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[PATCH v2 3/7] xen: cpupool: add a back-pointer from a scheduler to its pool

If we need to know within which pool a particular scheduler
is working, we can do that by querying the cpupool pointer
of any of the sched_resource-s (i.e., ~ any of the CPUs)
assigned to the scheduler itself.

Basically, we pick any sched_resource that we know uses that
scheduler, and we check its *cpupool pointer. If we really
know that the resource uses the scheduler, this is fine, as
it also means the resource is inside the pool we are
looking for.

But, of course, we can do that for a pool/scheduler that has
not any been given any sched_resource yet (or if we do not
know whether or not it has any sched_resource).

To overcome such limitation, add a back pointer from the
scheduler, to its own pool.

Signed-off-by: Dario Faggioli <dfaggioli@xxxxxxxx>
Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: George Dunlap <george.dunlap@xxxxxxxxxx>
Changes from v1:
* new patch
 xen/common/sched/cpupool.c |    1 +
 xen/common/sched/private.h |    1 +
 2 files changed, 2 insertions(+)

diff --git a/xen/common/sched/cpupool.c b/xen/common/sched/cpupool.c
index 0664f7fa3d..7ea641ca26 100644
--- a/xen/common/sched/cpupool.c
+++ b/xen/common/sched/cpupool.c
@@ -287,6 +287,7 @@ static struct cpupool *cpupool_create(
         if ( c->sched == NULL )
             goto err;
+    c->sched->cpupool = c;
     c->gran = opt_sched_granularity;
     *q = c;
diff --git a/xen/common/sched/private.h b/xen/common/sched/private.h
index b9a5b4c01c..df50976eb2 100644
--- a/xen/common/sched/private.h
+++ b/xen/common/sched/private.h
@@ -275,6 +275,7 @@ struct scheduler {
     char *opt_name;         /* option name for this scheduler    */
     unsigned int sched_id;  /* ID for this scheduler             */
     void *sched_data;       /* global data pointer               */
+    struct cpupool *cpupool;/* points to this scheduler's pool   */
     int          (*global_init)    (void);



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