a0 100644
@@ -36,6 +36,7 @@
  #include "tst_clocks.h"
  #include "tst_timer.h"
  #include "tst_sys_conf.h"
+#include "tst_kconfig.h"
 
  #include "old_resource.h"
  #include "old_device.h"

@@ -770,6 +771,9 @@ static void do_setup(int argc, char *argv[])
  	if (tst_test->tconf_msg)
  		tst_brk(TCONF, "%s", tst_test->tconf_msg);
 
+	if (tst_test->needs_kconfigs)
+		tst_kconfig_check(tst_test->needs_kconfigs);
+
  	assert_test_fn();
 
  	tid = get_tid(argv);

this morning I was just thinking about brutally zcatting config.gz to be able to skip some tests based upon current Kernel configs (not drivers/moduleoptions)...and I'd need a mechanism to do that...then I saw this patch :D

testcases/lib/tst_check_kconfigs.c new file +33 -0

+#define TST_NO_DEFAULT_MAIN
+#include <stdio.h>
+#include <stdlib.h>
+#include <tst_test.h>
+#include <tst_kconfig.h>
+
+int main(int argc, const char **argv)
+{
+       int missing = 0;
+       const char **cfg = NULL;
+
+       if (argc < 2)
+               return -1;
+
+       for (cfg = &argv[1]; !missing && *cfg; cfg++) {
+               char rval = '\0';
+
+               fprintf(stderr, "Check for: %s\n", *cfg);
+               rval = tst_kconfig(*cfg);
+               switch (rval) {
+               case 'y':
+               case 'm':
+                       tst_res(TINFO, "Kernel %s found", *cfg);
+                       break;
+               default:
+                       missing = 1;
+                       tst_res(TINFO, "Kernel is missing %s", *cfg);
+                       break;
+               }
+       }
+
+       return missing;
+}

and it seems to work !

cmdline="quota_remount_test01.sh"
contacts=""
analysis=exit
<<<test_output>>>
incrementing stop
Check for: CONFIG_QFMT_V1
tst_check_kconfigs.c:44: INFO: Kernel is missing CONFIG_QFMT_V1
quota_remount_test01 1 TCONF : ltpapicmd.c:188: Kernel QUOTA
Options NOT configured!
<<<execution_status>>>
initiation_status="ok"
duration=0 termination_type=exited termination_id=32 corefile=no cutime=0 cstime=0

Do you think could be useful ?

Or should be done another way really (I'm brand new to LTP tests...) ?

-----Original Message-----
From: Cyril Hrubis on Thursday, November 15, 2018 5:45 AM

This is meant as last resort action for disabling tests if certain kernel funcitonality was not present, in general case runtime checks are prefered.

For functionality that can be build as a module tst_check_driver() is most likely better fit since it will also insert requested kernel module into kernel if needed.

For newly added syscalls kernel version comparsion and/or checking errno is prefered.

However in rare cases certain core kernel functionality cannot be detected in any other way than checking the kernel config, which is where this API gets into the play.

The path to the kernel config could be specified by LTP_KCONFIG environment variable, which also takes precedence before the autodetection that attempts to read the config from known locations.

It would be nice to use a variable name here that was not project-specific.

In Fuego, we automatically check a few different places, but we don't check a location specified by an environment variable. However, I've wanted to add one. I'd prefer to use the same one as other projects, if possible.

I'm shooting from the hip here, but how about something like:
KCONFIG_PATH
?

-----Original Message-----
From: Cyril Hrubis [mailto:[email protected]]
Hi!

Quoted 4 lines

It would be nice to use a variable name here that was not project-specific.

In Fuego, we automatically check a few different places, but we don't check a location specified by an environment variable. However, I've

wanted to

Quoted 5 lines

add one. I'd prefer to use the same one as other projects, if possible.

I'm shooting from the hip here, but how about something like:
KCONFIG_PATH
?

Fine with me, should I switch to this one in v2?

-----Original Message-----
From: Cyril Hrubis on Thursday, November 15, 2018 5:45 AM

The required kernel options are passed as an array of strings via the .needs_kconfigs pointer in the tst_test structure. The purpose of this is twofold, one is that the test can disable itself at runtime if given functionality is missing from kernel .config and second is about being able to propagate this information to the testrunner (this could be done once we figure out how export the information from the structure to the test runner) then we can avoid running tests on unsuitable configurations from the start.

