diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/cgroup/cgroup.c | 13 | ||||
| -rw-r--r-- | kernel/events/core.c | 17 | ||||
| -rw-r--r-- | kernel/irq/debugfs.c | 1 | ||||
| -rw-r--r-- | kernel/irq/manage.c | 7 | ||||
| -rw-r--r-- | kernel/irq/msi.c | 5 | ||||
| -rw-r--r-- | kernel/kallsyms.c | 5 | ||||
| -rw-r--r-- | kernel/power/suspend.c | 9 | ||||
| -rw-r--r-- | kernel/smp.c | 2 | ||||
| -rw-r--r-- | kernel/time/clocksource.c | 11 | ||||
| -rw-r--r-- | kernel/trace/trace_events_hist.c | 227 | ||||
| -rw-r--r-- | kernel/trace/trace_kprobe.c | 2 | ||||
| -rw-r--r-- | kernel/up.c | 3 |
12 files changed, 140 insertions, 162 deletions
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index db552b9f9377..75f687301bbf 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -5927,11 +5927,14 @@ void cgroup_post_fork(struct task_struct *child) spin_lock_irq(&css_set_lock); - WARN_ON_ONCE(!list_empty(&child->cg_list)); - cset = task_css_set(current); /* current is @child's parent */ - get_css_set(cset); - cset->nr_tasks++; - css_set_move_task(child, NULL, cset, false); + /* init tasks are special, only link regular threads */ + if (likely(child->pid)) { + WARN_ON_ONCE(!list_empty(&child->cg_list)); + cset = task_css_set(current); /* current is @child's parent */ + get_css_set(cset); + cset->nr_tasks++; + css_set_move_task(child, NULL, cset, false); + } /* * If the cgroup has to be frozen, the new task has too. Let's set diff --git a/kernel/events/core.c b/kernel/events/core.c index 17f9a4a909eb..e453589da97c 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -951,9 +951,9 @@ list_update_cgroup_event(struct perf_event *event, /* * Because cgroup events are always per-cpu events, - * this will always be called from the right CPU. + * @ctx == &cpuctx->ctx. */ - cpuctx = __get_cpu_context(ctx); + cpuctx = container_of(ctx, struct perf_cpu_context, ctx); /* * Since setting cpuctx->cgrp is conditional on the current @cgrp @@ -979,7 +979,8 @@ list_update_cgroup_event(struct perf_event *event, cpuctx_entry = &cpuctx->cgrp_cpuctx_entry; if (add) - list_add(cpuctx_entry, this_cpu_ptr(&cgrp_cpuctx_list)); + list_add(cpuctx_entry, + per_cpu_ptr(&cgrp_cpuctx_list, event->cpu)); else list_del(cpuctx_entry); } @@ -5916,7 +5917,15 @@ accounting: */ user_lock_limit *= num_online_cpus(); - user_locked = atomic_long_read(&user->locked_vm) + user_extra; + user_locked = atomic_long_read(&user->locked_vm); + + /* + * sysctl_perf_event_mlock may have changed, so that + * user->locked_vm > user_lock_limit + */ + if (user_locked > user_lock_limit) + user_locked = user_lock_limit; + user_locked += user_extra; if (user_locked > user_lock_limit) { /* diff --git a/kernel/irq/debugfs.c b/kernel/irq/debugfs.c index c1eccd4f6520..a949bd39e343 100644 --- a/kernel/irq/debugfs.c +++ b/kernel/irq/debugfs.c @@ -114,6 +114,7 @@ static const struct irq_bit_descr irqdata_states[] = { BIT_MASK_DESCR(IRQD_AFFINITY_MANAGED), BIT_MASK_DESCR(IRQD_MANAGED_SHUTDOWN), BIT_MASK_DESCR(IRQD_CAN_RESERVE), + BIT_MASK_DESCR(IRQD_MSI_NOMASK_QUIRK), BIT_MASK_DESCR(IRQD_FORWARDED_TO_VCPU), diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 818b2802d3e7..3089a60ea8f9 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -731,6 +731,13 @@ static int set_irq_wake_real(unsigned int irq, unsigned int on) * * Wakeup mode lets this IRQ wake the system from sleep * states like "suspend to RAM". + * + * Note: irq enable/disable state is completely orthogonal + * to the enable/disable state of irq wake. An irq can be + * disabled with disable_irq() and still wake the system as + * long as the irq has wake enabled. If this does not hold, + * then the underlying irq chip and the related driver need + * to be investigated. */ int irq_set_irq_wake(unsigned int irq, unsigned int on) { diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index ad26fbcfbfc8..eb95f6106a1e 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -453,8 +453,11 @@ int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev, continue; irq_data = irq_domain_get_irq_data(domain, desc->irq); - if (!can_reserve) + if (!can_reserve) { irqd_clr_can_reserve(irq_data); + if (domain->flags & IRQ_DOMAIN_MSI_NOMASK_QUIRK) + irqd_set_msi_nomask_quirk(irq_data); + } ret = irq_domain_activate_irq(irq_data, can_reserve); if (ret) goto cleanup; diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c index d812b90f4c86..a9b3f660dee7 100644 --- a/kernel/kallsyms.c +++ b/kernel/kallsyms.c @@ -44,7 +44,7 @@ __attribute__((weak, section(".rodata"))); extern const unsigned long kallsyms_relative_base __attribute__((weak, section(".rodata"))); -extern const u8 kallsyms_token_table[] __weak; +extern const char kallsyms_token_table[] __weak; extern const u16 kallsyms_token_index[] __weak; extern const unsigned int kallsyms_markers[] __weak; @@ -58,7 +58,8 @@ static unsigned int kallsyms_expand_symbol(unsigned int off, char *result, size_t maxlen) { int len, skipped_first = 0; - const u8 *tptr, *data; + const char *tptr; + const u8 *data; /* Get the compressed symbol length from the first symbol byte. */ data = &kallsyms_names[off]; diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 2c47280fbfc7..8b1bb5ee7e5d 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -131,11 +131,12 @@ static void s2idle_loop(void) * to avoid them upfront. */ for (;;) { - if (s2idle_ops && s2idle_ops->wake) - s2idle_ops->wake(); - - if (pm_wakeup_pending()) + if (s2idle_ops && s2idle_ops->wake) { + if (s2idle_ops->wake()) + break; + } else if (pm_wakeup_pending()) { break; + } pm_wakeup_clear(false); diff --git a/kernel/smp.c b/kernel/smp.c index 3b7bedc97af3..d0ada39eb4d4 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -435,7 +435,7 @@ static void smp_call_function_many_cond(const struct cpumask *mask, /* Fastpath: do that cpu by itself. */ if (next_cpu >= nr_cpu_ids) { - if (!cond_func || (cond_func && cond_func(cpu, info))) + if (!cond_func || cond_func(cpu, info)) smp_call_function_single(cpu, func, info, wait); return; } diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c index fff5f64981c6..428beb69426a 100644 --- a/kernel/time/clocksource.c +++ b/kernel/time/clocksource.c @@ -293,8 +293,15 @@ static void clocksource_watchdog(struct timer_list *unused) next_cpu = cpumask_next(raw_smp_processor_id(), cpu_online_mask); if (next_cpu >= nr_cpu_ids) next_cpu = cpumask_first(cpu_online_mask); - watchdog_timer.expires += WATCHDOG_INTERVAL; - add_timer_on(&watchdog_timer, next_cpu); + + /* + * Arm timer if not already pending: could race with concurrent + * pair clocksource_stop_watchdog() clocksource_start_watchdog(). + */ + if (!timer_pending(&watchdog_timer)) { + watchdog_timer.expires += WATCHDOG_INTERVAL; + add_timer_on(&watchdog_timer, next_cpu); + } out: spin_unlock(&watchdog_lock); } diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index e7ce7cdac62f..483b3fd1094f 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -1798,6 +1798,60 @@ void synth_event_cmd_init(struct dynevent_cmd *cmd, char *buf, int maxlen) } EXPORT_SYMBOL_GPL(synth_event_cmd_init); +static inline int +__synth_event_trace_start(struct trace_event_file *file, + struct synth_event_trace_state *trace_state) +{ + int entry_size, fields_size = 0; + int ret = 0; + + /* + * Normal event tracing doesn't get called at all unless the + * ENABLED bit is set (which attaches the probe thus allowing + * this code to be called, etc). Because this is called + * directly by the user, we don't have that but we still need + * to honor not logging when disabled. For the the iterated + * trace case, we save the enabed state upon start and just + * ignore the following data calls. + */ + if (!