[Xen-changelog] [xen stable-4.7] xen: credit1: fix mask to be used for tickling in Credit1

[patchbot@xxxxxxx]

commit 24a1b1813019867b48bfb821f5ac760d0eec5c1f
Author:     Dario Faggioli <dario.faggioli@xxxxxxxxxx>
AuthorDate: Wed Sep 28 16:50:54 2016 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Sep 28 16:50:54 2016 +0200

    xen: credit1: fix mask to be used for tickling in Credit1
    
    If there are idle pcpus inside the waking vcpu's
    soft-affinity mask, we should really tickle one
    of them (this is one of the purposes of the
    __runq_tickle() function itself!), not just
    any idle pcpu.
    
    The issue has been introduced in 02ea5031825d
    ("credit1: properly deal with pCPUs not in any cpupool"),
    where the usage of idle_mask is changed, without
    updating the bottom of the function, where it
    is also referenced.
    
    Signed-off-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
    Acked-by: George Dunlap <george.dunlap@xxxxxxxxxx>
    master commit: f83fc393b2bb0a8b97bca07d810684a2c709aaa8
    master date: 2016-09-15 12:39:47 +0100
---
 xen/common/sched_credit.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/xen/common/sched_credit.c b/xen/common/sched_credit.c
index 182f0cc..214544f 100644
--- a/xen/common/sched_credit.c
+++ b/xen/common/sched_credit.c
@@ -463,11 +463,12 @@ static inline void __runq_tickle(struct csched_vcpu *new)
                 if ( opt_tickle_one_idle )
                 {
                     this_cpu(last_tickle_cpu) =
-                        cpumask_cycle(this_cpu(last_tickle_cpu), &idle_mask);
+                        cpumask_cycle(this_cpu(last_tickle_cpu),
+                                      cpumask_scratch_cpu(cpu));
                     __cpumask_set_cpu(this_cpu(last_tickle_cpu), &mask);
                 }
                 else
-                    cpumask_or(&mask, &mask, &idle_mask);
+                    cpumask_or(&mask, &mask, cpumask_scratch_cpu(cpu));
             }
 
             /* Did we find anyone? */
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.7

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