Re: [Xen-devel] Regression introduced with 14e568e78f6f80ca1e27256641ddf524c7dbdc51 (stop_machine: Use smpboot threads)

[Thomas Gleixner <tglx@xxxxxxxxxxxxx>]

On Tue, 26 Feb 2013, Sander Eikelenboom wrote:
> Tuesday, February 26, 2013, 1:36:36 PM, you wrote:
> > On Fri, 22 Feb 2013, Konrad Rzeszutek Wilk wrote:
> >> 
> >> I don't know if this is b/c the Xen code is missing something or
> >> expects something that never happend. I hadn't looked at your
> >> patch in any detail (was going to do that on Monday).
> >> 
> >> Either way, if I boot a HVM guest with PV extensions (aka PVHVM)
> 
> Hmm i'm seeing this booting on baremetal as well.
> (see http://lkml.indiana.edu/hypermail/linux/kernel/1302.3/00836.html)

Ok. I decoded it with the help of Konrad. Does the patch below work
for you as well?

Thanks,

        tglx

Index: linux-2.6/include/linux/smpboot.h
===================================================================
--- linux-2.6.orig/include/linux/smpboot.h
+++ linux-2.6/include/linux/smpboot.h
@@ -24,6 +24,9 @@ struct smpboot_thread_data;
  *                     parked (cpu offline)
  * @unpark:            Optional unpark function, called when the thread is
  *                     unparked (cpu online)
+ * @pre_unpark:                Optional unpark function, called before the 
thread is
+ *                     unparked (cpu online). This is not guaranteed to be
+ *                     called on the target cpu of the thread. Careful!
  * @selfparking:       Thread is not parked by the park function.
  * @thread_comm:       The base name of the thread
  */
@@ -37,6 +40,7 @@ struct smp_hotplug_thread {
        void                            (*cleanup)(unsigned int cpu, bool 
online);
        void                            (*park)(unsigned int cpu);
        void                            (*unpark)(unsigned int cpu);
+       void                            (*pre_unpark)(unsigned int cpu);
        bool                            selfparking;
        const char                      *thread_comm;
 };
Index: linux-2.6/kernel/smpboot.c
===================================================================
--- linux-2.6.orig/kernel/smpboot.c
+++ linux-2.6/kernel/smpboot.c
@@ -209,6 +209,8 @@ static void smpboot_unpark_thread(struct
 {
        struct task_struct *tsk = *per_cpu_ptr(ht->store, cpu);
 
+       if (ht->pre_unpark)
+               ht->pre_unpark(cpu);
        kthread_unpark(tsk);
 }
 
Index: linux-2.6/kernel/stop_machine.c
===================================================================
--- linux-2.6.orig/kernel/stop_machine.c
+++ linux-2.6/kernel/stop_machine.c
@@ -336,7 +336,7 @@ static struct smp_hotplug_thread cpu_sto
        .create                 = cpu_stop_create,
        .setup                  = cpu_stop_unpark,
        .park                   = cpu_stop_park,
-       .unpark                 = cpu_stop_unpark,
+       .pre_unpark             = cpu_stop_unpark,
        .selfparking            = true,
 };
 

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