(file->flags & EVENT_FILE_FL_ENABLED) || + trace_trigger_soft_disabled(file)) { + trace_state->disabled = true; + ret = -ENOENT; + goto out; + } + + trace_state->event = file->event_call->data; + + fields_size = trace_state->event->n_u64 * sizeof(u64); + + /* + * Avoid ring buffer recursion detection, as this event + * is being performed within another event. + */ + trace_state->buffer = file->tr->array_buffer.buffer; + ring_buffer_nest_start(trace_state->buffer); + + entry_size = sizeof(*trace_state->entry) + fields_size; + trace_state->entry = trace_event_buffer_reserve(&trace_state->fbuffer, + file, + entry_size); + if (!trace_state->entry) { + ring_buffer_nest_end(trace_state->buffer); + ret = -EINVAL; + } +out: + return ret; +} + +static inline void +__synth_event_trace_end(struct synth_event_trace_state *trace_state) +{ + trace_event_buffer_commit(&trace_state->fbuffer); + + ring_buffer_nest_end(trace_state->buffer); +} + /** * synth_event_trace - Trace a synthetic event * @file: The trace_event_file representing the synthetic event @@ -1819,71 +1873,38 @@ EXPORT_SYMBOL_GPL(synth_event_cmd_init); */ int synth_event_trace(struct trace_event_file *file, unsigned int n_vals, ...) { - struct trace_event_buffer fbuffer; - struct synth_trace_event *entry; - struct trace_buffer *buffer; - struct synth_event *event; + struct synth_event_trace_state state; unsigned int i, n_u64; - int fields_size = 0; va_list args; - int ret = 0; - - /* - * Normal event generation doesn't get called at all unless - * the ENABLED bit is set (which attaches the probe thus - * allowing this code to be called, etc). Because this is - * called directly by the user, we don't have that but we - * still need to honor not logging when disabled. - */ - if (!(file->flags & EVENT_FILE_FL_ENABLED)) - return 0; - - event = file->event_call->data; - - if (n_vals != event->n_fields) - return -EINVAL; - - if (trace_trigger_soft_disabled(file)) - return -EINVAL; - - fields_size = event->n_u64 * sizeof(u64); - - /* - * Avoid ring buffer recursion detection, as this event - * is being performed within another event. - */ - buffer = file->tr->array_buffer.buffer; - ring_buffer_nest_start(buffer); + int ret; - entry = trace_event_buffer_reserve(&fbuffer, file, - sizeof(*entry) + fields_size); - if (!entry) { - ret = -EINVAL; - goto out; + ret = __synth_event_trace_start(file, &state); + if (ret) { + if (ret == -ENOENT) + ret = 0; /* just disabled, not really an error */ + return ret; } va_start(args, n_vals); - for (i = 0, n_u64 = 0; i < event->n_fields; i++) { + for (i = 0, n_u64 = 0; i < state.event->n_fields; i++) { u64 val; val = va_arg(args, u64); - if (event->fields[i]->is_string) { + if (state.event->fields[i]->is_string) { char *str_val = (char *)(long)val; - char *str_field = (char *)&entry->fields[n_u64]; + char *str_field = (char *)&state.entry->fields[n_u64]; strscpy(str_field, str_val, STR_VAR_LEN_MAX); n_u64 += STR_VAR_LEN_MAX / sizeof(u64); } else { - entry->fields[n_u64] = val; + state.entry->fields[n_u64] = val; n_u64++; } } va_end(args); - trace_event_buffer_commit(&fbuffer); -out: - ring_buffer_nest_end(buffer); + __synth_event_trace_end(&state); return ret; } @@ -1910,64 +1931,31 @@ EXPORT_SYMBOL_GPL(synth_event_trace); int synth_event_trace_array(struct trace_event_file *file, u64 *vals, unsigned int n_vals) { - struct trace_event_buffer fbuffer; - struct synth_trace_event *entry; - struct trace_buffer *buffer; - struct synth_event *event; + struct synth_event_trace_state state; unsigned int i, n_u64; - int fields_size = 0; - int ret = 0; - - /* - * Normal event generation doesn't get called at all unless - * the ENABLED bit is set (which attaches the probe thus - * allowing this code to be called, etc). Because this is - * called directly by the user, we don't have that but we - * still need to honor not logging when disabled. - */ - if (!