Signed-off-by Cyril Hrubis <[email protected]>

CC Pengfei Xu <[email protected]>

CC [email protected]

---
 doc/test-writing-guidelines.txt |  32 +++++++
 include/tst_kconfig.h           |  34 ++++++++
 include/tst_test.h              |   6 ++
 lib/newlib_tests/.gitignore     |   1 +
 lib/newlib_tests/tst_kconfig.c  |  24 ++++++
 lib/tst_kconfig.c               | 183
++++++++++++++++++++++++++++++++++++++++
 lib/tst_test.c                  |   4 +
 7 files changed, 284 insertions(+)
 create mode 100644 include/tst_kconfig.h
 create mode 100644 lib/newlib_tests/tst_kconfig.c
 create mode 100644 lib/tst_kconfig.c

doc/test-writing-guidelines.txt +4 -0

index d0b91c362..846c39532 100644
@@ -1504,6 +1504,38 @@ static struct tst_test test = {
 	.save_restore = save_restore,
 };
 
+2.2.28 Parsing kernel .config
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Generally testcases should attempt to autodetect as much kernel features

as
+possible based on the currently running kernel. We do have tst_check_driver()

doc/test-writing-guidelines.txt +5 -0

+to check if functionality that could be compiled as kernel module is present
+on the system, disabled syscalls can be detected by checking for 'ENOSYS'
+errno etc.
+
+However in rare cases core kernel features couldn't be detected based on

the

This is good. Just a comment on the proposed syntax and options. Fuego uses NEED_KCONFIG (upper-case because it's a shell global variable), and 0-day uses need_kconfig.

There are a few slight differences in syntax between different systems. (I'm making no judgements, just noting the differences).

Fuego and 0day also support a string including the option value, such as:
CONFIG_PRINTK=y
CONFIG_LOCKDEP_SUPPORT=n
CONFIG_CAN=m

See https://elinux.org/Test_Dependencies

where I've started collecting some of these different syntaxes.

-----Original Message-----
From: Pengfei Xu

Hi Cyril,
Thanks for kconfig checking API!
It's worked in most of Linux OS.

Just add konfig to support Clear Linux which kconfig is saved in "/lib/kernel/config-xxx"

Quoted 11 lines

-----Original Message-----
From: Pengfei Xu

Hi Cyril,
Thanks for kconfig checking API!
It's worked in most of Linux OS.

Just add konfig to support Clear Linux which kconfig is saved in "/lib/kernel/config-xxx"

Pengfei,

Is /lib/kernel/config-xxx something that only Clear Linux does, or is this a new standard, done by lots of distros?

-- Tim

lib/tst_kconfig.c line 37

Quoted 8 lines

lib/tst_kconfig.c new file +6 -0

new file mode 100644
+
+	snprintf(path_buf, path_buf_len, "/boot/config-%s", un.release);
+
+	if (!access(path_buf, F_OK))
+		return path_buf;
+

Could add suport for Clear Linux kconfig location:

	snprintf(path_buf, path_buf_len, "/lib/kernel/config-%s", un.release);

	if (!access(path_buf, F_OK))
		return path_buf;

Quoted 4 lines

lib/tst_kconfig.c new file +4 -0

+	tst_res(TINFO, "Couldn't locate kernel config!");
+
+	return NULL;
+}

lib/tst_kconfig.c line 172

Quoted 6 lines

lib/tst_kconfig.c new file +6 -0

+	int abort_test = 0;
+
+	for (i = 0; i < conf_cnt; i++) {
+		if (!conf_match[i]) {
+			abort_test = 1;
+			tst_res(TINFO, "Kernel is missing %s", kconfigs[i]);

Could change TINFO above to TCONF?

lib/tst_kconfig.c line 177

Quoted 5 lines

lib/tst_kconfig.c new file +5 -0

+		}
+	}
+
+	if (abort_test)
+		tst_brk(TCONF, "Aborting test due to missing kernel config options!");

	Add 'above' in print?
		tst_brk(TCONF,
			"Aborting test due to missing above kernel config options!");

Quoted 7 lines

lib/tst_kconfig.c line 172

Quoted 6 lines

lib/tst_kconfig.c new file +6 -0

+	int abort_test = 0;
+
+	for (i = 0; i < conf_cnt; i++) {
+		if (!conf_match[i]) {
+			abort_test = 1;
+			tst_res(TINFO, "Kernel is missing %s", kconfigs[i]);

Could change TINFO above to TCONF?

What's the point? We do exit with TCONF below anyway.

Signature · 2 lines

Cyril Hrubis
[email protected]

This is meant as last resort action for disabling tests if certain kernel funcitonality was not present, in general case runtime checks are prefered.

For functionality that can be build as a module tst_check_driver() is most likely better fit since it will also insert requested kernel module into kernel if needed.

For newly added syscalls kernel version comparsion and/or checking errno is prefered.

However in rare cases certain core kernel functionality cannot be detected in any other way than checking the kernel config, which is where this API gets into the play.

The path to the kernel config could be specified by LTP_KCONFIG environment variable, which also takes precedence before the autodetection that attempts to read the config from known locations.

The required kernel options are passed as an array of strings via the .needs_kconfigs pointer in the tst_test structure. The purpose of this is twofold, one is that the test can disable itself at runtime if given functionality is missing from kernel .config and second is about being able to propagate this information to the testrunner (this could be done once we figure out how export the information from the structure to the test runner) then we can avoid running tests on unsuitable configurations from the start.

