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Date:   Fri, 15 Oct 2021 10:56:34 +1000
From:   Alistair Francis <alistair.francis@...nsource.wdc.com>
To:     linux-riscv@...ts.infradead.org, linux-perf-users@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, alistair23@...il.com,
        namhyung@...nel.org, jolsa@...hat.com,
        alexander.shishkin@...ux.intel.com, mark.rutland@....com,
        acme@...nel.org, dave@...olabs.net, dvhart@...radead.org,
        peterz@...radead.org, mingo@...hat.com, tglx@...utronix.de,
        atish.patra@....com, arnd@...db.de,
        Alistair Francis <alistair.francis@....com>
Subject: [PATCH v2 2/2] selftests: futex: Use a 64-bit time_t

From: Alistair Francis <alistair.francis@....com>

Convert the futex selftests to only use a 64-bit time_t. On 64-bit
architectures this isn't a functional change. On 32-bit architectures
we now only perform 64-bit time_t syscalls (__NR_futex_time64) and
use a struct timespec64.

This won't work on kernels before 5.1, but as perf is tied to the kernel
that's ok.

This allows the tests to run and pass on RISC-V 32-bit.

Signed-off-by: Alistair Francis <alistair.francis@....com>
---
 .../futex/functional/futex_requeue.c          |  2 +-
 .../futex/functional/futex_requeue_pi.c       | 10 ++---
 .../selftests/futex/functional/futex_wait.c   |  2 +-
 .../futex_wait_private_mapped_file.c          |  2 +-
 .../futex/functional/futex_wait_timeout.c     |  8 ++--
 .../futex/functional/futex_wait_wouldblock.c  |  2 +-
 .../selftests/futex/include/futextest.h       | 37 +++++++++++++++----
 7 files changed, 43 insertions(+), 20 deletions(-)

diff --git a/tools/testing/selftests/futex/functional/futex_requeue.c b/tools/testing/selftests/futex/functional/futex_requeue.c
index 51485be6eb2f1..f51aedffcd161 100644
--- a/tools/testing/selftests/futex/functional/futex_requeue.c
+++ b/tools/testing/selftests/futex/functional/futex_requeue.c
@@ -27,7 +27,7 @@ void usage(char *prog)
 
 void *waiterfn(void *arg)
 {
-	struct timespec to;
+	struct timespec64 to;
 
 	to.tv_sec = 0;
 	to.tv_nsec = timeout_ns;
diff --git a/tools/testing/selftests/futex/functional/futex_requeue_pi.c b/tools/testing/selftests/futex/functional/futex_requeue_pi.c
index 1ee5518ee6b7f..32d6ee554ec2e 100644
--- a/tools/testing/selftests/futex/functional/futex_requeue_pi.c
+++ b/tools/testing/selftests/futex/functional/futex_requeue_pi.c
@@ -48,7 +48,7 @@ static int locked;
 
 struct thread_arg {
 	long id;
-	struct timespec *timeout;
+	struct timespec64 *timeout;
 	int lock;
 	int ret;
 };
@@ -281,7 +281,7 @@ int unit_test(int broadcast, long lock, int third_party_owner, long timeout_ns)
 	struct thread_arg blocker_arg = THREAD_ARG_INITIALIZER;
 	struct thread_arg waker_arg = THREAD_ARG_INITIALIZER;
 	pthread_t waiter[THREAD_MAX], waker, blocker;
-	struct timespec ts, *tsp = NULL;
+	struct timespec64 ts, *tsp = NULL;
 	struct thread_arg args[THREAD_MAX];
 	int *waiter_ret;
 	int i, ret = RET_PASS;
@@ -290,12 +290,12 @@ int unit_test(int broadcast, long lock, int third_party_owner, long timeout_ns)
 		time_t secs;
 
 		info("timeout_ns = %ld\n", timeout_ns);
-		ret = clock_gettime(CLOCK_MONOTONIC, &ts);
+		ret = gettime64(CLOCK_MONOTONIC, &ts);
 		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_nsec = %ld\n", ts.tv_nsec);
+		info("ts.tv_sec  = %lld\n", ts.tv_sec);
+		info("ts.tv_nsec = %lld\n", ts.tv_nsec);
 		tsp = &ts;
 	}
 
