[Devel] [PATCH RHEL9 COMMIT] irq/proc: add cond_resched to show_interrupts

[Konstantin Khorenko]

The commit is pushed to "branch-rh9-5.14.0-425.vz9.60.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh9-5.14.0-425.vz9.60.7
------>
commit 1522f5e1677db9b1bbfdc1ca7daa04979f6d71be
Author: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
Date:   Fri Jun 21 15:45:47 2024 +0800

    irq/proc: add cond_resched to show_interrupts
    
    This should decrease the possibility to trigger soft-lockup in
    show_interrupts(). E.g. in case waiting for irq_desc->lock spinlock adds
    up across several iterations over irqs to more than 2*watchdog_thresh.
    
    https://pmc.acronis.work/browse/VSTOR-88194
    
    Signed-off-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
---
 kernel/irq/proc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 623b8136e9af..7b4c8ff02e57 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -533,6 +533,8 @@ int show_interrupts(struct seq_file *p, void *v)
 	raw_spin_unlock_irqrestore(&desc->lock, flags);
 outsparse:
 	rcu_read_unlock();
+
+	cond_resched();
 	return 0;
 }
 #endif