From 8dd79cb1051723496bbdcea2247e49567cedb3ac Mon Sep 17 00:00:00 2001
From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Thu, 15 May 2008 16:52:39 +0200
Subject: [PATCH] [S390] show_interrupts: prevent cpu hotplug when walking
cpu_online_map.
Surround all the code withing show_interrupts() with
get/put_online_cpus() to prevent strange results wrt cpu hotplug.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---
arch/s390/kernel/irq.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c
index c59a86dca5849..e7c5bfb7c755a 100644
--- a/arch/s390/kernel/irq.c
+++ b/arch/s390/kernel/irq.c
@@ -25,6 +25,7 @@ int show_interrupts(struct seq_file *p, void *v)
static const char *intrclass_names[] = { "EXT", "I/O", };
int i = *(loff_t *) v, j;
+ get_online_cpus();
if (i == 0) {
seq_puts(p, " ");
for_each_online_cpu(j)
@@ -43,7 +44,7 @@ int show_interrupts(struct seq_file *p, void *v)
seq_putc(p, '\n');
}
-
+ put_online_cpus();
return 0;
}
--
GitLab