#include <linux/delay.h>
#include <asm/uaccess.h>
#include <asm/io_apic.h>
+#include <asm/idle.h>
atomic_t irq_err_count;
#ifdef CONFIG_X86_IO_APIC
#endif
#endif
+#ifdef CONFIG_DEBUG_STACKOVERFLOW
+/*
+ * Probabilistic stack overflow check:
+ *
+ * Only check the stack in process context, because everything else
+ * runs on the big interrupt stacks. Checking reliably is too expensive,
+ * so we just check from interrupts.
+ */
+static inline void stack_overflow_check(struct pt_regs *regs)
+{
+ u64 curbase = (u64) current->thread_info;
+ static unsigned long warned = -60*HZ;
+
+ if (regs->rsp >= curbase && regs->rsp <= curbase + THREAD_SIZE &&
+ regs->rsp < curbase + sizeof(struct thread_info) + 128 &&
+ time_after(jiffies, warned + 60*HZ)) {
+ printk("do_IRQ: %s near stack overflow (cur:%Lx,rsp:%lx)\n",
+ current->comm, curbase, regs->rsp);
+ show_stack(NULL,NULL);
+ warned = jiffies;
+ }
+}
+#endif
+
/*
* Generic, controller-independent functions:
*/
if (i == 0) {
seq_printf(p, " ");
- for (j=0; j<NR_CPUS; j++)
- if (cpu_online(j))
- seq_printf(p, "CPU%d ",j);
+ for_each_online_cpu(j)
+ seq_printf(p, "CPU%-8d",j);
seq_putc(p, '\n');
}
#ifndef CONFIG_SMP
seq_printf(p, "%10u ", kstat_irqs(i));
#else
- for (j=0; j<NR_CPUS; j++)
- if (cpu_online(j))
- seq_printf(p, "%10u ",
- kstat_cpu(j).irqs[i]);
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
#endif
seq_printf(p, " %14s", irq_desc[i].handler->typename);
spin_unlock_irqrestore(&irq_desc[i].lock, flags);
} else if (i == NR_IRQS) {
seq_printf(p, "NMI: ");
- for (j = 0; j < NR_CPUS; j++)
- if (cpu_online(j))
- seq_printf(p, "%10u ", cpu_pda[j].__nmi_count);
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", cpu_pda(j)->__nmi_count);
seq_putc(p, '\n');
#ifdef CONFIG_X86_LOCAL_APIC
seq_printf(p, "LOC: ");
- for (j = 0; j < NR_CPUS; j++)
- if (cpu_online(j))
- seq_printf(p, "%10u ", cpu_pda[j].apic_timer_irqs);
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", cpu_pda(j)->apic_timer_irqs);
seq_putc(p, '\n');
#endif
seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
/* high bits used in ret_from_ code */
unsigned irq = regs->orig_rax & 0xff;
+ exit_idle();
irq_enter();
- BUG_ON(irq > 256);
-
+#ifdef CONFIG_DEBUG_STACKOVERFLOW
+ stack_overflow_check(regs);
+#endif
__do_IRQ(irq, regs);
irq_exit();