xen/x86: Use %*pb[l] instead of cpumask_scn{,list}printf()

This removes all use of keyhandler_scratch as a bounce-buffer for the rendered
string.

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

xen/arch/x86/cpu/mcheck/mce.c

@@ -535,9 +535,12 @@ void mcheck_cmn_handler(const struct cpu_user_regs *regs)
             mc_panic("MCE: No CPU found valid MCE, need reset");
         if ( !cpumask_empty(&mce_fatal_cpus) )
         {
-            char *ebufp, ebuf[96] = "MCE: Fatal error happened on CPUs ";
-            ebufp = ebuf + strlen(ebuf);
-            cpumask_scnprintf(ebufp, 95 - strlen(ebuf), &mce_fatal_cpus);
+            char ebuf[96];
+
+            snprintf(ebuf, sizeof(ebuf),
+                     "MCE: Fatal error happened on CPUs %*pb",
+                     nr_cpu_ids, cpumask_bits(&mce_fatal_cpus));
+
             mc_panic(ebuf);
         }
         atomic_set(&found_error, 0);

xen/arch/x86/crash.c

@@ -159,11 +159,8 @@ static void nmi_shootdown_cpus(void)
     if ( cpumask_empty(&waiting_to_crash) )
         printk("Shot down all CPUs\n");
     else
-    {
-        cpulist_scnprintf(keyhandler_scratch, sizeof keyhandler_scratch,
-                          &waiting_to_crash);
-        printk("Failed to shoot down CPUs {%s}\n", keyhandler_scratch);
-    }
+        printk("Failed to shoot down CPUs {%*pbl}\n",
+               nr_cpu_ids, cpumask_bits(&waiting_to_crash));
 
     /* Crash shutdown any IOMMU functionality as the crashdump kernel is not
      * happy when booting if interrupt/dma remapping is still enabled */

xen/arch/x86/irq.c

@@ -2302,11 +2302,8 @@ static void dump_irqs(unsigned char key)
 
         spin_lock_irqsave(&desc->lock, flags);
 
-        cpumask_scnprintf(keyhandler_scratch, sizeof(keyhandler_scratch),
-                          desc->affinity);
-        printk("   IRQ:%4d affinity:%s vec:%02x type=%-15s"
-               " status=%08x ",
-               irq, keyhandler_scratch, desc->arch.vector,
+        printk("   IRQ:%4d affinity:%*pb vec:%02x type=%-15s status=%08x ",
+               irq, nr_cpu_ids, cpumask_bits(desc->affinity), desc->arch.vector,
                desc->handler->typename, desc->status);
 
         if ( ssid )