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Commit 52b17329 authored by Yinghai Lu's avatar Yinghai Lu Committed by Ingo Molnar
Browse files

x86_64: make /proc/interrupts work with dyn irq_desc 



loop with irq_desc list

Signed-off-by: default avatarYinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent a2f9f438

arch/x86/kernel/irq_64.c

+24 −7
Original line number Diff line number Diff line
@@ -70,9 +70,27 @@ static inline void stack_overflow_check(struct pt_regs *regs) 


int show_interrupts(struct seq_file *p, void *v)

{

	int i = *(loff_t *) v, j;

	int i, j;

	struct irqaction * action;

	unsigned long flags;

	unsigned int entries;

	struct irq_desc *desc;

	int tail = 0;



#ifdef CONFIG_HAVE_SPARSE_IRQ

	desc = (struct irq_desc *)v;

	entries = -1U;

	i = desc->irq;

	if (!desc->next)

		tail = 1;

#else

	entries = nr_irqs - 1;

	i = *(loff_t *) v;

	if (i == nr_irqs)

		tail = 1;

	else

		desc = irq_to_desc(i);

#endif



	if (i == 0) {

		seq_printf(p, "           ");
@@ -81,12 +99,8 @@ int show_interrupts(struct seq_file *p, void *v) 
		seq_putc(p, '\n');

	}



	if (i < nr_irqs) {

	if (i <= entries) {

		unsigned any_count = 0;

		struct irq_desc *desc = irq_to_desc(i);



		if (!desc)

			return 0;



		spin_lock_irqsave(&desc->lock, flags);

#ifndef CONFIG_SMP
@@ -116,7 +130,9 @@ int show_interrupts(struct seq_file *p, void *v) 
		seq_putc(p, '\n');

skip:

		spin_unlock_irqrestore(&desc->lock, flags);

	} else if (i == nr_irqs) {

	}



	if (tail) {

		seq_printf(p, "NMI: ");

		for_each_online_cpu(j)

			seq_printf(p, "%10u ", cpu_pda(j)->__nmi_count);
@@ -155,6 +171,7 @@ skip: 
		seq_printf(p, "  Spurious interrupts\n");

		seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));

	}



	return 0;

}

fs/proc/proc_misc.c

+24 −4
Original line number Diff line number Diff line
@@ -645,15 +645,36 @@ static const struct file_operations proc_stat_operations = { 
 */

static void *int_seq_start(struct seq_file *f, loff_t *pos)

{

#ifdef CONFIG_HAVE_SPARSE_IRQ

	struct irq_desc *desc;

	int irq;

	int count = *pos;



	for_each_irq_desc(irq, desc) {

		if (count-- == 0)

			return desc;

	}



	return NULL;

#else

	return (*pos <= nr_irqs) ? pos : NULL;

#endif

}





static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)

{

#ifdef CONFIG_HAVE_SPARSE_IRQ

	struct irq_desc *desc;



	desc = ((struct irq_desc *)v)->next;

	(*pos)++;

	if (*pos > nr_irqs)

		return NULL;

	return pos;



	return desc;

#else

	(*pos)++;

	return (*pos <= nr_irqs) ? pos : NULL;

#endif

}



static void int_seq_stop(struct seq_file *f, void *v)
@@ -661,7 +682,6 @@ static void int_seq_stop(struct seq_file *f, void *v) 
	/* Nothing to do */

}





static const struct seq_operations int_seq_ops = {

	.start = int_seq_start,

	.next  = int_seq_next,