[xen stable-4.20] arinc653: remove idle period in default schedule

[patchbot@xxxxxxx]

commit 36366ff7d31dcbc1a935e217a478ccd986f7fc66
Author:     Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
AuthorDate: Mon Apr 20 12:33:36 2026 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Apr 20 12:33:36 2026 +0200

    arinc653: remove idle period in default schedule
    
    By initializing major_frame in a653sched_init(), an idle period was
    inadvertently introduced into the default schedule. Account for the
    initial value of major_frame when populating the default schedule.
    
    Fixes: f2927d8343ae ("xen/arinc653: fix delay in the start of major frame")
    Signed-off-by: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
    Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
    master commit: 6d412c059982d821260055eaa43417b3245b2050
    master date: 2026-03-26 10:49:11 +0100
---
 xen/common/sched/arinc653.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/common/sched/arinc653.c b/xen/common/sched/arinc653.c
index 0cc565f2c8..1b0ed2f9dd 100644
--- a/xen/common/sched/arinc653.c
+++ b/xen/common/sched/arinc653.c
@@ -425,7 +425,8 @@ a653sched_alloc_udata(const struct scheduler *ops, struct 
sched_unit *unit,
             sched_priv->schedule[entry].runtime = DEFAULT_TIMESLICE;
             sched_priv->schedule[entry].unit = unit;
 
-            sched_priv->major_frame += DEFAULT_TIMESLICE;
+            if ( entry )
+                sched_priv->major_frame += DEFAULT_TIMESLICE;
             ++sched_priv->num_schedule_entries;
         }
     }
--
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