netxen_collect_minidump() evidently just wants to get a monotonic
timestamp. Using jiffies_to_timespec(jiffies, &ts) is not
appropriate here, since it will overflow after 2^32 jiffies,
which may be as short as 49 days of uptime.
ktime_get_seconds() is the correct interface here.
Signed-off-by: Arnd Bergmann <arnd(a)arndb.de>
---
drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c b/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c
index 0a66389c06c2..1cd39c9a0345 100644
--- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c
+++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c
@@ -2502,12 +2502,10 @@ netxen_collect_minidump(struct netxen_adapter *adapter)
{
int ret = 0;
struct netxen_minidump_template_hdr *hdr;
- struct timespec val;
hdr = (struct netxen_minidump_template_hdr *)
adapter->mdump.md_template;
hdr->driver_capture_mask = adapter->mdump.md_capture_mask;
- jiffies_to_timespec(jiffies, &val);
- hdr->driver_timestamp = (u32) val.tv_sec;
+ hdr->driver_timestamp = ktime_get_seconds();
hdr->driver_info_word2 = adapter->fw_version;
hdr->driver_info_word3 = NXRD32(adapter, CRB_DRIVER_VERSION);
ret = netxen_parse_md_template(adapter);
--
2.9.0
There is no need to go through an intermediate timespec to convert
to ktime_t when we just want a simple multiplication. This gets
rid of one of the few users of jiffies_to_timespec, which I
hope to remove as part of the y2038 cleanup.
Signed-off-by: Arnd Bergmann <arnd(a)arndb.de>
---
drivers/scsi/scsi_debug.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index e4f037f0f38b..df7e9db44d44 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -4085,10 +4085,7 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
ktime_t kt;
if (delta_jiff > 0) {
- struct timespec ts;
-
- jiffies_to_timespec(delta_jiff, &ts);
- kt = ktime_set(ts.tv_sec, ts.tv_nsec);
+ kt = ns_to_ktime((u64)delta_jiff * (NSEC_PER_SEC / HZ));
} else
kt = sdebug_ndelay;
if (NULL == sd_dp) {
--
2.9.0
The memory mapped packet socket data structure in version 1 through 3
all contain 32-bit second values for the packet time stamps, which makes
them suffer from the overflow of time_t in y2038 or y2106 (depending
on whether user space interprets the value as signed or unsigned).
The implementation uses the deprecated getnstimeofday() function.
In order to get rid of that, this changes the code to use
ktime_get_real_ts64() as a replacement, documenting the nature of the
overflow. As long as the user applications treat the timestamps as
unsigned, or only use the difference between timestamps, they are
fine, and changing the timestamps to 64-bit wouldn't require a more
invasive user space API change.
Note: a lot of other APIs suffer from incompatible structures when
time_t gets redefined to 64-bit in 32-bit user space, but this one
does not.
Signed-off-by: Arnd Bergmann <arnd(a)arndb.de>
---
net/packet/af_packet.c | 27 +++++++++++++++++----------
1 file changed, 17 insertions(+), 10 deletions(-)
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 737092ca9b4e..7432c6699818 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -439,17 +439,17 @@ static int __packet_get_status(struct packet_sock *po, void *frame)
}
}
-static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec *ts,
+static __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec64 *ts,
unsigned int flags)
{
struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
if (shhwtstamps &&
(flags & SOF_TIMESTAMPING_RAW_HARDWARE) &&
- ktime_to_timespec_cond(shhwtstamps->hwtstamp, ts))
+ ktime_to_timespec64_cond(shhwtstamps->hwtstamp, ts))
return TP_STATUS_TS_RAW_HARDWARE;
- if (ktime_to_timespec_cond(skb->tstamp, ts))
+ if (ktime_to_timespec64_cond(skb->tstamp, ts))
return TP_STATUS_TS_SOFTWARE;
return 0;
@@ -459,13 +459,20 @@ static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame,
struct sk_buff *skb)
{
union tpacket_uhdr h;
- struct timespec ts;
+ struct timespec64 ts;
__u32 ts_status;
if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
return 0;
h.raw = frame;
+ /*
+ * versions 1 through 3 overflow the timestamps in y2106, since they
+ * all store the seconds in a 32-bit unsigned integer.
+ * If we create a version 4, that should have a 64-bit timestamp,
+ * either 64-bit seconds + 32-bit nanoseconds, or just 64-bit
+ * nanoseconds.