Signed-off-by Cyril Hrubis <[email protected]>

CC Pengfei Xu <[email protected]>

CC [email protected]

---
 doc/test-writing-guidelines.txt |  32 +++++++
 include/tst_kconfig.h           |  34 ++++++++
 include/tst_test.h              |   6 ++
 lib/newlib_tests/.gitignore     |   1 +
 lib/newlib_tests/tst_kconfig.c  |  24 ++++++
 lib/tst_kconfig.c               | 183 ++++++++++++++++++++++++++++++++++++++++
 lib/tst_test.c                  |   4 +
 7 files changed, 284 insertions(+)
 create mode 100644 include/tst_kconfig.h
 create mode 100644 lib/newlib_tests/tst_kconfig.c
 create mode 100644 lib/tst_kconfig.c

doc/test-writing-guidelines.txt +32 -0

index d0b91c362..846c39532 100644
@@ -1504,6 +1504,38 @@ static struct tst_test test = {
 	.save_restore = save_restore,
 };
 
+2.2.28 Parsing kernel .config
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Generally testcases should attempt to autodetect as much kernel features as
+possible based on the currently running kernel. We do have tst_check_driver()
+to check if functionality that could be compiled as kernel module is present
+on the system, disabled syscalls can be detected by checking for 'ENOSYS'
+errno etc.
+
+However in rare cases core kernel features couldn't be detected based on the
+kernel userspace API and we have to resort on kernel .config parsing.
+
+For this cases the test should set the 'NULL' terminated needs_kconfig array
+of kernel config options required for the test. The test will exit with
+'TCONF' if any of the required options wasn't set to 'y' or 'm'.
+
+[source,c]
+-------------------------------------------------------------------------------
+#include "tst_test.h"
+
+static const char *kconfigs[] = {
+	"CONFIG_X86_INTEL_UMIP",
+	NULL
+};
+
+static struct tst_test test = {
+	...
+	.needs_kconfigs = kconfigs,
+	...
+};
+-------------------------------------------------------------------------------
+
 
 2.3 Writing a testcase in shell
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

include/tst_kconfig.h new file +34 -0

new file mode 100644
index 000000000..daba808b0
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2018 Cyril Hrubis <[email protected]>
+ */
+
+#ifndef TST_KCONFIG_H__
+#define TST_KCONFIG_H__
+
+/*
+ * Parses kernel config given a CONFIG_FOO symbol.
+ *
+ * The location of the config is detected automatically in case that the config
+ * lives in one of the standard locations or can be set/overrided by setting
+ * LTP_KCONFIG environment variable.
+ *
+ * The functions returns:
+ *
+ * 'y' -- when compiled in
+ * 'm' -- when compiled as a module
+ * 'v' -- when set to some value e.g. CONFIG_BLK_DEV_RAM_COUNT=16
+ * 'n' -- when not set
+ * 'u' -- when CONFIG_FOO wasn't present in CONFIG
+ * 'e' -- on error i.e. .config couldn't be located
+ */
+char tst_kconfig(const char *id);
+
+/*
+ * Exits the test with TCONF on first config option that is not set to 'm' or 'y'
+ *
+ * @kconfigs: NULL terminated array of kernel config options such as "CONFIG_MMU"
+ */
+void tst_kconfig_check(const char *const *kconfigs);
+
+#endif	/* TST_KCONFIG_H__ */

include/tst_test.h +6 -0

index 2ebf746eb..f21687c06 100644
@@ -182,6 +182,12 @@ struct tst_test {
 	 * before setup and restore after cleanup
 	 */
 	const char * const *save_restore;
+
+	/*
+	 * NULL terminated array of kernel config options required for the
+	 * test.
+	 */
+	const char *const *needs_kconfigs;
 };
 
 /*

lib/newlib_tests/.gitignore +1 -0

index c702644f0..4052162bf 100644
@@ -24,3 +24,4 @@ test19
 tst_expiration_timer
 test_exec
 test_exec_child
+tst_kconfig

lib/newlib_tests/tst_kconfig.c new file +24 -0

new file mode 100644
index 000000000..855269366
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2018 Cyril Hrubis <[email protected]>
+ */
+
+#include "tst_test.h"
+#include "tst_kconfig.h"
+
+static void do_test(void)
+{
+	tst_res(TPASS, "Not reached!");
+}
+
+static const char *kconfigs[] = {
+	"CONFIG_MMU",
+	"CONFIG_EXT4_FS",
+	/* Comment this to make the test run */
+	"CONFIG_NONEXISTENT",
+	NULL
+};
+
+static struct tst_test test = {
+	.test_all = do_test,
+	.needs_kconfigs = kconfigs,
+};

lib/tst_kconfig.c new file +19 -0

new file mode 100644
index 000000000..348767b3d
@@ -0,0 +1,183 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2018 Cyril Hrubis <[email protected]>
+ */
+
+#ifndef TST_KCONFIG_H__
+#define TST_KCONFIG_H__
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/utsname.h>
+
+#define TST_NO_DEFAULT_MAIN
+#include "tst_test.h"
+
+static const char *kconfig_path(char *path_buf, size_t path_buf_len)
+{
+	const char *path = getenv("LTP_KCONFIG");
+	struct utsname un;