From 6260f6427c944279f8aca108140db900699a30de Mon Sep 17 00:00:00 2001 From: Pingfan Liu Date: Fri, 22 Apr 2022 18:02:12 +0800 Subject: [PATCH] s390/irq: utilize RCU instead of irq_lock_sparse() in show_msi_interrupt() As demonstrated by commit 74bdf7815dfb ("genirq: Speedup show_interrupts()"), irq_desc can be accessed safely in RCU read section. Hence here resorting to rcu read lock to get rid of irq_lock_sparse(). Signed-off-by: Pingfan Liu Link: https://lore.kernel.org/r/20220422100212.22666-1-kernelfans@gmail.com Signed-off-by: Heiko Carstens --- arch/s390/kernel/irq.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c index 3033f616e2569..45393919fe615 100644 --- a/arch/s390/kernel/irq.c +++ b/arch/s390/kernel/irq.c @@ -205,7 +205,7 @@ static void show_msi_interrupt(struct seq_file *p, int irq) unsigned long flags; int cpu; - irq_lock_sparse(); + rcu_read_lock(); desc = irq_to_desc(irq); if (!desc) goto out; @@ -224,7 +224,7 @@ static void show_msi_interrupt(struct seq_file *p, int irq) seq_putc(p, '\n'); raw_spin_unlock_irqrestore(&desc->lock, flags); out: - irq_unlock_sparse(); + rcu_read_unlock(); } /*