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s390/irq: utilize RCU instead of irq_lock_sparse() in show_msi_interrupt()

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As demonstrated by commit 74bdf7815d ("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 <kernelfans@gmail.com>
Link: https://lore.kernel.org/r/20220422100212.22666-1-kernelfans@gmail.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Pingfan Liu 2022-04-22 18:02:12 +08:00 committed by Heiko Carstens
parent 9a07731702
commit 6260f6427c
1 changed files with 2 additions and 2 deletions
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4
arch/s390/kernel/irq.c
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@ -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();
}
/*