linux-kernel - Re: Why do we still have 32 bit counters? Interrupt counters overflow within 50 days

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Message-ID: <alpine.DEB.2.11.1410030856250.9852@gentwo.org>
Date:	Fri, 3 Oct 2014 09:04:40 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Richard Cochran <richardcochran@...il.com>
cc:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org
Subject: Re: Why do we still have 32 bit counters? Interrupt counters overflow
 within 50 days

> Fine, but the subject line sounded different.

Hmmm.... Found a bug. We need this patch on top

Subject: Fix allocpercpu

Must allocate unsigned long not int.

Signed-off-by: Christoph Lameter <cl@...ux.com>

Index: linux/kernel/irq/irqdesc.c
===================================================================
--- linux.orig/kernel/irq/irqdesc.c
+++ linux/kernel/irq/irqdesc.c
@@ -140,7 +140,7 @@ static struct irq_desc *alloc_desc(int i
 	if (!desc)
 		return NULL;
 	/* allocate based on nr_cpu_ids */
-	desc->kstat_irqs = alloc_percpu(unsigned int);
+	desc->kstat_irqs = alloc_percpu(unsigned long);
 	if (!desc->kstat_irqs)
 		goto err_desc;

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