+ */
switch (po->tp_version) {
case TPACKET_V1:
h.h1->tp_sec = ts.tv_sec;
@@ -805,8 +812,8 @@ static void prb_close_block(struct tpacket_kbdq_core *pkc1,
* It shouldn't really happen as we don't close empty
* blocks. See prb_retire_rx_blk_timer_expired().
*/
- struct timespec ts;
- getnstimeofday(&ts);
+ struct timespec64 ts;
+ ktime_get_real_ts64(&ts);
h1->ts_last_pkt.ts_sec = ts.tv_sec;
h1->ts_last_pkt.ts_nsec = ts.tv_nsec;
}
@@ -836,7 +843,7 @@ static void prb_thaw_queue(struct tpacket_kbdq_core *pkc)
static void prb_open_block(struct tpacket_kbdq_core *pkc1,
struct tpacket_block_desc *pbd1)
{
- struct timespec ts;
+ struct timespec64 ts;
struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;
smp_rmb();
@@ -849,7 +856,7 @@ static void prb_open_block(struct tpacket_kbdq_core *pkc1,
BLOCK_NUM_PKTS(pbd1) = 0;
BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
- getnstimeofday(&ts);
+ ktime_get_real_ts64(&ts);
h1->ts_first_pkt.ts_sec = ts.tv_sec;
h1->ts_first_pkt.ts_nsec = ts.tv_nsec;
@@ -2184,7 +2191,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
unsigned long status = TP_STATUS_USER;
unsigned short macoff, netoff, hdrlen;
struct sk_buff *copy_skb = NULL;
- struct timespec ts;
+ struct timespec64 ts;
__u32 ts_status;
bool is_drop_n_account = false;
bool do_vnet = false;
@@ -2312,7 +2319,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
- getnstimeofday(&ts);
+ ktime_get_real_ts64(&ts);
status |= ts_status;
--
2.9.0
Dealing with 'struct timeval' users in the y2038 series is a bit tricky:
We have two definitions of timeval that are visible to user space,
one comes from glibc (or some other C library), the other comes from
linux/time.h. The kernel copy is what we want to be used for a number of
structures defined by the kernel itself, e.g. elf_prstatus (used it core
dumps), sysinfo and rusage (used in system calls). These generally tend
to be used for passing time intervals rather than absolute (epoch-based)
times, so they do not suffer from the y2038 overflow. Some of them
could be changed to use 64-bit timestamps by creating new system calls,
others like the core files cannot easily be changed.
An application using these interfaces likely also uses gettimeofday()
or other interfaces that use absolute times, and pass 'struct timeval'
pointers directly into kernel interfaces, so glibc must redefine their
timeval based on a 64-bit time_t when they introduce their y2038-safe
interfaces.
The only reasonable way forward I see is to remove the 'timeval'
definion from the kernel's uapi headers, and change the interfaces that
we do not want to (or cannot) duplicate for 64-bit times to use a new
__kernel_old_timeval definition instead. This type should be avoided
for all new interfaces (those can use 64-bit nanoseconds, or the 64-bit
version of timespec instead), and should be used with great care when
converting existing interfaces from timeval, to be sure they don't suffer
from the y2038 overflow, and only with consensus for the particular user
that using __kernel_old_timeval is better than moving to a 64-bit based
interface. The structure name is intentionally chosen to not conflict
with user space types, and to be ugly enough to discourage its use.
Note that ioctl based interfaces that pass a bare 'timeval' pointer
cannot change to '__kernel_old_timeval' because the user space source
code refers to 'timeval' instead, and we don't want to modify the user
space sources if possible. However, any application that relies on a
structure to contain an embedded 'timeval' (e.g. by passing a pointer
to the member into a function call that expects a timeval pointer) is
broken when that structure gets converted to __kernel_old_timeval. I
don't see any way around that, and we have to rely on the compiler to
produce a warning or compile failure that will alert users when they
recompile their sources against a new libc.
Signed-off-by: Arnd Bergmann <arnd(a)arndb.de>
---
include/linux/time32.h | 1 +
include/uapi/linux/time.h | 12 ++++++++++++
kernel/time/time.c | 12 ++++++++++++
3 files changed, 25 insertions(+)
diff --git a/include/linux/time32.h b/include/linux/time32.h
index 100411c979be..378c75d9a83c 100644
--- a/include/linux/time32.h
+++ b/include/linux/time32.h
@@ -205,5 +205,6 @@ static inline s64 timeval_to_ns(const struct timeval *tv)
* Returns the timeval representation of the nsec parameter.
