From: Jens Freimann <jfrei@linux.vnet.ibm.com>
Date: Tue, 18 Mar 2014 15:34:18 +0000 (+0100)
Subject: KVM: s390: fix calculation of idle_mask array size
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=609433fbed4f25e11e8b058ab7e9478b212879a9;p=linux-beck.git

KVM: s390: fix calculation of idle_mask array size

We need BITS_TO_LONGS, not sizeof(long) to calculate
the correct size.

idle_mask is a bitmask, each bit representing the state
of a cpu. The desired outcome is an array of unsigned long
fields that can fit KVM_MAX_VCPUS bits. We should not use
sizeof(long) which returnes the size in bytes, but BITS_TO_LONGS

Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 734d302ba389..c36cd35e03f3 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -213,8 +213,7 @@ struct kvm_s390_float_interrupt {
 	struct list_head list;
 	atomic_t active;
 	int next_rr_cpu;
-	unsigned long idle_mask[(KVM_MAX_VCPUS + sizeof(long) - 1)
-				/ sizeof(long)];
+	unsigned long idle_mask[BITS_TO_LONGS(KVM_MAX_VCPUS)];
 	unsigned int irq_count;
 };