diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/printk.c | 22 | ||||
| -rw-r--r-- | kernel/resource.c | 51 | ||||
| -rw-r--r-- | kernel/softirq.c | 13 | ||||
| -rw-r--r-- | kernel/time/tick-sched.c | 2 | ||||
| -rw-r--r-- | kernel/timer.c | 1 |
5 files changed, 73 insertions, 16 deletions
diff --git a/kernel/printk.c b/kernel/printk.c index fbd94bd..6341af7 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -577,9 +577,6 @@ static int have_callable_console(void) * @fmt: format string * * This is printk(). It can be called from any context. We want it to work. - * Be aware of the fact that if oops_in_progress is not set, we might try to - * wake klogd up which could deadlock on runqueue lock if printk() is called - * from scheduler code. * * We try to grab the console_sem. If we succeed, it's easy - we log the output and * call the console drivers. If we fail to get the semaphore we place the output @@ -984,10 +981,25 @@ int is_console_locked(void) return console_locked; } -void wake_up_klogd(void) +static DEFINE_PER_CPU(int, printk_pending); + +void printk_tick(void) { - if (!oops_in_progress && waitqueue_active(&log_wait)) + if (__get_cpu_var(printk_pending)) { + __get_cpu_var(printk_pending) = 0; wake_up_interruptible(&log_wait); + } +} + +int printk_needs_cpu(int cpu) +{ + return per_cpu(printk_pending, cpu); +} + +void wake_up_klogd(void) +{ + if (waitqueue_active(&log_wait)) + __raw_get_cpu_var(printk_pending) = 1; } /** diff --git a/kernel/resource.c b/kernel/resource.c index f193d6e..4089d12 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -38,10 +38,6 @@ EXPORT_SYMBOL(iomem_resource); static DEFINE_RWLOCK(resource_lock); -#ifdef CONFIG_PROC_FS - -enum { MAX_IORES_LEVEL = 5 }; - static void *r_next(struct seq_file *m, void *v, loff_t *pos) { struct resource *p = v; @@ -53,6 +49,10 @@ static void *r_next(struct seq_file *m, void *v, loff_t *pos) return p->sibling; } +#ifdef CONFIG_PROC_FS + +enum { MAX_IORES_LEVEL = 5 }; + static void *r_start(struct seq_file *m, loff_t *pos) __acquires(resource_lock) { @@ -549,13 +549,9 @@ static void __init __reserve_region_with_split(struct resource *root, } if (!res) { - printk(KERN_DEBUG " __reserve_region_with_split: (%s) [%llx, %llx], res: (%s) [%llx, %llx]\n", - conflict->name, conflict->start, conflict->end, - name, start, end); - /* failed, split and try again */ - /* conflict coverred whole area */ + /* conflict covered whole area */ if (conflict->start <= start && conflict->end >= end) return; @@ -832,3 +828,40 @@ static int __init reserve_setup(char *str) } __setup("reserve=", reserve_setup); + +/* + * Check if the requested addr and size spans more than any slot in the + * iomem resource tree. + */ +int iomem_map_sanity_check(resource_size_t addr, unsigned long size) +{ + struct resource *p = &iomem_resource; + int err = 0; + loff_t l; + + read_lock(&resource_lock); + for (p = p->child; p ; p = r_next(NULL, p, &l)) { + /* + * We can probably skip the resources without + * IORESOURCE_IO attribute? + */ + if (p->start >= addr + size) + continue; + if (p->end < addr) + continue; + if (p->start <= addr && (p->end >= addr + size - 1)) + continue; + printk(KERN_WARNING "resource map sanity check conflict: " + "0x%llx 0x%llx 0x%llx 0x%llx %s\n", + (unsigned long long)addr, + (unsigned long long)(addr + size - 1), + (unsigned long long)p->start, + (unsigned long long)p->end, + p->name); + err = -1; + break; + } + read_unlock(&resource_lock); + + return err; +} diff --git a/kernel/softirq.c b/kernel/softirq.c index c506f26..be7a829 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -46,7 +46,7 @@ irq_cpustat_t irq_stat[NR_CPUS] ____cacheline_aligned; EXPORT_SYMBOL(irq_stat); #endif -static struct softirq_action softirq_vec[32] __cacheline_aligned_in_smp; +static struct softirq_action softirq_vec[NR_SOFTIRQS] __cacheline_aligned_in_smp; static DEFINE_PER_CPU(struct task_struct *, ksoftirqd); @@ -205,7 +205,18 @@ restart: do { if (pending & 1) { + int prev_count = preempt_count(); + h->action(h); + + if (unlikely(prev_count != preempt_count())) { + printk(KERN_ERR "huh, entered softirq %d %p" + "with preempt_count %08x," + " exited with %08x?\n", h - softirq_vec, + h->action, prev_count, preempt_count()); + preempt_count() = prev_count; + } + rcu_bh_qsctr_inc(cpu); } h++; diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index a4d2193..b711ffc 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -270,7 +270,7 @@ void tick_nohz_stop_sched_tick(int inidle) next_jiffies = get_next_timer_interrupt(last_jiffies); delta_jiffies = next_jiffies - last_jiffies; - if (rcu_needs_cpu(cpu)) + if (rcu_needs_cpu(cpu) || printk_needs_cpu(cpu)) delta_jiffies = 1; /* * Do not stop the tick, if we are only one off diff --git a/kernel/timer.c b/kernel/timer.c index 03bc7f1..510fe69 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -978,6 +978,7 @@ void update_process_times(int user_tick) run_local_timers(); if (rcu_pending(cpu)) rcu_check_callbacks(cpu, user_tick); + printk_tick(); scheduler_tick(); run_posix_cpu_timers(p); } |
