[xen master] xen: credit2: factor runqueue initialization in its own function.

[patchbot@xxxxxxx]

commit c963db8d18e6583d688693ed2e9ca4f15a24c7d9
Author:     Dario Faggioli <dfaggioli@xxxxxxxx>
AuthorDate: Thu May 28 23:29:30 2020 +0200
Commit:     George Dunlap <george.dunlap@xxxxxxxxxx>
CommitDate: Fri May 29 18:53:53 2020 +0100

    xen: credit2: factor runqueue initialization in its own function.
    
    As it will be useful in later changes. While there, fix
    the doc-comment.
    
    No functional change intended.
    
    Signed-off-by: Dario Faggioli <dfaggioli@xxxxxxxx>
    Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
---
 xen/common/sched/credit2.c | 35 +++++++++++++++++++++++------------
 1 file changed, 23 insertions(+), 12 deletions(-)

diff --git a/xen/common/sched/credit2.c b/xen/common/sched/credit2.c
index 697c9f917d..8a4f28b9f5 100644
--- a/xen/common/sched/credit2.c
+++ b/xen/common/sched/credit2.c
@@ -3766,21 +3766,16 @@ csched2_alloc_pdata(const struct scheduler *ops, int 
cpu)
     return spc;
 }
 
-/* Returns the ID of the runqueue the cpu is assigned to. */
-static struct csched2_runqueue_data *
-init_pdata(struct csched2_private *prv, struct csched2_pcpu *spc,
-           unsigned int cpu)
+/*
+ * Do what's necessary to add cpu to the rqd (including activating the
+ * runqueue, if this is the first CPU we put in it).
+ */
+static void
+init_cpu_runqueue(struct csched2_private *prv, struct csched2_pcpu *spc,
+                  unsigned int cpu, struct csched2_runqueue_data *rqd)
 {
-    struct csched2_runqueue_data *rqd;
     unsigned int rcpu;
 
-    ASSERT(rw_is_write_locked(&prv->lock));
-    ASSERT(!cpumask_test_cpu(cpu, &prv->initialized));
-    /* CPU data needs to be allocated, but still uninitialized. */
-    ASSERT(spc);
-
-    rqd = spc->rqd;
-
     ASSERT(rqd && !cpumask_test_cpu(cpu, &spc->rqd->active));
 
     printk(XENLOG_INFO "Adding cpu %d to runqueue %d\n", cpu, rqd->id);
@@ -3816,6 +3811,22 @@ init_pdata(struct csched2_private *prv, struct 
csched2_pcpu *spc,
 
     if ( rqd->nr_cpus == 1 )
         rqd->pick_bias = cpu;
+}
+
+/* Returns a pointer to the runqueue the cpu is assigned to. */
+static struct csched2_runqueue_data *
+init_pdata(struct csched2_private *prv, struct csched2_pcpu *spc,
+           unsigned int cpu)
+{
+    struct csched2_runqueue_data *rqd;
+
+    ASSERT(rw_is_write_locked(&prv->lock));
+    ASSERT(!cpumask_test_cpu(cpu, &prv->initialized));
+    /* CPU data needs to be allocated, but still uninitialized. */
+    ASSERT(spc);
+
+    rqd = spc->rqd;
+    init_cpu_runqueue(prv, spc, cpu, rqd);
 
     return rqd;
 }
--
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