From: Marcelo Tosatti <mtosatti@redhat.com>
Date: Tue, 19 Feb 2013 01:58:14 +0000 (-0300)
Subject: x86: pvclock kvm: align allocation size to page size
X-Git-Tag: v3.8.3~29
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=054489e166e385af36a4c3b1928f230663da8f02;p=karo-tx-linux.git

x86: pvclock kvm: align allocation size to page size

commit ed55705dd5008b408c48a8459b8b34b01f3de985 upstream.

To match whats mapped via vsyscalls to userspace.

Reported-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index 220a360010f8..5bedbdddf1f2 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -218,6 +218,9 @@ static void kvm_shutdown(void)
 void __init kvmclock_init(void)
 {
 	unsigned long mem;
+	int size;
+
+	size = PAGE_ALIGN(sizeof(struct pvclock_vsyscall_time_info)*NR_CPUS);
 
 	if (!kvm_para_available())
 		return;
@@ -231,16 +234,14 @@ void __init kvmclock_init(void)
 	printk(KERN_INFO "kvm-clock: Using msrs %x and %x",
 		msr_kvm_system_time, msr_kvm_wall_clock);
 
-	mem = memblock_alloc(sizeof(struct pvclock_vsyscall_time_info)*NR_CPUS,
-			     PAGE_SIZE);
+	mem = memblock_alloc(size, PAGE_SIZE);
 	if (!mem)
 		return;
 	hv_clock = __va(mem);
 
 	if (kvm_register_clock("boot clock")) {
 		hv_clock = NULL;
-		memblock_free(mem,
-			sizeof(struct pvclock_vsyscall_time_info)*NR_CPUS);
+		memblock_free(mem, size);
 		return;
 	}
 	pv_time_ops.sched_clock = kvm_clock_read;
@@ -275,7 +276,7 @@ int __init kvm_setup_vsyscall_timeinfo(void)
 	struct pvclock_vcpu_time_info *vcpu_time;
 	unsigned int size;
 
-	size = sizeof(struct pvclock_vsyscall_time_info)*NR_CPUS;
+	size = PAGE_ALIGN(sizeof(struct pvclock_vsyscall_time_info)*NR_CPUS);
 
 	preempt_disable();
 	cpu = smp_processor_id();