diff --git a/tools/testing/selftests/futex/functional/futex_wait.c b/tools/testing/selftests/futex/functional/futex_wait.c
index 685140d9b93d2..d1c8a4212c74c 100644
--- a/tools/testing/selftests/futex/functional/futex_wait.c
+++ b/tools/testing/selftests/futex/functional/futex_wait.c
@@ -30,7 +30,7 @@ void usage(char *prog)
 
 static void *waiterfn(void *arg)
 {
-	struct timespec to;
+	struct timespec64 to;
 	unsigned int flags = 0;
 
 	if (arg)
diff --git a/tools/testing/selftests/futex/functional/futex_wait_private_mapped_file.c b/tools/testing/selftests/futex/functional/futex_wait_private_mapped_file.c
index fb4148f23fa37..5e84e136ad99e 100644
--- a/tools/testing/selftests/futex/functional/futex_wait_private_mapped_file.c
+++ b/tools/testing/selftests/futex/functional/futex_wait_private_mapped_file.c
@@ -38,7 +38,7 @@ futex_t val = 1;
 char pad2[PAGE_SZ] = {1};
 
 #define WAKE_WAIT_US 3000000
-struct timespec wait_timeout = { .tv_sec = 5, .tv_nsec = 0};
+struct timespec64 wait_timeout = { .tv_sec = 5, .tv_nsec = 0};
 
 void usage(char *prog)
 {
diff --git a/tools/testing/selftests/futex/functional/futex_wait_timeout.c b/tools/testing/selftests/futex/functional/futex_wait_timeout.c
index 1f8f6daaf1e70..86b1e847a0246 100644
--- a/tools/testing/selftests/futex/functional/futex_wait_timeout.c
+++ b/tools/testing/selftests/futex/functional/futex_wait_timeout.c
@@ -71,11 +71,11 @@ static void test_timeout(int res, int *ret, char *test_name, int err)
 /*
  * Calculate absolute timeout and correct overflow
  */
-static int futex_get_abs_timeout(clockid_t clockid, struct timespec *to,
+static int futex_get_abs_timeout(clockid_t clockid, struct timespec64 *to,
 				 long timeout_ns)
 {
-	if (clock_gettime(clockid, to)) {
-		error("clock_gettime failed\n", errno);
+	if (gettime64(clockid, to)) {
+		error("gettime64 failed\n", errno);
 		return errno;
 	}
 
@@ -93,7 +93,7 @@ int main(int argc, char *argv[])
 {
 	futex_t f1 = FUTEX_INITIALIZER;
 	int res, ret = RET_PASS;
-	struct timespec to;
+	struct timespec64 to;
 	pthread_t thread;
 	int c;
 
diff --git a/tools/testing/selftests/futex/functional/futex_wait_wouldblock.c b/tools/testing/selftests/futex/functional/futex_wait_wouldblock.c
index 0ae390ff81644..76faa664544d6 100644
--- a/tools/testing/selftests/futex/functional/futex_wait_wouldblock.c
+++ b/tools/testing/selftests/futex/functional/futex_wait_wouldblock.c
@@ -38,7 +38,7 @@ void usage(char *prog)
 
 int main(int argc, char *argv[])
 {
-	struct timespec to = {.tv_sec = 0, .tv_nsec = timeout_ns};
+	struct timespec64 to = {.tv_sec = 0, .tv_nsec = timeout_ns};
 	futex_t f1 = FUTEX_INITIALIZER;
 	int res, ret = RET_PASS;
 	int c;
diff --git a/tools/testing/selftests/futex/include/futextest.h b/tools/testing/selftests/futex/include/futextest.h
index ddbcfc9b7bac4..67ed97a455274 100644
--- a/tools/testing/selftests/futex/include/futextest.h
+++ b/tools/testing/selftests/futex/include/futextest.h
@@ -21,6 +21,7 @@
 #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
@@ -47,12 +48,14 @@ typedef volatile u_int32_t futex_t;
 					 FUTEX_PRIVATE_FLAG)
 #endif
 