*/
extern struct timeval ns_to_timeval(const s64 nsec);
+extern struct __kernel_old_timeval ns_to_kernel_old_timeval(const s64 nsec);
#endif
diff --git a/include/uapi/linux/time.h b/include/uapi/linux/time.h
index 0ad4510884b0..30aa734135ad 100644
--- a/include/uapi/linux/time.h
+++ b/include/uapi/linux/time.h
@@ -50,6 +50,18 @@ struct __kernel_timespec {
#endif
/*
+ * legacy timeval structure, only embedded in structures that
+ * traditionally used 'timeval' to pass time intervals (not absolute
+ * times). Do not add new users. If user space fails to compile
+ * here, this is probably because it is not y2038 safe and needs to
+ * be changed to use another interface.
+ */
+struct __kernel_old_timeval {
+ __kernel_long_t tv_sec; /* seconds */
+ __kernel_long_t tv_usec; /* seconds */
+};
+
+/*
* The IDs of the various system clocks (for POSIX.1b interval timers):
*/
#define CLOCK_REALTIME 0
diff --git a/kernel/time/time.c b/kernel/time/time.c
index 518b56b17147..92002257f083 100644
--- a/kernel/time/time.c
+++ b/kernel/time/time.c
@@ -486,6 +486,18 @@ struct timeval ns_to_timeval(const s64 nsec)
}
EXPORT_SYMBOL(ns_to_timeval);
+struct __kernel_old_timeval ns_to_kernel_old_timeval(const s64 nsec)
+{
+ struct timespec64 ts = ns_to_timespec64(nsec);
+ struct __kernel_old_timeval tv;
+
+ tv.tv_sec = ts.tv_sec;
+ tv.tv_usec = (suseconds_t) ts.tv_nsec / 1000;
+
+ return tv;
+}
+EXPORT_SYMBOL(ns_to_kernel_old_timeval);
+
/**
* set_normalized_timespec - set timespec sec and nsec parts and normalize
*
--
2.9.0
getnstimeofday() is deprecated, so I'm converting this to use
ktime_get_real_ts64() as a safe replacement. I considered using
ktime_get_real() instead, but since the algorithm here depends
on the exact timing, I decided to introduce fewer changes
and leave the code that determines the nanoseconds since the
last seconds wrap untouched.
It's not entirely clear to me whether we should also change the
time base to CLOCK_BOOTTIME or CLOCK_TAI. With boottime, we
would be independent of changes due to settimeofday() and only
see the speed adjustment from the upstream clock source, with
the downside of having the signal be at an arbirary offset
from the start of the UTC second signal. With CLOCK_TAI, we
would use the same offset from the UTC second as before and
still suffer from settimeofday() adjustments, but would be
less confused during leap seconds.
Both boottime and tai only offer usable (i.e. avoiding ktime_t
to timespec64 conversion) interfaces for ktime_t though, so
either way, changing it wouldn't take significantly more work.
CLOCK_MONOTONIC could be used with ktime_get_ts64(), but would
lose synchronization across a suspend/resume cycle, which seems
worse.
Signed-off-by: Arnd Bergmann <arnd(a)arndb.de>
---
drivers/pps/generators/pps_gen_parport.c | 40 ++++++++++++++++----------------
1 file changed, 20 insertions(+), 20 deletions(-)
diff --git a/drivers/pps/generators/pps_gen_parport.c b/drivers/pps/generators/pps_gen_parport.c
index dcd39fba6ddd..51cfde6afffd 100644
--- a/drivers/pps/generators/pps_gen_parport.c
+++ b/drivers/pps/generators/pps_gen_parport.c
@@ -70,7 +70,7 @@ static long hrtimer_error = SAFETY_INTERVAL;
/* the kernel hrtimer event */
static enum hrtimer_restart hrtimer_event(struct hrtimer *timer)
{
- struct timespec expire_time, ts1, ts2, ts3, dts;
+ struct timespec64 expire_time, ts1, ts2, ts3, dts;
struct pps_generator_pp *dev;
struct parport *port;
long lim, delta;
@@ -78,7 +78,7 @@ static enum hrtimer_restart hrtimer_event(struct hrtimer *timer)
/* We have to disable interrupts here. The idea is to prevent
* other interrupts on the same processor to introduce random
- * lags while polling the clock. getnstimeofday() takes <1us on
+ * lags while polling the clock. ktime_get_real_ts64() takes <1us on
* most machines while other interrupt handlers can take much
* more potentially.
