x86: pvclock kvm: align allocation size to page size

[Marcelo Tosatti]

To match whats mapped via vsyscalls to userspace.

Reported-by: Peter Hurley <pe...@hurleysoftware.com>
Signed-off-by: Marcelo Tosatti <mtosa...@redhat.com>

diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index 220a360..5bedbdd 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();


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