xen/time: Fix kasprintf splat when allocating timer%d IRQ line.

When we online the CPU, we get this splat:

smpboot: Booting Node 0 Processor 1 APIC 0x2
installing Xen timer for CPU 1
BUG: sleeping function called from invalid context at /home/konrad/ssd/konrad/linux/mm/slab.c:3179
in_atomic(): 1, irqs_disabled(): 0, pid: 0, name: swapper/1
Pid: 0, comm: swapper/1 Not tainted 3.9.0-rc6upstream-00001-g3884fad #1
Call Trace:
 [<ffffffff810c1fea>] __might_sleep+0xda/0x100
 [<ffffffff81194617>] __kmalloc_track_caller+0x1e7/0x2c0
 [<ffffffff81303758>] ? kasprintf+0x38/0x40
 [<ffffffff813036eb>] kvasprintf+0x5b/0x90
 [<ffffffff81303758>] kasprintf+0x38/0x40
 [<ffffffff81044510>] xen_setup_timer+0x30/0xb0
 [<ffffffff810445af>] xen_hvm_setup_cpu_clockevents+0x1f/0x30
 [<ffffffff81666d0a>] start_secondary+0x19c/0x1a8

The solution to that is use kasprintf in the CPU hotplug path
that 'online's the CPU. That is, do it in in xen_hvm_cpu_notify,
and remove the call to in xen_hvm_setup_cpu_clockevents.

Unfortunatly the later is not a good idea as the bootup path
does not use xen_hvm_cpu_notify so we would end up never allocating
timer%d interrupt lines when booting. As such add the check for
atomic() to continue.

CC: stable@vger.kernel.org
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

2 files changed, 9 insertions, 2 deletions

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 47d32434d0b6..ddbd54a9b845 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1641,8 +1641,11 @@ static int __cpuinit xen_hvm_cpu_notify(struct notifier_block *self,
         switch (action) {
         case CPU_UP_PREPARE:
                 xen_vcpu_setup(cpu);
-                if (xen_have_vector_callback)
+                if (xen_have_vector_callback) {
                         xen_init_lock_cpu(cpu);
+                        if (xen_feature(XENFEAT_hvm_safe_pvclock))
+                                xen_setup_timer(cpu);
+                }
                 break;
         default:
                 break;
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 0296a9522501..054cc01bb849 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -497,7 +497,11 @@ static void xen_hvm_setup_cpu_clockevents(void)
 {
         int cpu = smp_processor_id();
         xen_setup_runstate_info(cpu);
-        xen_setup_timer(cpu);
+        /*
+         * xen_setup_timer(cpu) - snprintf is bad in atomic context. Hence
+         * doing it xen_hvm_cpu_notify (which gets called by smp_init during
+         * early bootup and also during CPU hotplug events).
+         */
         xen_setup_cpu_clockevents();
 }