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authorLinus Torvalds <torvalds@linux-foundation.org>2018-06-04 20:27:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-06-04 20:27:54 -0700
commit0bbcce5d1ef3f771a349896f1c7574d20dc6f4bd (patch)
tree8a26c5f63eac55cbedff506bba22d32f8669fd5c /kernel
parent0ef283d4c7808cb264f904de5e29a0b661747fc4 (diff)
parente45e778f078efaac085e50366fe06d7b83c8b881 (diff)
downloadlinux-0bbcce5d1ef3f771a349896f1c7574d20dc6f4bd.tar.bz2
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timers and timekeeping updates from Thomas Gleixner: - Core infrastucture work for Y2038 to address the COMPAT interfaces: + Add a new Y2038 safe __kernel_timespec and use it in the core code + Introduce config switches which allow to control the various compat mechanisms + Use the new config switch in the posix timer code to control the 32bit compat syscall implementation. - Prevent bogus selection of CPU local clocksources which causes an endless reselection loop - Remove the extra kthread in the clocksource code which has no value and just adds another level of indirection - The usual bunch of trivial updates, cleanups and fixlets all over the place - More SPDX conversions * 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits) clocksource/drivers/mxs_timer: Switch to SPDX identifier clocksource/drivers/timer-imx-tpm: Switch to SPDX identifier clocksource/drivers/timer-imx-gpt: Switch to SPDX identifier clocksource/drivers/timer-imx-gpt: Remove outdated file path clocksource/drivers/arc_timer: Add comments about locking while read GFRC clocksource/drivers/mips-gic-timer: Add pr_fmt and reword pr_* messages clocksource/drivers/sprd: Fix Kconfig dependency clocksource: Move inline keyword to the beginning of function declarations timer_list: Remove unused function pointer typedef timers: Adjust a kernel-doc comment tick: Prefer a lower rating device only if it's CPU local device clocksource: Remove kthread time: Change nanosleep to safe __kernel_* types time: Change types to new y2038 safe __kernel_* types time: Fix get_timespec64() for y2038 safe compat interfaces time: Add new y2038 safe __kernel_timespec posix-timers: Make compat syscalls depend on CONFIG_COMPAT_32BIT_TIME time: Introduce CONFIG_COMPAT_32BIT_TIME time: Introduce CONFIG_64BIT_TIME in architectures compat: Enable compat_get/put_timespec64 always ...
Diffstat (limited to 'kernel')
-rw-r--r--kernel/compat.c52
-rw-r--r--kernel/time/clocksource.c35
-rw-r--r--kernel/time/hrtimer.c10
-rw-r--r--kernel/time/posix-stubs.c12
-rw-r--r--kernel/time/posix-timers.c24
-rw-r--r--kernel/time/tick-common.c3
-rw-r--r--kernel/time/time.c58
-rw-r--r--kernel/time/timer.c14
-rw-r--r--kernel/time/timer_list.c2
9 files changed, 114 insertions, 96 deletions
diff --git a/kernel/compat.c b/kernel/compat.c
index 92d8c98c0f57..702aa846ddac 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -121,50 +121,6 @@ static int __compat_put_timespec(const struct timespec *ts, struct compat_timesp
__put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
}
-static int __compat_get_timespec64(struct timespec64 *ts64,
- const struct compat_timespec __user *cts)
-{
- struct compat_timespec ts;
- int ret;
-
- ret = copy_from_user(&ts, cts, sizeof(ts));
- if (ret)
- return -EFAULT;
-
- ts64->tv_sec = ts.tv_sec;
- ts64->tv_nsec = ts.tv_nsec;
-
- return 0;
-}
-
-static int __compat_put_timespec64(const struct timespec64 *ts64,
- struct compat_timespec __user *cts)
-{
- struct compat_timespec ts = {
- .tv_sec = ts64->tv_sec,
- .tv_nsec = ts64->tv_nsec
- };
- return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0;
-}
-
-int compat_get_timespec64(struct timespec64 *ts, const void __user *uts)
-{
- if (COMPAT_USE_64BIT_TIME)
- return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
- else
- return __compat_get_timespec64(ts, uts);
-}
-EXPORT_SYMBOL_GPL(compat_get_timespec64);
-
-int compat_put_timespec64(const struct timespec64 *ts, void __user *uts)
-{
- if (COMPAT_USE_64BIT_TIME)
- return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
- else
- return __compat_put_timespec64(ts, uts);
-}
-EXPORT_SYMBOL_GPL(compat_put_timespec64);
-
int compat_get_timeval(struct timeval *tv, const void __user *utv)
{
if (COMPAT_USE_64BIT_TIME)
@@ -368,6 +324,14 @@ COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
return ret;
}
+/* Todo: Delete these extern declarations when get/put_compat_itimerspec64()
+ * are moved to kernel/time/time.c .
