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author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-25 11:28:49 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-25 11:28:49 -0700 |
commit | 672f8871261597894d46454b8fa1660d6c952af6 (patch) | |
tree | c856b51d187bffa65ff6e79a055c43ab6f6ae528 /tools | |
parent | 87702a337f748d19a59a7826aeeffe0f6aeab7d4 (diff) | |
parent | a4fd8414659bf470e2146b352574bbd274e54b7a (diff) | |
download | linux-672f8871261597894d46454b8fa1660d6c952af6.tar.gz linux-672f8871261597894d46454b8fa1660d6c952af6.tar.bz2 linux-672f8871261597894d46454b8fa1660d6c952af6.zip |
Merge tag 'timers-urgent-2020-10-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer fixes from Thomas Gleixner:
"A time namespace fix and a matching selftest. The futex absolute
timeouts which are based on CLOCK_MONOTONIC require time namespace
corrected. This was missed in the original time namesapce support"
* tag 'timers-urgent-2020-10-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
selftests/timens: Add a test for futex()
futex: Adjust absolute futex timeouts with per time namespace offset
Diffstat (limited to 'tools')
-rw-r--r-- | tools/testing/selftests/timens/Makefile | 2 | ||||
-rw-r--r-- | tools/testing/selftests/timens/futex.c | 110 |
2 files changed, 111 insertions, 1 deletions
diff --git a/tools/testing/selftests/timens/Makefile b/tools/testing/selftests/timens/Makefile index b4fd9a934654..3a5936cc10ab 100644 --- a/tools/testing/selftests/timens/Makefile +++ b/tools/testing/selftests/timens/Makefile @@ -1,4 +1,4 @@ -TEST_GEN_PROGS := timens timerfd timer clock_nanosleep procfs exec +TEST_GEN_PROGS := timens timerfd timer clock_nanosleep procfs exec futex TEST_GEN_PROGS_EXTENDED := gettime_perf CFLAGS := -Wall -Werror -pthread diff --git a/tools/testing/selftests/timens/futex.c b/tools/testing/selftests/timens/futex.c new file mode 100644 index 000000000000..6b2b9264e851 --- /dev/null +++ b/tools/testing/selftests/timens/futex.c @@ -0,0 +1,110 @@ +// SPDX-License-Identifier: GPL-2.0 +#define _GNU_SOURCE +#include <sched.h> + +#include <linux/unistd.h> +#include <linux/futex.h> +#include <stdio.h> +#include <string.h> +#include <sys/syscall.h> +#include <sys/types.h> +#include <sys/wait.h> +#include <time.h> +#include <unistd.h> + +#include "log.h" +#include "timens.h" + +#define NSEC_PER_SEC 1000000000ULL + +static int run_test(int clockid) +{ + int futex_op = FUTEX_WAIT_BITSET; + struct timespec timeout, end; + int val = 0; + + if (clockid == CLOCK_REALTIME) + futex_op |= FUTEX_CLOCK_REALTIME; + + clock_gettime(clockid, &timeout); + timeout.tv_nsec += NSEC_PER_SEC / 10; // 100ms + if (timeout.tv_nsec > NSEC_PER_SEC) { + timeout.tv_sec++; + timeout.tv_nsec -= NSEC_PER_SEC; + } + + if (syscall(__NR_futex, &val, futex_op, 0, + &timeout, 0, FUTEX_BITSET_MATCH_ANY) >= 0) { + ksft_test_result_fail("futex didn't return ETIMEDOUT\n"); + return 1; + } + + if (errno != ETIMEDOUT) { + ksft_test_result_fail("futex didn't return ETIMEDOUT: %s\n", + strerror(errno)); + return 1; + } + + clock_gettime(clockid, &end); + + if (end.tv_sec < timeout.tv_sec || + (end.tv_sec == timeout.tv_sec && end.tv_nsec < timeout.tv_nsec)) { + ksft_test_result_fail("futex slept less than 100ms\n"); + return 1; + } + + + ksft_test_result_pass("futex with the %d clockid\n", clockid); + + return 0; +} + +int main(int argc, char *argv[]) +{ + int status, len, fd; + char buf[4096]; + pid_t pid; + struct timespec mtime_now; + + nscheck(); + + ksft_set_plan(2); + + clock_gettime(CLOCK_MONOTONIC, &mtime_now); + + if (unshare_timens()) + return 1; + + len = snprintf(buf, sizeof(buf), "%d %d 0", + CLOCK_MONOTONIC, 70 * 24 * 3600); + fd = open("/proc/self/timens_offsets", O_WRONLY); + if (fd < 0) + return pr_perror("/proc/self/timens_offsets"); + + if (write(fd, buf, len) != len) + return pr_perror("/proc/self/timens_offsets"); + + close(fd); + + pid = fork(); + if (pid < 0) + return pr_perror("Unable to fork"); + if (pid == 0) { + int ret = 0; + + ret |= run_test(CLOCK_REALTIME); + ret |= run_test(CLOCK_MONOTONIC); + if (ret) + ksft_exit_fail(); + ksft_exit_pass(); + return 0; + } + + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Unable to wait the child process"); + + if (WIFEXITED(status)) + return WEXITSTATUS(status); + + return 1; +} |