s390/setup: use virtual address for STSI instruction

Provide virtual memory pointer for system-information block.
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/kernel/setup.c

@@ -879,14 +879,12 @@ static void __init setup_randomness(void)
 {
 	struct sysinfo_3_2_2 *vmms;
 
-	vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE,
-							    PAGE_SIZE);
+	vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
 	if (!vmms)
 		panic("Failed to allocate memory for sysinfo structure\n");
-
 	if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
 		add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
-	memblock_free((unsigned long) vmms, PAGE_SIZE);
+	memblock_free_ptr(vmms, PAGE_SIZE);
 }
 
 /*