+ */
+extern int __compat_get_timespec64(struct timespec64 *ts64,
+ const struct compat_timespec __user *cts);
+extern int __compat_put_timespec64(const struct timespec64 *ts64,
+ struct compat_timespec __user *cts);
+
int get_compat_itimerspec64(struct itimerspec64 *its,
const struct compat_itimerspec __user *uits)
{
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 84f37420fcf5..f89a78e2792b 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -129,31 +129,19 @@ static void inline clocksource_watchdog_unlock(unsigned long *flags)
spin_unlock_irqrestore(&watchdog_lock, *flags);
}
-static int clocksource_watchdog_kthread(void *data);
-static void __clocksource_change_rating(struct clocksource *cs, int rating);
-
/*
* Interval: 0.5sec Threshold: 0.0625s
*/
#define WATCHDOG_INTERVAL (HZ >> 1)
#define WATCHDOG_THRESHOLD (NSEC_PER_SEC >> 4)
-static void clocksource_watchdog_work(struct work_struct *work)
-{
- /*
- * If kthread_run fails the next watchdog scan over the
- * watchdog_list will find the unstable clock again.
- */
- kthread_run(clocksource_watchdog_kthread, NULL, "kwatchdog");
-}
-
static void __clocksource_unstable(struct clocksource *cs)
{
cs->flags &= ~(CLOCK_SOURCE_VALID_FOR_HRES | CLOCK_SOURCE_WATCHDOG);
cs->flags |= CLOCK_SOURCE_UNSTABLE;
/*
- * If the clocksource is registered clocksource_watchdog_kthread() will
+ * If the clocksource is registered clocksource_watchdog_work() will
* re-rate and re-select.
*/
if (list_empty(&cs->list)) {
@@ -164,7 +152,7 @@ static void __clocksource_unstable(struct clocksource *cs)
if (cs->mark_unstable)
cs->mark_unstable(cs);
- /* kick clocksource_watchdog_kthread() */
+ /* kick clocksource_watchdog_work() */
if (finished_booting)
schedule_work(&watchdog_work);
}
@@ -174,7 +162,7 @@ static void __clocksource_unstable(struct clocksource *cs)
* @cs: clocksource to be marked unstable
*
* This function is called by the x86 TSC code to mark clocksources as unstable;
- * it defers demotion and re-selection to a kthread.
+ * it defers demotion and re-selection to a work.
*/
void clocksource_mark_unstable(struct clocksource *cs)
{
@@ -399,7 +387,9 @@ static void clocksource_dequeue_watchdog(struct clocksource *cs)
}
}
-static int __clocksource_watchdog_kthread(void)
+static void __clocksource_change_rating(struct clocksource *cs, int rating);
+
+static int __clocksource_watchdog_work(void)
{
struct clocksource *cs, *tmp;
unsigned long flags;
@@ -424,13 +414,12 @@ static int __clocksource_watchdog_kthread(void)
return select;
}
-static int clocksource_watchdog_kthread(void *data)
+static void clocksource_watchdog_work(struct work_struct *work)
{
mutex_lock(&clocksource_mutex);
- if (__clocksource_watchdog_kthread())
+ if (__clocksource_watchdog_work())
clocksource_select();
mutex_unlock(&clocksource_mutex);
- return 0;
}
static bool clocksource_is_watchdog(struct clocksource *cs)
@@ -449,12 +438,12 @@ static void clocksource_enqueue_watchdog(struct clocksource *cs)
static void clocksource_select_watchdog(bool fallback) { }
static inline void clocksource_dequeue_watchdog(struct clocksource *cs) { }
static inline void clocksource_resume_watchdog(void) { }
-static inline int __clocksource_watchdog_kthread(void) { return 0; }
+static inline int __clocksource_watchdog_work(void) { return 0; }
static bool clocksource_is_watchdog(struct clocksource *cs) { return false; }
void clocksource_mark_unstable(struct clocksource *cs) { }
-static void inline clocksource_watchdog_lock(unsigned long *flags) { }
-static void inline clocksource_watchdog_unlock(unsigned long *flags) { }
+static inline void clocksource_watchdog_lock(unsigned long *flags) { }
+static inline void clocksource_watchdog_unlock(unsigned long *flags) { }
#endif /* CONFIG_CLOCKSOURCE_WATCHDOG */
@@ -683,7 +672,7 @@ static int __init clocksource_done_booting(void)
/*
* Run the watchdog first to eliminate unstable clock sources
*/
- __clocksource_watchdog_kthread();
+ __clocksource_watchdog_work();
clocksource_select();
mutex_unlock(&clocksource_mutex);
return 0;
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 14e858753d76..055a4a728c00 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1759,8 +1759,10 @@ out:
return ret;
}
-SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp,
- struct timespec __user *, rmtp)
+#if !defined(CONFIG_64BIT_TIME) || defined(CONFIG_64BIT)
+
+SYSCALL_DEFINE2(nanosleep, struct __kernel_timespec __user *, rqtp,
