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genirq: Implement generic irq_show_interrupts()
All archs implement show_interrupts() in more or less the same way. That's tons of duplicated code with different bugs with no value. Implement a generic version and deprecate show_interrupts() Unfortunately we need some ifdeffery for !GENERIC_HARDIRQ archs. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -671,6 +671,7 @@ static inline void init_irq_proc(void)
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struct seq_file;
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int show_interrupts(struct seq_file *p, void *v);
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int arch_show_interrupts(struct seq_file *p, int prec);
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extern int early_irq_init(void);
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extern int arch_probe_nr_irqs(void);
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@ -20,6 +20,9 @@ config HAVE_SPARSE_IRQ
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config GENERIC_IRQ_PROBE
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def_bool n
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config GENERIC_IRQ_SHOW
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def_bool n
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config GENERIC_PENDING_IRQ
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def_bool n
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@ -11,6 +11,7 @@
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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#include "internals.h"
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@ -357,3 +358,65 @@ void init_irq_proc(void)
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}
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}
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#ifdef CONFIG_GENERIC_IRQ_SHOW
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int __weak arch_show_interrupts(struct seq_file *p, int prec)
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{
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return 0;
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}
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int show_interrupts(struct seq_file *p, void *v)
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{
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static int prec;
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unsigned long flags, any_count = 0;
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int i = *(loff_t *) v, j;
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struct irqaction *action;
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struct irq_desc *desc;
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if (i > nr_irqs)
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return 0;
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if (i == nr_irqs)
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return arch_show_interrupts(p, prec);
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/* print header and calculate the width of the first column */
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if (i == 0) {
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for (prec = 3, j = 1000; prec < 10 && j <= nr_irqs; ++prec)
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j *= 10;
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seq_printf(p, "%*s", prec + 8, "");
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for_each_online_cpu(j)
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seq_printf(p, "CPU%-8d", j);
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seq_putc(p, '\n');
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}
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desc = irq_to_desc(i);
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if (!desc)
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return 0;
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raw_spin_lock_irqsave(&desc->lock, flags);
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for_each_online_cpu(j)
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any_count |= kstat_irqs_cpu(i, j);
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action = desc->action;
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if (!action && !any_count)
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goto out;
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seq_printf(p, "%*d: ", prec, i);
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for_each_online_cpu(j)
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seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
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seq_printf(p, " %8s", desc->irq_data.chip->name);
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seq_printf(p, "-%-8s", desc->name);
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if (action) {
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seq_printf(p, " %s", action->name);
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while ((action = action->next) != NULL)
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seq_printf(p, ", %s", action->name);
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}
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seq_putc(p, '\n');
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out:
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raw_spin_unlock_irqrestore(&desc->lock, flags);
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return 0;
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}
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#endif
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