(file->flags & EVENT_FILE_FL_ENABLED)) - return 0; - - event = file->event_call->data; - - if (n_vals != event->n_fields) - return -EINVAL; - - if (trace_trigger_soft_disabled(file)) - return -EINVAL; - - fields_size = event->n_u64 * sizeof(u64); - - /* - * Avoid ring buffer recursion detection, as this event - * is being performed within another event. - */ - buffer = file->tr->array_buffer.buffer; - ring_buffer_nest_start(buffer); + int ret; - entry = trace_event_buffer_reserve(&fbuffer, file, - sizeof(*entry) + fields_size); - if (!entry) { - ret = -EINVAL; - goto out; + ret = __synth_event_trace_start(file, &state); + if (ret) { + if (ret == -ENOENT) + ret = 0; /* just disabled, not really an error */ + return ret; } - for (i = 0, n_u64 = 0; i < event->n_fields; i++) { - if (event->fields[i]->is_string) { + for (i = 0, n_u64 = 0; i < state.event->n_fields; i++) { + if (state.event->fields[i]->is_string) { char *str_val = (char *)(long)vals[i]; - char *str_field = (char *)&entry->fields[n_u64]; + char *str_field = (char *)&state.entry->fields[n_u64]; strscpy(str_field, str_val, STR_VAR_LEN_MAX); n_u64 += STR_VAR_LEN_MAX / sizeof(u64); } else { - entry->fields[n_u64] = vals[i]; + state.entry->fields[n_u64] = vals[i]; n_u64++; } } - trace_event_buffer_commit(&fbuffer); -out: - ring_buffer_nest_end(buffer); + __synth_event_trace_end(&state); return ret; } @@ -2004,58 +1992,17 @@ EXPORT_SYMBOL_GPL(synth_event_trace_array); int synth_event_trace_start(struct trace_event_file *file, struct synth_event_trace_state *trace_state) { - struct synth_trace_event *entry; - int fields_size = 0; - int ret = 0; + int ret; - if (!trace_state) { - ret = -EINVAL; - goto out; - } + if (!trace_state) + return -EINVAL; memset(trace_state, '\0', sizeof(*trace_state)); - /* - * Normal event tracing doesn't get called at all unless the - * ENABLED bit is set (which attaches the probe thus allowing - * this code to be called, etc). Because this is called - * directly by the user, we don't have that but we still need - * to honor not logging when disabled. For the the iterated - * trace case, we save the enabed state upon start and just - * ignore the following data calls. - */ - if (!(file->flags & EVENT_FILE_FL_ENABLED)) { - trace_state->enabled = false; - goto out; - } - - trace_state->enabled = true; - - trace_state->event = file->event_call->data; - - if (trace_trigger_soft_disabled(file)) { - ret = -EINVAL; - goto out; - } + ret = __synth_event_trace_start(file, trace_state); + if (ret == -ENOENT) + ret = 0; /* just disabled, not really an error */ - fields_size = trace_state->event->n_u64 * sizeof(u64); - - /* - * Avoid ring buffer recursion detection, as this event - * is being performed within another event. - */ - trace_state->buffer = file->tr->array_buffer.buffer; - ring_buffer_nest_start(trace_state->buffer); - - entry = trace_event_buffer_reserve(&trace_state->fbuffer, file, - sizeof(*entry) + fields_size); - if (!entry) { - ret = -EINVAL; - goto out; - } - - trace_state->entry = entry; -out: return ret; } EXPORT_SYMBOL_GPL(synth_event_trace_start); @@ -2088,7 +2035,7 @@ static int __synth_event_add_val(const char *field_name, u64 val, trace_state->add_next = true; } - if (!trace_state->enabled) + if (trace_state->disabled) goto out; event = trace_state->event; @@ -2223,9 +2170,7 @@ int synth_event_trace_end(struct synth_event_trace_state *trace_state) if (!trace_state) return -EINVAL; - trace_event_buffer_commit(&trace_state->fbuffer); - - ring_buffer_nest_end(trace_state->buffer); + __synth_event_trace_end(trace_state); return 0; } diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index d8264ebb9581..362cca52f5de 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -1012,7 +1012,7 @@ int __kprobe_event_add_fields(struct dynevent_cmd *cmd, ...) { struct dynevent_arg arg; va_list args; - int ret; + int ret = 0; if (cmd->type != DYNEVENT_TYPE_KPROBE) return -EINVAL; diff --git a/kernel/up.c b/kernel/up.c index 53144d056252..c6f323dcd45b 100644 --- a/kernel/up.c +++ b/kernel/up.c @@ -14,7 +14,8 @@ int smp_call_function_single(int cpu, void (*func) (void *info), void *info, { unsigned long flags; - WARN_ON(cpu != 0); + if (cpu != 0) + return -ENXIO; local_irq_save(flags); func(info); |