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authorLinus Torvalds <torvalds@linux-foundation.org>2016-10-03 18:09:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-03 18:09:13 -0700
commit5e1b834b27fb2c27cde33a0752425f11d10c0b2d (patch)
tree055c2c7165dcf0ccd73a273b16ad493ff48823a6 /kernel
parent49deffe0b0e4c2030696c7a6fd680bacf4761069 (diff)
parentb536fd587044af02183b3c02690431b93154f0fa (diff)
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer updates from Thomas Gleixner: "A rather smalish set of updates for timers and timekeeping: - Two core fixes to prevent potential undefinded behaviour about which gcc is complaining rightfully. - A fix to prevent stopping the tick on an (soon) offline CPU so it can complete the shutdown procedure. - Wait for clocks to stabilize before making decisions, so a not yet validated clock is not rejected. - The usual pile of fixes to the various clocksource drivers. - Core code typo and include fixlets" * 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: timekeeping: Include the correct header for errno definitions clocksource/drivers/ti-32k: Prevent ftrace recursion clocksource/mips-gic-timer: Stop checking cpu_has_counter clocksource/mips-gic-timer: Print an error if IRQ setup fails tick/nohz: Prevent stopping the tick on an offline CPU clocksource/drivers/oxnas: Add OX820 compatible clocksource/drivers/timer-atmel-pit: Simplify IRQ handler clocksource/drivers/timer-atmel-pit: Remove uselesss WARN_ON_ONCE clocksource/drivers/timer-atmel-pit: Drop at91sam926x_pit_common_init clocksource/drivers/moxart: Replace panic by pr_err clocksource/drivers/moxart: Replace setup_irq by request_irq clocksource/drivers/moxart: Add Aspeed support clocksource/drivers/moxart: Use struct to hold state clocksource/drivers/moxart: Refactor enable/disable time: Avoid undefined behaviour in ktime_add_safe() time: Avoid undefined behaviour in timespec64_add_safe() timekeeping: Prints the amounts of time spent during suspend clocksource: Defer override invalidation unless clock is unstable hrtimer: Spelling fixes
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/clocksource.c15
-rw-r--r--kernel/time/hrtimer.c6
-rw-r--r--kernel/time/tick-sched.c7
-rw-r--r--kernel/time/time.c2
-rw-r--r--kernel/time/timekeeping_debug.c2
5 files changed, 23 insertions, 9 deletions
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 6a5a310a1a53..7e4fad75acaa 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -600,9 +600,18 @@ static void __clocksource_select(bool skipcur)
*/
if (!(cs->flags & CLOCK_SOURCE_VALID_FOR_HRES) && oneshot) {
/* Override clocksource cannot be used. */
- pr_warn("Override clocksource %s is not HRT compatible - cannot switch while in HRT/NOHZ mode\n",
- cs->name);
- override_name[0] = 0;
+ if (cs->flags & CLOCK_SOURCE_UNSTABLE) {
+ pr_warn("Override clocksource %s is unstable and not HRT compatible - cannot switch while in HRT/NOHZ mode\n",
+ cs->name);
+ override_name[0] = 0;
+ } else {
+ /*
+ * The override cannot be currently verified.
+ * Deferring to let the watchdog check.
+ */
+ pr_info("Override clocksource %s is not currently HRT compatible - deferring\n",
+ cs->name);
+ }
} else
/* Override clocksource can be used. */
best = cs;
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 9ba7c820fc23..bb5ec425dfe0 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -307,7 +307,7 @@ EXPORT_SYMBOL_GPL(__ktime_divns);
*/
ktime_t ktime_add_safe(const ktime_t lhs, const ktime_t rhs)
{
- ktime_t res = ktime_add(lhs, rhs);
+ ktime_t res = ktime_add_unsafe(lhs, rhs);
/*
* We use KTIME_SEC_MAX here, the maximum timeout which we can
@@ -703,7 +703,7 @@ static void clock_was_set_work(struct work_struct *work)
static DECLARE_WORK(hrtimer_work, clock_was_set_work);
/*
- * Called from timekeeping and resume code to reprogramm the hrtimer
+ * Called from timekeeping and resume code to reprogram the hrtimer
* interrupt device on all cpus.
*/
void clock_was_set_delayed(void)
@@ -1241,7 +1241,7 @@ static void __run_hrtimer(struct hrtimer_cpu_base *cpu_base,
/*
* Note: We clear the running state after enqueue_hrtimer and
- * we do not reprogramm the event hardware. Happens either in
+ * we do not reprogram the event hardware. Happens either in
* hrtimer_start_range_ns() or in hrtimer_interrupt()
*
* Note: Because we dropped the cpu_base->lock above,
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 2ec7c00228f3..3bcb61b52f6c 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -186,10 +186,13 @@ static bool check_tick_dependency(atomic_t *dep)
return false;
}
-static bool can_stop_full_tick(struct tick_sched *ts)
+static bool can_stop_full_tick(int cpu, struct tick_sched *ts)
{
WARN_ON_ONCE(!irqs_disabled());
+ if (unlikely(!cpu_online(cpu)))
+ return false;
+
if (check_tick_dependency(&tick_dep_mask))
return false;
@@ -843,7 +846,7 @@ static void tick_nohz_full_update_tick(struct tick_sched *ts)
if (!ts->tick_stopped && ts->nohz_mode == NOHZ_MODE_INACTIVE)
return;
- if (can_stop_full_tick(ts))
+ if (can_stop_full_tick(cpu, ts))
tick_nohz_stop_sched_tick(ts, ktime_get(), cpu);
else if (ts->tick_stopped)
tick_nohz_restart_sched_tick(ts, ktime_get());
diff --git a/kernel/time/time.c b/kernel/time/time.c
index 667b9335f5d6..bd62fb8e8e77 100644
--- a/kernel/time/time.c
+++ b/kernel/time/time.c
@@ -780,7 +780,7 @@ struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
{
struct timespec64 res;
- set_normalized_timespec64(&res, lhs.tv_sec + rhs.tv_sec,
+ set_normalized_timespec64(&res, (timeu64_t) lhs.tv_sec + rhs.tv_sec,
lhs.tv_nsec + rhs.tv_nsec);
if (unlikely(res.tv_sec < lhs.tv_sec || res.tv_sec < rhs.tv_sec)) {
diff --git a/kernel/time/timekeeping_debug.c b/kernel/time/timekeeping_debug.c
index 107310a6f36f..ca9fb800336b 100644
--- a/kernel/time/timekeeping_debug.c
+++ b/kernel/time/timekeeping_debug.c
@@ -75,5 +75,7 @@ void tk_debug_account_sleep_time(struct timespec64 *t)
int bin = min(fls(t->tv_sec), NUM_BINS-1);
sleep_time_bin[bin]++;
+ pr_info("Suspended for %lld.%03lu seconds\n", (s64)t->tv_sec,
+ t->tv_nsec / NSEC_PER_MSEC);
}