Misc timer fixes:
- Address a (valid) W=1 build warning
- Fix timer self-tests
- Annotate a KCSAN warning wrt. accesses to the
tick_do_timer_cpu global variable.
- Address a !CONFIG_BUG build warning
Heads up for the !CONFIG_BUG warning patch, which we
addressed with:
5284984a4f bug: Fix no-return-statement warning with !CONFIG_BUG
Not everyone agreed though, see:
https://lore.kernel.org/all/20240410153212.127477-1-adrian.hunter@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'timers-urgent-2024-04-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer fixes from Ingo Molnar:
- Address a (valid) W=1 build warning
- Fix timer self-tests
- Annotate a KCSAN warning wrt. accesses to the tick_do_timer_cpu
global variable
- Address a !CONFIG_BUG build warning
* tag 'timers-urgent-2024-04-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
selftests: kselftest: Fix build failure with NOLIBC
selftests: timers: Fix abs() warning in posix_timers test
selftests: kselftest: Mark functions that unconditionally call exit() as __noreturn
selftests: timers: Fix posix_timers ksft_print_msg() warning
selftests: timers: Fix valid-adjtimex signed left-shift undefined behavior
bug: Fix no-return-statement warning with !CONFIG_BUG
timekeeping: Use READ/WRITE_ONCE() for tick_do_timer_cpu
selftests/timers/posix_timers: Reimplement check_timer_distribution()
irqflags: Explicitly ignore lockdep_hrtimer_exit() argument
This commit is contained in:
Linus Torvalds
commit
c748fc3b1f
@ -156,7 +156,10 @@ extern __printf(1, 2) void __warn_printk(const char *fmt, ...);
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#else /* !CONFIG_BUG */
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#ifndef HAVE_ARCH_BUG
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#define BUG() do {} while (1)
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#define BUG() do { \
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do {} while (1); \
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unreachable(); \
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} while (0)
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#endif
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#ifndef HAVE_ARCH_BUG_ON
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@ -114,7 +114,7 @@ do { \
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# define lockdep_softirq_enter() do { } while (0)
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# define lockdep_softirq_exit() do { } while (0)
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# define lockdep_hrtimer_enter(__hrtimer) false
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# define lockdep_hrtimer_exit(__context) do { } while (0)
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# define lockdep_hrtimer_exit(__context) do { (void)(__context); } while (0)
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# define lockdep_posixtimer_enter() do { } while (0)
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# define lockdep_posixtimer_exit() do { } while (0)
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# define lockdep_irq_work_enter(__work) do { } while (0)
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@ -7,6 +7,7 @@
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* Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
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* Copyright(C) 2006-2007, Timesys Corp., Thomas Gleixner
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*/
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#include <linux/compiler.h>
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#include <linux/cpu.h>
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#include <linux/err.h>
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#include <linux/hrtimer.h>
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@ -84,7 +85,7 @@ int tick_is_oneshot_available(void)
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*/
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static void tick_periodic(int cpu)
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{
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if (tick_do_timer_cpu == cpu) {
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if (READ_ONCE(tick_do_timer_cpu) == cpu) {
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raw_spin_lock(&jiffies_lock);
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write_seqcount_begin(&jiffies_seq);
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@ -215,8 +216,8 @@ static void tick_setup_device(struct tick_device *td,
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* If no cpu took the do_timer update, assign it to
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* this cpu:
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*/
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if (tick_do_timer_cpu == TICK_DO_TIMER_BOOT) {
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tick_do_timer_cpu = cpu;
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if (READ_ONCE(tick_do_timer_cpu) == TICK_DO_TIMER_BOOT) {
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WRITE_ONCE(tick_do_timer_cpu, cpu);
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tick_next_period = ktime_get();
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#ifdef CONFIG_NO_HZ_FULL
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/*
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@ -232,7 +233,7 @@ static void tick_setup_device(struct tick_device *td,
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!tick_nohz_full_cpu(cpu)) {
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tick_take_do_timer_from_boot();
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tick_do_timer_boot_cpu = -1;
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WARN_ON(tick_do_timer_cpu != cpu);
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WARN_ON(READ_ONCE(tick_do_timer_cpu) != cpu);
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#endif
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}
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@ -406,10 +407,10 @@ void tick_assert_timekeeping_handover(void)
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int tick_cpu_dying(unsigned int dying_cpu)
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{
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/*
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* If the current CPU is the timekeeper, it's the only one that
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* can safely hand over its duty. Also all online CPUs are in
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* stop machine, guaranteed not to be idle, therefore it's safe
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* to pick any online successor.
