genirq/proc: Simplify irqdesc::kstat_irqs handling further

Interrupts which have no action and chained interrupts can be
ignored due to the following reasons (as per tglx's comment):

  1) Interrupts which have no action are completely uninteresting as
     there is no real information attached.

  2) Chained interrupts do not have a count at all.

So there is no point to evaluate the number of accounted interrupts before
checking for non-requested or chained interrupts.

Remove the any_count logic and simply check whether the interrupt
descriptor has the kstat_irqs member populated.

[ tglx: Adapted to upstream changes ]

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Adrian Huang <ahuang12@lenovo.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Jiwei Sun <sunjw10@lenovo.com>
Link: https://lore.kernel.org/r/20240515100632.1419-1-ahuang12@lenovo.com
Link: https://lore.kernel.org/lkml/87h6f0knau.ffs@tglx/

diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 5c320c3f10a7462e7165ee3060b3c7efbb1b5af4..8cccdf40725af5a83aeb19d15c0979882992b54f 100644 (file)
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -461,10 +461,10 @@ int show_interrupts(struct seq_file *p, void *v)
 {
        static int prec;
 
-       unsigned long flags, any_count = 0;
        int i = *(loff_t *) v, j;
        struct irqaction *action;
        struct irq_desc *desc;
+       unsigned long flags;
 
        if (i > ACTUAL_NR_IRQS)
                return 0;
@@ -488,10 +488,7 @@ int show_interrupts(struct seq_file *p, void *v)
        if (!desc || irq_settings_is_hidden(desc))
                goto outsparse;
 
-       if (desc->kstat_irqs)
-               any_count = kstat_irqs_desc(desc, cpu_online_mask);
-
-       if ((!desc->action || irq_desc_is_chained(desc)) && !any_count)
+       if (!desc->action || irq_desc_is_chained(desc) || !desc->kstat_irqs)
                goto outsparse;
 
        seq_printf(p, "%*d: ", prec, i);