*
@@ -88,22 +88,22 @@ static enum hrtimer_restart hrtimer_event(struct hrtimer *timer)
local_irq_save(flags);
/* first of all we get the time stamp... */
- getnstimeofday(&ts1);
- expire_time = ktime_to_timespec(hrtimer_get_softexpires(timer));
+ ktime_get_real_ts64(&ts1);
+ expire_time = ktime_to_timespec64(hrtimer_get_softexpires(timer));
dev = container_of(timer, struct pps_generator_pp, timer);
lim = NSEC_PER_SEC - send_delay - dev->port_write_time;
/* check if we are late */
if (expire_time.tv_sec != ts1.tv_sec || ts1.tv_nsec > lim) {
local_irq_restore(flags);
- pr_err("we are late this time %ld.%09ld\n",
- ts1.tv_sec, ts1.tv_nsec);
+ pr_err("we are late this time %lld.%09ld\n",
+ (s64)ts1.tv_sec, ts1.tv_nsec);
goto done;
}
/* busy loop until the time is right for an assert edge */
do {
- getnstimeofday(&ts2);
+ ktime_get_real_ts64(&ts2);
} while (expire_time.tv_sec == ts2.tv_sec && ts2.tv_nsec < lim);
/* set the signal */
@@ -113,25 +113,25 @@ static enum hrtimer_restart hrtimer_event(struct hrtimer *timer)
/* busy loop until the time is right for a clear edge */
lim = NSEC_PER_SEC - dev->port_write_time;
do {
- getnstimeofday(&ts2);
+ ktime_get_real_ts64(&ts2);
} while (expire_time.tv_sec == ts2.tv_sec && ts2.tv_nsec < lim);
/* unset the signal */
port->ops->write_control(port, NO_SIGNAL);
- getnstimeofday(&ts3);
+ ktime_get_real_ts64(&ts3);
local_irq_restore(flags);
/* update calibrated port write time */
- dts = timespec_sub(ts3, ts2);
+ dts = timespec64_sub(ts3, ts2);
dev->port_write_time =
- (dev->port_write_time + timespec_to_ns(&dts)) >> 1;
+ (dev->port_write_time + timespec64_to_ns(&dts)) >> 1;
done:
/* update calibrated hrtimer error */
- dts = timespec_sub(ts1, expire_time);
- delta = timespec_to_ns(&dts);
+ dts = timespec64_sub(ts1, expire_time);
+ delta = timespec64_to_ns(&dts);
/* If the new error value is bigger then the old, use the new
* value, if not then slowly move towards the new value. This
* way it should be safe in bad conditions and efficient in
@@ -161,17 +161,17 @@ static void calibrate_port(struct pps_generator_pp *dev)
long acc = 0;
for (i = 0; i < (1 << PORT_NTESTS_SHIFT); i++) {
- struct timespec a, b;
+ struct timespec64 a, b;
unsigned long irq_flags;
local_irq_save(irq_flags);
- getnstimeofday(&a);
+ ktime_get_real_ts64(&a);
port->ops->write_control(port, NO_SIGNAL);
- getnstimeofday(&b);
+ ktime_get_real_ts64(&b);
local_irq_restore(irq_flags);
- b = timespec_sub(b, a);
- acc += timespec_to_ns(&b);
+ b = timespec64_sub(b, a);
+ acc += timespec64_to_ns(&b);
}
dev->port_write_time = acc >> PORT_NTESTS_SHIFT;
@@ -180,9 +180,9 @@ static void calibrate_port(struct pps_generator_pp *dev)
static inline ktime_t next_intr_time(struct pps_generator_pp *dev)
{
- struct timespec ts;
+ struct timespec64 ts;
- getnstimeofday(&ts);
+ ktime_get_real_ts64(&ts);
return ktime_set(ts.tv_sec +
((ts.tv_nsec > 990 * NSEC_PER_MSEC) ? 1 : 0),
--
2.9.0