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* If the current CPU is the timekeeper, it's the only one that can
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* safely hand over its duty. Also all online CPUs are in stop
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* machine, guaranteed not to be idle, therefore there is no
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* concurrency and it's safe to pick any online successor.
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*/
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if (tick_do_timer_cpu == dying_cpu)
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tick_do_timer_cpu = cpumask_first(cpu_online_mask);
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@ -8,6 +8,7 @@
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*
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* Started by: Thomas Gleixner and Ingo Molnar
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*/
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#include <linux/compiler.h>
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#include <linux/cpu.h>
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#include <linux/err.h>
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#include <linux/hrtimer.h>
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@ -204,7 +205,7 @@ static inline void tick_sched_flag_clear(struct tick_sched *ts,
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static void tick_sched_do_timer(struct tick_sched *ts, ktime_t now)
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{
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int cpu = smp_processor_id();
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int tick_cpu, cpu = smp_processor_id();
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/*
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* Check if the do_timer duty was dropped. We don't care about
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@ -216,16 +217,18 @@ static void tick_sched_do_timer(struct tick_sched *ts, ktime_t now)
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* If nohz_full is enabled, this should not happen because the
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* 'tick_do_timer_cpu' CPU never relinquishes.
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*/
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if (IS_ENABLED(CONFIG_NO_HZ_COMMON) &&
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unlikely(tick_do_timer_cpu == TICK_DO_TIMER_NONE)) {
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tick_cpu = READ_ONCE(tick_do_timer_cpu);
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if (IS_ENABLED(CONFIG_NO_HZ_COMMON) && unlikely(tick_cpu == TICK_DO_TIMER_NONE)) {
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#ifdef CONFIG_NO_HZ_FULL
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WARN_ON_ONCE(tick_nohz_full_running);
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#endif
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tick_do_timer_cpu = cpu;
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WRITE_ONCE(tick_do_timer_cpu, cpu);
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tick_cpu = cpu;
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}
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/* Check if jiffies need an update */
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if (tick_do_timer_cpu == cpu)
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if (tick_cpu == cpu)
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tick_do_update_jiffies64(now);
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/*
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@ -610,7 +613,7 @@ bool tick_nohz_cpu_hotpluggable(unsigned int cpu)
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* timers, workqueues, timekeeping, ...) on behalf of full dynticks
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* CPUs. It must remain online when nohz full is enabled.
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*/
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if (tick_nohz_full_running && tick_do_timer_cpu == cpu)
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if (tick_nohz_full_running && READ_ONCE(tick_do_timer_cpu) == cpu)
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return false;
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return true;
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}
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@ -891,6 +894,7 @@ static ktime_t tick_nohz_next_event(struct tick_sched *ts, int cpu)
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{
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u64 basemono, next_tick, delta, expires;
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unsigned long basejiff;
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int tick_cpu;
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basemono = get_jiffies_update(&basejiff);
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ts->last_jiffies = basejiff;
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@ -947,9 +951,9 @@ static ktime_t tick_nohz_next_event(struct tick_sched *ts, int cpu)
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* Otherwise we can sleep as long as we want.
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*/
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delta = timekeeping_max_deferment();
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if (cpu != tick_do_timer_cpu &&
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(tick_do_timer_cpu != TICK_DO_TIMER_NONE ||
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!tick_sched_flag_test(ts, TS_FLAG_DO_TIMER_LAST)))
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tick_cpu = READ_ONCE(tick_do_timer_cpu);
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if (tick_cpu != cpu &&
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(tick_cpu != TICK_DO_TIMER_NONE || !tick_sched_flag_test(ts, TS_FLAG_DO_TIMER_LAST)))
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delta = KTIME_MAX;
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/* Calculate the next expiry time */
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@ -970,6 +974,7 @@ static void tick_nohz_stop_tick(struct tick_sched *ts, int cpu)
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unsigned long basejiff = ts->last_jiffies;
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u64 basemono = ts->timer_expires_base;
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bool timer_idle = tick_sched_flag_test(ts, TS_FLAG_STOPPED);
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int tick_cpu;
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u64 expires;
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/* Make sure we won't be trying to stop it twice in a row. */
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@ -1007,10 +1012,11 @@ static void tick_nohz_stop_tick(struct tick_sched *ts, int cpu)
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* do_timer() never gets invoked. Keep track of the fact that it
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* was the one which had the do_timer() duty last.
