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Subject[PATCH v4 4/4] selftests: futex: Add support for 32-bit systems with 64-bit time_t
Date
From: Alistair Francis <alistair.francis@wdc.com>

Some 32-bit architectures (such are 32-bit RISC-V) only have a 64-bit
time_t and as such don't have the SYS_futex syscall. This patch will
allow us to use the SYS_futex_time64 syscall on those platforms.

This also converts the futex calls to be y2038 safe (when built for a
5.1+ kernel).

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---
.../futex/functional/futex_requeue_pi.c | 2 +-
.../selftests/futex/include/futextest.h | 44 ++++++++++++++++++-
2 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/futex/functional/futex_requeue_pi.c b/tools/testing/selftests/futex/functional/futex_requeue_pi.c
index 1ee5518ee6b7f..d3673996fed4e 100644
--- a/tools/testing/selftests/futex/functional/futex_requeue_pi.c
+++ b/tools/testing/selftests/futex/functional/futex_requeue_pi.c
@@ -294,7 +294,7 @@ int unit_test(int broadcast, long lock, int third_party_owner, long timeout_ns)
secs = (ts.tv_nsec + timeout_ns) / 1000000000;
ts.tv_nsec = ((int64_t)ts.tv_nsec + timeout_ns) % 1000000000;
ts.tv_sec += secs;
- info("ts.tv_sec = %ld\n", ts.tv_sec);
+ info("ts.tv_sec = %lld\n", ts.tv_sec);
info("ts.tv_nsec = %ld\n", ts.tv_nsec);
tsp = &ts;
}
diff --git a/tools/testing/selftests/futex/include/futextest.h b/tools/testing/selftests/futex/include/futextest.h
index 1b133f81e9b7b..b303d0d492ff7 100644
--- a/tools/testing/selftests/futex/include/futextest.h
+++ b/tools/testing/selftests/futex/include/futextest.h
@@ -17,10 +17,12 @@
#ifndef _FUTEXTEST_H
#define _FUTEXTEST_H

+#include <errno.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <linux/futex.h>
+#include <linux/time_types.h>

typedef volatile u_int32_t futex_t;
#define FUTEX_INITIALIZER 0
@@ -69,14 +71,52 @@ static inline int
futex_syscall(volatile u_int32_t *uaddr, int op, u_int32_t val, struct timespec *timeout,
volatile u_int32_t *uaddr2, int val3, int opflags)
{
- return syscall(SYS_futex, uaddr, op | opflags, val, ts32, uaddr2, val3);
+#if defined(__NR_futex_time64)
+ if (sizeof(*timeout) != sizeof(struct __kernel_old_timespec)) {
+ int ret = syscall(__NR_futex_time64, uaddr, op | opflags, val, timeout,
+ uaddr2, val3);
+ if (ret == 0 || errno != ENOSYS)
+ return ret;
+ }
+#endif
+
+#if defined(__NR_futex)
+ if (sizeof(*timeout) == sizeof(struct __kernel_old_timespec))
+ return syscall(__NR_futex, uaddr, op | opflags, val, timeout, uaddr2, val3);
+
+ if (timeout && timeout->tv_sec == (long)timeout->tv_sec) {
+ struct __kernel_old_timespec ts32;
+
+ ts32.tv_sec = (__kernel_long_t) timeout->tv_sec;
+ ts32.tv_nsec = (__kernel_long_t) timeout->tv_nsec;
+
+ return syscall(__NR_futex, uaddr, op | opflags, val, ts32, uaddr2, val3);
+ } else if (!timeout) {
+ return syscall(__NR_futex, uaddr, op | opflags, val, NULL, uaddr2, val3);
+ }
+#endif
+
+ errno = ENOSYS;
+ return -1;
}

static inline int
futex_syscall_nr_requeue(volatile u_int32_t *uaddr, int op, u_int32_t val, int nr_requeue,
volatile u_int32_t *uaddr2, int val3, int opflags)
{
- return syscall(SYS_futex, uaddr, op | opflags, val, nr_requeue, uaddr2, val3);
+#if defined(__NR_futex_time64)
+ int ret = syscall(__NR_futex_time64, uaddr, op | opflags, val, nr_requeue,
+ uaddr2, val3);
+ if (ret == 0 || errno != ENOSYS)
+ return ret;
+#endif
+
+#if defined(__NR_futex)
+ return syscall(__NR_futex, uaddr, op | opflags, val, nr_requeue, uaddr2, val3);
+#endif
+
+ errno = ENOSYS;
+ return -1;
}

/**
--
2.31.1
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