+ struct __kernel_timespec __user *, rmtp)
{
struct timespec64 tu;
@@ -1775,7 +1777,9 @@ SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp,
return hrtimer_nanosleep(&tu, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
}
-#ifdef CONFIG_COMPAT
+#endif
+
+#ifdef CONFIG_COMPAT_32BIT_TIME
COMPAT_SYSCALL_DEFINE2(nanosleep, struct compat_timespec __user *, rqtp,
struct compat_timespec __user *, rmtp)
diff --git a/kernel/time/posix-stubs.c b/kernel/time/posix-stubs.c
index 69a937c3cd81..26aa9569e24a 100644
--- a/kernel/time/posix-stubs.c
+++ b/kernel/time/posix-stubs.c
@@ -59,7 +59,7 @@ SYS_NI(alarm);
*/
SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
- const struct timespec __user *, tp)
+ const struct __kernel_timespec __user *, tp)
{
struct timespec64 new_tp;
@@ -90,7 +90,7 @@ int do_clock_gettime(clockid_t which_clock, struct timespec64 *tp)
return 0;
}
SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
- struct timespec __user *, tp)
+ struct __kernel_timespec __user *, tp)
{
int ret;
struct timespec64 kernel_tp;
@@ -104,7 +104,7 @@ SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
return 0;
}
-SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct timespec __user *, tp)
+SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct __kernel_timespec __user *, tp)
{
struct timespec64 rtn_tp = {
.tv_sec = 0,
@@ -124,8 +124,8 @@ SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct timespec __us
}
SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
- const struct timespec __user *, rqtp,
- struct timespec __user *, rmtp)
+ const struct __kernel_timespec __user *, rqtp,
+ struct __kernel_timespec __user *, rmtp)
{
struct timespec64 t;
@@ -158,7 +158,9 @@ COMPAT_SYS_NI(timer_settime);
COMPAT_SYS_NI(timer_gettime);
COMPAT_SYS_NI(getitimer);
COMPAT_SYS_NI(setitimer);
+#endif
+#ifdef CONFIG_COMPAT_32BIT_TIME
COMPAT_SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
struct compat_timespec __user *, tp)
{
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 10b7186d0638..e08ce3f27447 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -1040,7 +1040,7 @@ void exit_itimers(struct signal_struct *sig)
}
SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
- const struct timespec __user *, tp)
+ const struct __kernel_timespec __user *, tp)
{
const struct k_clock *kc = clockid_to_kclock(which_clock);
struct timespec64 new_tp;
@@ -1055,7 +1055,7 @@ SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
}
SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
- struct timespec __user *,tp)
+ struct __kernel_timespec __user *, tp)
{
const struct k_clock *kc = clockid_to_kclock(which_clock);
struct timespec64 kernel_tp;
@@ -1096,7 +1096,7 @@ SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock,
}
SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock,
- struct timespec __user *, tp)
+ struct __kernel_timespec __user *, tp)
{
const struct k_clock *kc = clockid_to_kclock(which_clock);
struct timespec64 rtn_tp;
@@ -1113,7 +1113,7 @@ SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock,
return error;
}
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_COMPAT_32BIT_TIME
COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock,
struct compat_timespec __user *, tp)
@@ -1148,6 +1148,10 @@ COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
return err;
}
+#endif
+
+#ifdef CONFIG_COMPAT
+
COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
struct compat_timex __user *, utp)
{
@@ -1172,6 +1176,10 @@ COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
return err;
}
+#endif
+
+#ifdef CONFIG_COMPAT_32BIT_TIME
+
COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
struct compat_timespec __user *, tp)
{
@@ -1203,8 +1211,8 @@ static int common_nsleep(const clockid_t which_clock, int flags,
}
SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
- const struct timespec __user *, rqtp,
- struct timespec __user *, rmtp)
+ const struct __kernel_timespec __user *, rqtp,
+ struct __kernel_timespec __user *, rmtp)
{
const struct k_clock *kc = clockid_to_kclock(which_clock);
struct timespec64 t;
@@ -1227,7 +1235,8 @@ SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
return kc->nsleep(which_clock, flags, &t);
}
-#ifdef CONFIG_COMPAT
+#ifdef CONFIG_COMPAT_32BIT_TIME
+
COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
struct compat_timespec __user *, rqtp,
