diff options
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/events/core.c | 19 | ||||
-rw-r--r-- | kernel/events/hw_breakpoint.c | 4 | ||||
-rw-r--r-- | kernel/fork.c | 7 | ||||
-rw-r--r-- | kernel/irq/autoprobe.c | 4 | ||||
-rw-r--r-- | kernel/irq/chip.c | 42 | ||||
-rw-r--r-- | kernel/irq/internals.h | 2 | ||||
-rw-r--r-- | kernel/irq/manage.c | 2 | ||||
-rw-r--r-- | kernel/kprobes.c | 6 | ||||
-rw-r--r-- | kernel/params.c | 3 | ||||
-rw-r--r-- | kernel/pid.c | 4 | ||||
-rw-r--r-- | kernel/power/power.h | 24 | ||||
-rw-r--r-- | kernel/power/process.c | 7 | ||||
-rw-r--r-- | kernel/power/user.c | 6 | ||||
-rw-r--r-- | kernel/relay.c | 10 | ||||
-rw-r--r-- | kernel/sched/core.c | 1 | ||||
-rw-r--r-- | kernel/sched/fair.c | 2 |
16 files changed, 108 insertions, 35 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index 5e0f8bb..e8b32ac 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -2303,7 +2303,7 @@ do { \ static DEFINE_PER_CPU(int, perf_throttled_count); static DEFINE_PER_CPU(u64, perf_throttled_seq); -static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count) +static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count, bool disable) { struct hw_perf_event *hwc = &event->hw; s64 period, sample_period; @@ -2322,9 +2322,13 @@ static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count) hwc->sample_period = sample_period; if (local64_read(&hwc->period_left) > 8*sample_period) { - event->pmu->stop(event, PERF_EF_UPDATE); + if (disable) + event->pmu->stop(event, PERF_EF_UPDATE); + local64_set(&hwc->period_left, 0); - event->pmu->start(event, PERF_EF_RELOAD); + + if (disable) + event->pmu->start(event, PERF_EF_RELOAD); } } @@ -2350,6 +2354,7 @@ static void perf_adjust_freq_unthr_context(struct perf_event_context *ctx, return; raw_spin_lock(&ctx->lock); + perf_pmu_disable(ctx->pmu); list_for_each_entry_rcu(event, &ctx->event_list, event_entry) { if (event->state != PERF_EVENT_STATE_ACTIVE) @@ -2381,13 +2386,17 @@ static void perf_adjust_freq_unthr_context(struct perf_event_context *ctx, /* * restart the event * reload only if value has changed + * we have stopped the event so tell that + * to perf_adjust_period() to avoid stopping it + * twice. */ if (delta > 0) - perf_adjust_period(event, period, delta); + perf_adjust_period(event, period, delta, false); event->pmu->start(event, delta > 0 ? PERF_EF_RELOAD : 0); } + perf_pmu_enable(ctx->pmu); raw_spin_unlock(&ctx->lock); } @@ -4567,7 +4576,7 @@ static int __perf_event_overflow(struct perf_event *event, hwc->freq_time_stamp = now; if (delta > 0 && delta < 2*TICK_NSEC) - perf_adjust_period(event, delta, hwc->last_period); + perf_adjust_period(event, delta, hwc->last_period, true); } /* diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c index b0309f7..3330022 100644 --- a/kernel/events/hw_breakpoint.c +++ b/kernel/events/hw_breakpoint.c @@ -658,10 +658,10 @@ int __init init_hw_breakpoint(void) err_alloc: for_each_possible_cpu(err_cpu) { - if (err_cpu == cpu) - break; for (i = 0; i < TYPE_MAX; i++) kfree(per_cpu(nr_task_bp_pinned[i], cpu)); + if (err_cpu == cpu) + break; } return -ENOMEM; diff --git a/kernel/fork.c b/kernel/fork.c index 1b2ef3c..e2cd3e2 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -66,6 +66,7 @@ #include <linux/user-return-notifier.h> #include <linux/oom.h> #include <linux/khugepaged.h> +#include <linux/signalfd.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> @@ -910,7 +911,7 @@ static int copy_io(unsigned long clone_flags, struct task_struct *tsk) return -ENOMEM; new_ioc->ioprio = ioc->ioprio; - put_io_context(new_ioc, NULL); + put_io_context(new_ioc); } #endif return 0; @@ -935,8 +936,10 @@ static int copy_sighand(unsigned long clone_flags, struct task_struct *tsk) void __cleanup_sighand(struct sighand_struct *sighand) { - if (atomic_dec_and_test(&sighand->count)) + if (atomic_dec_and_test(&sighand->count)) { + signalfd_cleanup(sighand); kmem_cache_free(sighand_cachep, sighand); + } } diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c index 342d8f4..0119b9d 100644 --- a/kernel/irq/autoprobe.c +++ b/kernel/irq/autoprobe.c @@ -53,7 +53,7 @@ unsigned long probe_irq_on(void) if (desc->irq_data.chip->irq_set_type) desc->irq_data.chip->irq_set_type(&desc->irq_data, IRQ_TYPE_PROBE); - irq_startup(desc); + irq_startup(desc, false); } raw_spin_unlock_irq(&desc->lock); } @@ -70,7 +70,7 @@ unsigned long probe_irq_on(void) raw_spin_lock_irq(&desc->lock); if (!desc->action && irq_settings_can_probe(desc)) { desc->istate |= IRQS_AUTODETECT | IRQS_WAITING; - if (irq_startup(desc)) + if (irq_startup(desc, false)) desc->istate |= IRQS_PENDING; } raw_spin_unlock_irq(&desc->lock); diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index fc41824..838687e 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -159,19 +159,22 @@ static void irq_state_set_masked(struct irq_desc *desc) irqd_set(&desc->irq_data, IRQD_IRQ_MASKED); } -int irq_startup(struct irq_desc *desc) +int irq_startup(struct irq_desc *desc, bool resend) { + int ret = 0; + irq_state_clr_disabled(desc); desc->depth = 0; if (desc->irq_data.chip->irq_startup) { - int ret = desc->irq_data.chip->irq_startup(&desc->irq_data); + ret = desc->irq_data.chip->irq_startup(&desc->irq_data); irq_state_clr_masked(desc); - return ret; + } else { + irq_enable(desc); } - - irq_enable(desc); - return 0; + if (resend) + check_irq_resend(desc, desc->irq_data.irq); + return ret; } void irq_shutdown(struct irq_desc *desc) @@ -332,6 +335,24 @@ out_unlock: } EXPORT_SYMBOL_GPL(handle_simple_irq); +/* + * Called unconditionally from handle_level_irq() and only for oneshot + * interrupts from handle_fasteoi_irq() + */ +static void cond_unmask_irq(struct irq_desc *desc) +{ + /* + * We need to unmask in the following cases: + * - Standard level irq (IRQF_ONESHOT is not set) + * - Oneshot irq which did not wake the thread (caused by a + * spurious interrupt or a primary handler handling it + * completely). + */ + if (!irqd_irq_disabled(&desc->irq_data) && + irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) + unmask_irq(desc); +} + /** * handle_level_irq - Level type irq handler * @irq: the interrupt number @@ -364,8 +385,8 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc) handle_irq_event(desc); - if (!irqd_irq_disabled(&desc->irq_data) && !(desc->istate & IRQS_ONESHOT)) - unmask_irq(desc); + cond_unmask_irq(desc); + out_unlock: raw_spin_unlock(&desc->lock); } @@ -419,6 +440,9 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc) preflow_handler(desc); handle_irq_event(desc); + if (desc->istate & IRQS_ONESHOT) + cond_unmask_irq(desc); + out_eoi: desc->irq_data.chip->irq_eoi(&desc->irq_data); out_unlock: @@ -627,7 +651,7 @@ __irq_set_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, irq_settings_set_noprobe(desc); irq_settings_set_norequest(desc); irq_settings_set_nothread(desc); - irq_startup(desc); + irq_startup(desc, true); } out: irq_put_desc_busunlock(desc, flags); diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h index b795231..40378ff 100644 --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -67,7 +67,7 @@ extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq, extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp); extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume); -extern int irq_startup(struct irq_desc *desc); +extern int irq_startup(struct irq_desc *desc, bool resend); extern void irq_shutdown(struct irq_desc *desc); extern void irq_enable(struct irq_desc *desc); extern void irq_disable(struct irq_desc *desc); diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index a9a9dbe..32313c0 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -1027,7 +1027,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) desc->istate |= IRQS_ONESHOT; if (irq_settings_can_autoenable(desc)) - irq_startup(desc); + irq_startup(desc, true); else /* Undo nested disables: */ desc->depth = 1; diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 29f5b65..9788c0e 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -1673,8 +1673,12 @@ static int __kprobes pre_handler_kretprobe(struct kprobe *p, ri->rp = rp; ri->task = current; - if (rp->entry_handler && rp->entry_handler(ri, regs)) + if (rp->entry_handler && rp->entry_handler(ri, regs)) { + raw_spin_lock_irqsave(&rp->lock, flags); + hlist_add_head(&ri->hlist, &rp->free_instances); + raw_spin_unlock_irqrestore(&rp->lock, flags); return 0; + } arch_prepare_kretprobe(ri, regs); diff --git a/kernel/params.c b/kernel/params.c index 32ee043..4bc965d 100644 --- a/kernel/params.c +++ b/kernel/params.c @@ -97,7 +97,8 @@ static int parse_one(char *param, for (i = 0; i < num_params; i++) { if (parameq(param, params[i].name)) { /* No one handled NULL, so do it here. */ - if (!val && params[i].ops->set != param_set_bool) + if (!val && params[i].ops->set != param_set_bool + && params[i].ops->set != param_set_bint) return -EINVAL; pr_debug("They are equal! Calling %p\n", params[i].ops->set); diff --git a/kernel/pid.c b/kernel/pid.c index ce8e00d..9f08dfa 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -543,12 +543,12 @@ struct pid *find_ge_pid(int nr, struct pid_namespace *ns) */ void __init pidhash_init(void) { - int i, pidhash_size; + unsigned int i, pidhash_size; pid_hash = alloc_large_system_hash("PID", sizeof(*pid_hash), 0, 18, HASH_EARLY | HASH_SMALL, &pidhash_shift, NULL, 4096); - pidhash_size = 1 << pidhash_shift; + pidhash_size = 1U << pidhash_shift; for (i = 0; i < pidhash_size; i++) INIT_HLIST_HEAD(&pid_hash[i]); diff --git a/kernel/power/power.h b/kernel/power/power.h index 0c4defe..21724ee 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -231,8 +231,28 @@ extern int pm_test_level; #ifdef CONFIG_SUSPEND_FREEZER static inline int suspend_freeze_processes(void) { - int error = freeze_processes(); - return error ? : freeze_kernel_threads(); + int error; + + error = freeze_processes(); + + /* + * freeze_processes() automatically thaws every task if freezing + * fails. So we need not do anything extra upon error. + */ + if (error) + goto Finish; + + error = freeze_kernel_threads(); + + /* + * freeze_kernel_threads() thaws only kernel threads upon freezing + * failure. So we have to thaw the userspace tasks ourselves. + */ + if (error) + thaw_processes(); + + Finish: + return error; } static inline void suspend_thaw_processes(void) diff --git a/kernel/power/process.c b/kernel/power/process.c index eeca003..7e42645 100644 --- a/kernel/power/process.c +++ b/kernel/power/process.c @@ -143,7 +143,10 @@ int freeze_processes(void) /** * freeze_kernel_threads - Make freezable kernel threads go to the refrigerator. * - * On success, returns 0. On failure, -errno and system is fully thawed. + * On success, returns 0. On failure, -errno and only the kernel threads are + * thawed, so as to give a chance to the caller to do additional cleanups + * (if any) before thawing the userspace tasks. So, it is the responsibility + * of the caller to thaw the userspace tasks, when the time is right. */ int freeze_kernel_threads(void) { @@ -159,7 +162,7 @@ int freeze_kernel_threads(void) BUG_ON(in_atomic()); if (error) - thaw_processes(); + thaw_kernel_threads(); return error; } diff --git a/kernel/power/user.c b/kernel/power/user.c index e5a21a8..3e10007 100644 --- a/kernel/power/user.c +++ b/kernel/power/user.c @@ -249,13 +249,15 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd, } pm_restore_gfp_mask(); error = hibernation_snapshot(data->platform_support); - if (!error) { + if (error) { + thaw_kernel_threads(); + } else { error = put_user(in_suspend, (int __user *)arg); if (!error && !freezer_test_done) data->ready = 1; if (freezer_test_done) { freezer_test_done = false; - thaw_processes(); + thaw_kernel_threads(); } } break; diff --git a/kernel/relay.c b/kernel/relay.c index 4335e1d..ab56a17 100644 --- a/kernel/relay.c +++ b/kernel/relay.c @@ -164,10 +164,14 @@ depopulate: */ static struct rchan_buf *relay_create_buf(struct rchan *chan) { - struct rchan_buf *buf = kzalloc(sizeof(struct rchan_buf), GFP_KERNEL); - if (!buf) + struct rchan_buf *buf; + + if (chan->n_subbufs > UINT_MAX / sizeof(size_t *)) return NULL; + buf = kzalloc(sizeof(struct rchan_buf), GFP_KERNEL); + if (!buf) + return NULL; buf->padding = kmalloc(chan->n_subbufs * sizeof(size_t *), GFP_KERNEL); if (!buf->padding) goto free_buf; @@ -574,6 +578,8 @@ struct rchan *relay_open(const char *base_filename, if (!(subbuf_size && n_subbufs)) return NULL; + if (subbuf_size > UINT_MAX / n_subbufs) + return NULL; chan = kzalloc(sizeof(struct rchan), GFP_KERNEL); if (!chan) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 112c682..6c41ba4 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1932,7 +1932,6 @@ static void finish_task_switch(struct rq *rq, struct task_struct *prev) local_irq_enable(); #endif /* __ARCH_WANT_INTERRUPTS_ON_CTXSW */ finish_lock_switch(rq, prev); - trace_sched_stat_sleeptime(current, rq->clock); fire_sched_in_preempt_notifiers(current); if (mm) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 423547a..fd974fa 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1003,6 +1003,7 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se) if (unlikely(delta > se->statistics.sleep_max)) se->statistics.sleep_max = delta; + se->statistics.sleep_start = 0; se->statistics.sum_sleep_runtime += delta; if (tsk) { @@ -1019,6 +1020,7 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se) if (unlikely(delta > se->statistics.block_max)) se->statistics.block_max = delta; + se->statistics.block_start = 0; se->statistics.sum_sleep_runtime += delta; if (tsk) { |