+#define timespec64 __kernel_timespec
+
 /**
  * futex() - SYS_futex syscall wrapper
  * @uaddr:	address of first futex
  * @op:		futex op code
  * @val:	typically expected value of uaddr, but varies by op
- * @timeout:	typically an absolute struct timespec (except where noted
+ * @timeout:	typically an absolute struct timespec64 (except where noted
  *              otherwise). Overloaded by some ops
  * @uaddr2:	address of second futex for some ops\
  * @val3:	varies by op
@@ -67,15 +70,35 @@ typedef volatile u_int32_t futex_t;
  * These argument descriptions are the defaults for all
  * like-named arguments in the following wrappers except where noted below.
  */
-#define futex(uaddr, op, val, timeout, uaddr2, val3, opflags) \
-	syscall(SYS_futex, uaddr, op | opflags, val, timeout, uaddr2, val3)
+/**
+ * We only support 64-bit time_t for the timeout.
+ * On 64-bit architectures we can use __NR_futex
+ * On 32-bit architectures we use __NR_futex_time64. This only works on kernel
+ * versions 5.1+.
+ */
+#if __BITS_PER_LONG == 64
+# define futex(uaddr, op, val, timeout, uaddr2, val3, opflags) \
+	syscall(__NR_futex, uaddr, op | opflags, val, timeout, uaddr2, val3)
+#else
+# define futex(uaddr, op, val, timeout, uaddr2, val3, opflags) \
+	syscall(__NR_futex_time64, uaddr, op | opflags, val, timeout, uaddr2, val3)
+#endif
+
+static inline int gettime64(clock_t clockid, struct timespec64 *tv)
+{
+#if __BITS_PER_LONG == 64 || (defined(__x86_64__) && defined(__ILP32__))
+	return syscall(__NR_clock_gettime, clockid, tv);
+#else
+	return syscall(__NR_clock_gettime64, clockid, tv);
+#endif
+}
 
 /**
  * futex_wait() - block on uaddr with optional timeout
  * @timeout:	relative timeout
  */
 static inline int
-futex_wait(futex_t *uaddr, futex_t val, struct timespec *timeout, int opflags)
+futex_wait(futex_t *uaddr, futex_t val, struct timespec64 *timeout, int opflags)
 {
 	return futex(uaddr, FUTEX_WAIT, val, timeout, NULL, 0, opflags);
 }
@@ -95,7 +118,7 @@ futex_wake(futex_t *uaddr, int nr_wake, int opflags)
  * @bitset:	bitset to be used with futex_wake_bitset
  */
 static inline int
-futex_wait_bitset(futex_t *uaddr, futex_t val, struct timespec *timeout,
+futex_wait_bitset(futex_t *uaddr, futex_t val, struct timespec64 *timeout,
 		  u_int32_t bitset, int opflags)
 {
 	return futex(uaddr, FUTEX_WAIT_BITSET, val, timeout, NULL, bitset,
@@ -118,7 +141,7 @@ futex_wake_bitset(futex_t *uaddr, int nr_wake, u_int32_t bitset, int opflags)
  * @detect:	whether (1) or not (0) to perform deadlock detection
  */
 static inline int
-futex_lock_pi(futex_t *uaddr, struct timespec *timeout, int detect,
+futex_lock_pi(futex_t *uaddr, struct timespec64 *timeout, int detect,
 	      int opflags)
 {
 	return futex(uaddr, FUTEX_LOCK_PI, detect, timeout, NULL, 0, opflags);
@@ -183,7 +206,7 @@ futex_cmp_requeue(futex_t *uaddr, futex_t val, futex_t *uaddr2, int nr_wake,
  */
 static inline int
 futex_wait_requeue_pi(futex_t *uaddr, futex_t val, futex_t *uaddr2,
-		      struct timespec *timeout, int opflags)
+		      struct timespec64 *timeout, int opflags)
 {
 	return futex(uaddr, FUTEX_WAIT_REQUEUE_PI, val, timeout, uaddr2, 0,
 		     opflags);
-- 
2.31.1

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