struct compat_timespec __user *, rmtp)
@@ -1252,6 +1261,7 @@ COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
return kc->nsleep(which_clock, flags, &t);
}
+
#endif
static const struct k_clock clock_realtime = {
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index 49edc1c4f3e6..78e598334007 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -277,7 +277,8 @@ static bool tick_check_preferred(struct clock_event_device *curdev,
*/
return !curdev ||
newdev->rating > curdev->rating ||
- !cpumask_equal(curdev->cpumask, newdev->cpumask);
+ (!cpumask_equal(curdev->cpumask, newdev->cpumask) &&
+ !tick_check_percpu(curdev, newdev, smp_processor_id()));
}
/*
diff --git a/kernel/time/time.c b/kernel/time/time.c
index 3044d48ebe56..ccd751e95fcb 100644
--- a/kernel/time/time.c
+++ b/kernel/time/time.c
@@ -853,9 +853,9 @@ struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
}
int get_timespec64(struct timespec64 *ts,
- const struct timespec __user *uts)
+ const struct __kernel_timespec __user *uts)
{
- struct timespec kts;
+ struct __kernel_timespec kts;
int ret;
ret = copy_from_user(&kts, uts, sizeof(kts));
@@ -863,6 +863,11 @@ int get_timespec64(struct timespec64 *ts,
return -EFAULT;
ts->tv_sec = kts.tv_sec;
+
+ /* Zero out the padding for 32 bit systems or in compat mode */
+ if (IS_ENABLED(CONFIG_64BIT_TIME) && (!IS_ENABLED(CONFIG_64BIT) || in_compat_syscall()))
+ kts.tv_nsec &= 0xFFFFFFFFUL;
+
ts->tv_nsec = kts.tv_nsec;
return 0;
@@ -870,16 +875,61 @@ int get_timespec64(struct timespec64 *ts,
EXPORT_SYMBOL_GPL(get_timespec64);
int put_timespec64(const struct timespec64 *ts,
- struct timespec __user *uts)
+ struct __kernel_timespec __user *uts)
{
- struct timespec kts = {
+ struct __kernel_timespec kts = {
.tv_sec = ts->tv_sec,
.tv_nsec = ts->tv_nsec
};
+
return copy_to_user(uts, &kts, sizeof(kts)) ? -EFAULT : 0;
}
EXPORT_SYMBOL_GPL(put_timespec64);
+int __compat_get_timespec64(struct timespec64 *ts64,
+ const struct compat_timespec __user *cts)
+{
+ struct compat_timespec ts;
+ int ret;
+
+ ret = copy_from_user(&ts, cts, sizeof(ts));
+ if (ret)
+ return -EFAULT;
+
+ ts64->tv_sec = ts.tv_sec;
+ ts64->tv_nsec = ts.tv_nsec;
+
+ return 0;
+}
+
+int __compat_put_timespec64(const struct timespec64 *ts64,
+ struct compat_timespec __user *cts)
+{
+ struct compat_timespec ts = {
+ .tv_sec = ts64->tv_sec,
+ .tv_nsec = ts64->tv_nsec
+ };
+ return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0;
+}
+
+int compat_get_timespec64(struct timespec64 *ts, const void __user *uts)
+{
+ if (COMPAT_USE_64BIT_TIME)
+ return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
+ else
+ return __compat_get_timespec64(ts, uts);
+}
+EXPORT_SYMBOL_GPL(compat_get_timespec64);
+
+int compat_put_timespec64(const struct timespec64 *ts, void __user *uts)
+{
+ if (COMPAT_USE_64BIT_TIME)
+ return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
+ else
+ return __compat_put_timespec64(ts, uts);
+}
+EXPORT_SYMBOL_GPL(compat_put_timespec64);
+
int get_itimerspec64(struct itimerspec64 *it,
const struct itimerspec __user *uit)
{
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 4a4fd567fb26..cc2d23e6ff61 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1251,18 +1251,18 @@ EXPORT_SYMBOL(try_to_del_timer_sync);
*
* Note: For !irqsafe timers, you must not hold locks that are held in
* interrupt context while calling this function. Even if the lock has
- * nothing to do with the timer in question. Here's why:
+ * nothing to do with the timer in question. Here's why::
*
* CPU0 CPU1
* ---- ----
- * <SOFTIRQ>
- * call_timer_fn();
- * base->running_timer = mytimer;
- * spin_lock_irq(somelock);
+ * <SOFTIRQ>
+ * call_timer_fn();
+ * base->running_timer = mytimer;
+ * spin_lock_irq(somelock);
* <IRQ>
* spin_lock(somelock);
- * del_timer_sync(mytimer);
- * while (base->running_timer == mytimer);
+ * del_timer_sync(mytimer);
+ * while (base->running_timer == mytimer);
*
* Now del_timer_sync() will never return and never release somelock.
* The interrupt on the other CPU is waiting to grab somelock but
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index 675c4e9563a9..d647dabdac97 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -28,8 +28,6 @@ struct timer_list_iter {
u64 now;
};
-typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);
-
/*
* This allows printing both to /proc/timer_list and
* to the console (on SysRq-Q):