xen: Use kcalloc() in xen_init_IRQ()

The init_IRQ() function is now called with slab allocator initialized.
Therefore, we must not use the bootmem allocator in xen_init_IRQ().

Fixes the following boot-time warning:

  ------------[ cut here ]------------
  WARNING: at mm/bootmem.c:535 alloc_arch_preferred_bootmem+0x27/0x45()
  Modules linked in:
  Pid: 0, comm: swapper Not tainted 2.6.30 #1
  Call Trace:
   [<ffffffff8102d6e3>] ? warn_slowpath_common+0x73/0xb0
   [<ffffffff810210d9>] ? pvclock_clocksource_read+0x49/0x90
   [<ffffffff812e522f>] ? alloc_arch_preferred_bootmem+0x27/0x45
   [<ffffffff812e5761>] ? ___alloc_bootmem_nopanic+0x39/0xc9
   [<ffffffff812e57fa>] ? ___alloc_bootmem+0x9/0x2f
   [<ffffffff812e9e21>] ? xen_init_IRQ+0x25/0x61
   [<ffffffff812d69ee>] ? start_kernel+0x1b5/0x29e
  ---[ end trace 4eaa2a86a8e2da22 ]---

Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Tested-by: Christian Kujau <lists@nerdbynature.de>
Reported-by: Christian Kujau <lists@nerdbynature.de>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: lists@nerdbynature.de
Cc: jeremy.fitzhardinge@citrix.com
LKML-Reference: <1246438278.22417.28.camel@penberg-laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 891d2e9..abad71b 100644 (file)
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -927,9 +927,9 @@ static struct irq_chip xen_dynamic_chip __read_mostly = {
 void __init xen_init_IRQ(void)
 {
        int i;
-       size_t size = nr_cpu_ids * sizeof(struct cpu_evtchn_s);
 
-       cpu_evtchn_mask_p = alloc_bootmem(size);
+       cpu_evtchn_mask_p = kcalloc(nr_cpu_ids, sizeof(struct cpu_evtchn_s),
+                                   GFP_KERNEL);
        BUG_ON(cpu_evtchn_mask_p == NULL);
 
        init_evtchn_cpu_bindings();