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*/
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if (cpu == tick_do_timer_cpu) {
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tick_do_timer_cpu = TICK_DO_TIMER_NONE;
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tick_cpu = READ_ONCE(tick_do_timer_cpu);
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if (tick_cpu == cpu) {
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WRITE_ONCE(tick_do_timer_cpu, TICK_DO_TIMER_NONE);
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tick_sched_flag_set(ts, TS_FLAG_DO_TIMER_LAST);
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} else if (tick_do_timer_cpu != TICK_DO_TIMER_NONE) {
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} else if (tick_cpu != TICK_DO_TIMER_NONE) {
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tick_sched_flag_clear(ts, TS_FLAG_DO_TIMER_LAST);
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}
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@ -1173,15 +1179,17 @@ static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)
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return false;
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if (tick_nohz_full_enabled()) {
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int tick_cpu = READ_ONCE(tick_do_timer_cpu);
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/*
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* Keep the tick alive to guarantee timekeeping progression
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* if there are full dynticks CPUs around
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*/
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if (tick_do_timer_cpu == cpu)
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if (tick_cpu == cpu)
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return false;
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/* Should not happen for nohz-full */
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if (WARN_ON_ONCE(tick_do_timer_cpu == TICK_DO_TIMER_NONE))
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if (WARN_ON_ONCE(tick_cpu == TICK_DO_TIMER_NONE))
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return false;
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}
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@ -51,6 +51,7 @@
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#include <stdarg.h>
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#include <string.h>
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#include <stdio.h>
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#include <sys/utsname.h>
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#endif
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#ifndef ARRAY_SIZE
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@ -79,6 +80,9 @@
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#define KSFT_XPASS 3
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#define KSFT_SKIP 4
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#ifndef __noreturn
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#define __noreturn __attribute__((__noreturn__))
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#endif
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#define __printf(a, b) __attribute__((format(printf, a, b)))
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|
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/* counters */
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@ -299,13 +303,13 @@ void ksft_test_result_code(int exit_code, const char *test_name,
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va_end(args);
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}
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static inline int ksft_exit_pass(void)
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static inline __noreturn int ksft_exit_pass(void)
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{
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ksft_print_cnts();
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exit(KSFT_PASS);
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}
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static inline int ksft_exit_fail(void)
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static inline __noreturn int ksft_exit_fail(void)
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{
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ksft_print_cnts();
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exit(KSFT_FAIL);
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@ -332,7 +336,7 @@ static inline int ksft_exit_fail(void)
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ksft_cnt.ksft_xfail + \
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ksft_cnt.ksft_xskip)
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static inline __printf(1, 2) int ksft_exit_fail_msg(const char *msg, ...)
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static inline __noreturn __printf(1, 2) int ksft_exit_fail_msg(const char *msg, ...)
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{
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int saved_errno = errno;
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va_list args;
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@ -347,19 +351,19 @@ static inline __printf(1, 2) int ksft_exit_fail_msg(const char *msg, ...)
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exit(KSFT_FAIL);
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}
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static inline int ksft_exit_xfail(void)
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static inline __noreturn int ksft_exit_xfail(void)
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{
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ksft_print_cnts();
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exit(KSFT_XFAIL);
|
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}
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|
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static inline int ksft_exit_xpass(void)
|
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static inline __noreturn int ksft_exit_xpass(void)
|
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{
|
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ksft_print_cnts();
|
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exit(KSFT_XPASS);
|
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}
|
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|
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static inline __printf(1, 2) int ksft_exit_skip(const char *msg, ...)
|
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static inline __noreturn __printf(1, 2) int ksft_exit_skip(const char *msg, ...)
|
||||
{
|
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int saved_errno = errno;
|
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va_list args;
|
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@ -388,4 +392,21 @@ static inline __printf(1, 2) int ksft_exit_skip(const char *msg, ...)
