From: Adrian Huang <ahuang12@xxxxxxxxxx> Current approach blindly iterates the irq number until the number is greater than 'nr_irqs', and checks if each irq is allocated. It is inefficient if the big hole (the last allocated irq number to nr_irqs) is available in the system. The solution is to try jumping over the unallocated irq hole when an unallocated irq is detected. Tested-by: Jiwei Sun <sunjw10@xxxxxxxxxx> Signed-off-by: Adrian Huang <ahuang12@xxxxxxxxxx> --- fs/proc/interrupts.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/proc/interrupts.c b/fs/proc/interrupts.c index cb0edc7cbf09..111ea8a3c553 100644 --- a/fs/proc/interrupts.c +++ b/fs/proc/interrupts.c @@ -19,6 +19,12 @@ static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos) (*pos)++; if (*pos > nr_irqs) return NULL; + + rcu_read_lock(); + if (!irq_to_desc(*pos)) + *pos = irq_get_next_irq(*pos); + rcu_read_unlock(); + return pos; } -- 2.25.1
