Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
101 lines
2.0 KiB
C
101 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2022 ARM Limited.
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* Original author: Mark Brown <broonie@kernel.org>
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*/
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// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include "kselftest.h"
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#define EXPECTED_TESTS 1
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int fork_test(void);
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int verify_fork(void);
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/*
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* If we fork the value in the parent should be unchanged and the
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* child should start with the same value. This is called from the
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* fork_test() asm function.
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*/
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int fork_test_c(void)
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{
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pid_t newpid, waiting;
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int child_status, parent_result;
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newpid = fork();
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if (newpid == 0) {
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/* In child */
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if (!verify_fork()) {
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ksft_print_msg("ZA state invalid in child\n");
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exit(0);
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} else {
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exit(1);
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}
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}
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if (newpid < 0) {
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ksft_print_msg("fork() failed: %d\n", newpid);
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return 0;
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}
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parent_result = verify_fork();
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if (!parent_result)
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ksft_print_msg("ZA state invalid in parent\n");
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for (;;) {
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waiting = waitpid(newpid, &child_status, 0);
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if (waiting < 0) {
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if (errno == EINTR)
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continue;
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ksft_print_msg("waitpid() failed: %d\n", errno);
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return 0;
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}
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if (waiting != newpid) {
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ksft_print_msg("waitpid() returned wrong PID\n");
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return 0;
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}
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if (!WIFEXITED(child_status)) {
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ksft_print_msg("child did not exit\n");
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return 0;
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}
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return WEXITSTATUS(child_status) && parent_result;
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}
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}
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int main(int argc, char **argv)
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{
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int ret, i;
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ksft_print_header();
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ksft_set_plan(EXPECTED_TESTS);
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ksft_print_msg("PID: %d\n", getpid());
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/*
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* This test is run with nolibc which doesn't support hwcap and
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* it's probably disproportionate to implement so instead check
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* for the default vector length configuration in /proc.
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*/
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ret = open("/proc/sys/abi/sme_default_vector_length", O_RDONLY, 0);
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if (ret >= 0) {
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ksft_test_result(fork_test(), "fork_test\n");
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} else {
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ksft_print_msg("SME not supported\n");
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for (i = 0; i < EXPECTED_TESTS; i++) {
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ksft_test_result_skip("fork_test\n");
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}
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}
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ksft_finished();
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return 0;
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}
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