|
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exit(KSFT_SKIP);
|
||||
}
|
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|
||||
static inline int ksft_min_kernel_version(unsigned int min_major,
|
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unsigned int min_minor)
|
||||
{
|
||||
#ifdef NOLIBC
|
||||
ksft_print_msg("NOLIBC: Can't check kernel version: Function not implemented\n");
|
||||
return 0;
|
||||
#else
|
||||
unsigned int major, minor;
|
||||
struct utsname info;
|
||||
|
||||
if (uname(&info) || sscanf(info.release, "%u.%u.", &major, &minor) != 2)
|
||||
ksft_exit_fail_msg("Can't parse kernel version\n");
|
||||
|
||||
return major > min_major || (major == min_major && minor >= min_minor);
|
||||
#endif
|
||||
}
|
||||
|
||||
#endif /* __KSELFTEST_H */
|
||||
|
||||
@ -66,7 +66,7 @@ static int check_diff(struct timeval start, struct timeval end)
|
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diff = end.tv_usec - start.tv_usec;
|
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diff += (end.tv_sec - start.tv_sec) * USECS_PER_SEC;
|
||||
|
||||
if (abs(diff - DELAY * USECS_PER_SEC) > USECS_PER_SEC / 2) {
|
||||
if (llabs(diff - DELAY * USECS_PER_SEC) > USECS_PER_SEC / 2) {
|
||||
printf("Diff too high: %lld..", diff);
|
||||
return -1;
|
||||
}
|
||||
@ -184,80 +184,71 @@ static int check_timer_create(int which)
|
||||
return 0;
|
||||
}
|
||||
|
||||
int remain;
|
||||
__thread int got_signal;
|
||||
static pthread_t ctd_thread;
|
||||
static volatile int ctd_count, ctd_failed;
|
||||
|
||||
static void *distribution_thread(void *arg)
|
||||
static void ctd_sighandler(int sig)
|
||||
{
|
||||
while (__atomic_load_n(&remain, __ATOMIC_RELAXED));
|
||||
return NULL;
|
||||
if (pthread_self() != ctd_thread)
|
||||
ctd_failed = 1;
|
||||
ctd_count--;
|
||||
}
|
||||
|
||||
static void distribution_handler(int nr)
|
||||
static void *ctd_thread_func(void *arg)
|
||||
{
|
||||
if (!__atomic_exchange_n(&got_signal, 1, __ATOMIC_RELAXED))
|
||||
__atomic_fetch_sub(&remain, 1, __ATOMIC_RELAXED);
|
||||
}
|
||||
|
||||
/*
|
||||
* Test that all running threads _eventually_ receive CLOCK_PROCESS_CPUTIME_ID
|
||||
* timer signals. This primarily tests that the kernel does not favour any one.
|
||||
*/
|
||||
static int check_timer_distribution(void)
|
||||
{
|
||||
int err, i;
|
||||
timer_t id;
|
||||
const int nthreads = 10;
|
||||
pthread_t threads[nthreads];
|
||||
struct itimerspec val = {
|
||||
.it_value.tv_sec = 0,
|
||||
.it_value.tv_nsec = 1000 * 1000,
|
||||
.it_interval.tv_sec = 0,
|
||||
.it_interval.tv_nsec = 1000 * 1000,
|
||||
};
|
||||
timer_t id;
|
||||
|
||||
remain = nthreads + 1; /* worker threads + this thread */
|
||||
signal(SIGALRM, distribution_handler);
|
||||
err = timer_create(CLOCK_PROCESS_CPUTIME_ID, NULL, &id);
|
||||
if (err < 0) {
|
||||
ksft_perror("Can't create timer");
|
||||
return -1;
|
||||
}
|
||||
err = timer_settime(id, 0, &val, NULL);
|
||||
if (err < 0) {
|
||||
ksft_perror("Can't set timer");
|
||||
return -1;
|
||||
}
|
||||
/* 1/10 seconds to ensure the leader sleeps */
|
||||
usleep(10000);
|
||||
|
||||
for (i = 0; i < nthreads; i++) {
|
||||
err = pthread_create(&threads[i], NULL, distribution_thread,
|
||||
NULL);
|
||||
if (err) {
|
||||
ksft_print_msg("Can't create thread: %s (%d)\n",
|
||||
strerror(errno), errno);
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
ctd_count = 100;
|
||||
if (timer_create(CLOCK_PROCESS_CPUTIME_ID, NULL, &id))
|
||||
return "Can't create timer\n";
|
||||
if (timer_settime(id, 0, &val, NULL))
|
||||
return "Can't set timer\n";
|
||||
|
||||
/* Wait for all threads to receive the signal. */
|
||||
while (__atomic_load_n(&remain, __ATOMIC_RELAXED));
|
||||
while (ctd_count > 0 && !ctd_failed)
|
||||
;
|
||||
|
||||
for (i = 0; i < nthreads; i++) {
|
||||
err = pthread_join(threads[i], NULL);
|
||||
if (err) {
|
||||
ksft_print_msg("Can't join thread: %s (%d)\n",
|
||||
strerror(errno), errno);
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
if (timer_delete(id))
|
||||
return "Can't delete timer\n";
|
||||
|
||||
if (timer_delete(id)) {
|
||||
ksft_perror("Can't delete timer");
|
||||
return -1;
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
ksft_test_result_pass("check_timer_distribution\n");
|
||||
/*
|
||||
* Test that only the running thread receives the timer signal.
|
||||
*/
|
||||
static int check_timer_distribution(void)
|
||||
{
|
||||
const char *errmsg;
|
||||
|
||||
signal(SIGALRM, ctd_sighandler);
|
||||
|
||||
errmsg = "Can't create thread\n";
|
||||
if (pthread_create(&ctd_thread, NULL, ctd_thread_func, NULL))
|
||||
goto err;
|
||||
|
||||
errmsg = "Can't join thread\n";
|
||||
if (pthread_join(ctd_thread, (void **)&errmsg) || errmsg)
|
||||
goto err;
|
||||
|
||||
if (!ctd_failed)
|
||||
ksft_test_result_pass("check signal distribution\n");
|
||||
else if (ksft_min_kernel_version(6, 3))
|
||||
ksft_test_result_fail("check signal distribution\n");
|
||||
else
|
||||
ksft_test_result_skip("check signal distribution (old kernel)\n");
|
||||
return 0;
|
||||
err:
|
||||
ksft_print_msg("%s", errmsg);
|
||||
return -1;
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
|
||||
@ -21,9 +21,6 @@
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*/
|
||||
|
||||
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <time.h>
|
||||
@ -62,45 +59,47 @@ int clear_time_state(void)
|
||||
#define NUM_FREQ_OUTOFRANGE 4
|
||||
#define NUM_FREQ_INVALID 2
|
||||
|
||||
#define SHIFTED_PPM (1 << 16)
|
||||
|
||||
long valid_freq[NUM_FREQ_VALID] = {
|
||||
-499<<16,
|
||||
-450<<16,
|
||||
-400<<16,
|
||||
-350<<16,
|
||||
-300<<16,
|
||||
-250<<16,
|
||||
-200<<16,
|
||||
-150<<16,
|
||||
-100<<16,
|
||||
-75<<16,
|
||||
-50<<16,
|
||||
-25<<16,
|
||||
-10<<16,
|
||||
-5<<16,
|
||||
-1<<16,
|
||||
-499 * SHIFTED_PPM,
|
||||
-450 * SHIFTED_PPM,
|
||||
-400 * SHIFTED_PPM,
|
||||
-350 * SHIFTED_PPM,
|
||||
-300 * SHIFTED_PPM,
|
||||
-250 * SHIFTED_PPM,
|
||||
-200 * SHIFTED_PPM,
|
||||
-150 * SHIFTED_PPM,
|
||||
-100 * SHIFTED_PPM,
|
||||
-75 * SHIFTED_PPM,
|
||||
-50 * SHIFTED_PPM,
|
||||
-25 * SHIFTED_PPM,
|
||||
-10 * SHIFTED_PPM,
|
||||
-5 * SHIFTED_PPM,
|
||||
-1 * SHIFTED_PPM,
|
||||
-1000,
|
||||
1<<16,
|
||||
5<<16,
|
||||
10<<16,
|
||||
25<<16,
|
||||
50<<16,
|
||||
75<<16,
|
||||
100<<16,
|
||||
150<<16,
|
||||
200<<16,
|
||||
250<<16,
|
||||
300<<16,
|
||||
350<<16,
|
||||
400<<16,
|
||||
450<<16,
|
||||
499<<16,
|
||||
1 * SHIFTED_PPM,
|
||||
5 * SHIFTED_PPM,
|
||||
10 * SHIFTED_PPM,
|
||||
25 * SHIFTED_PPM,
|
||||
50 * SHIFTED_PPM,
|
||||
75 * SHIFTED_PPM,
|
||||
100 * SHIFTED_PPM,
|
||||
150 * SHIFTED_PPM,
|
||||
200 * SHIFTED_PPM,
|
||||
250 * SHIFTED_PPM,
|
||||
300 * SHIFTED_PPM,
|
||||
350 * SHIFTED_PPM,
|
||||
400 * SHIFTED_PPM,
|
||||
450 * SHIFTED_PPM,
|
||||
499 * SHIFTED_PPM,
|
||||
};
|
||||
|
||||
long outofrange_freq[NUM_FREQ_OUTOFRANGE] = {
|
||||
-1000<<16,
|
||||
-550<<16,
|
||||
550<<16,
|
||||
1000<<16,
|
||||
-1000 * SHIFTED_PPM,
|
||||
-550 * SHIFTED_PPM,
|
||||
550 * SHIFTED_PPM,
|
||||
1000 * SHIFTED_PPM,
|
||||
};
|
||||
|
||||
#define LONG_MAX (~0UL>>1)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user