[Xen-changelog] [xen staging] xen/sched: only allow schedulers with all mandatory functions available

[patchbot@xxxxxxx]

commit ec25b3c0261c5d2cd59b645004178313ac3fe974
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Tue May 28 12:32:14 2019 +0200
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Tue Jun 11 17:42:52 2019 +0100

    xen/sched: only allow schedulers with all mandatory functions available
    
    Some functions of struct scheduler are mandatory. Test those in the
    scheduler initialization loop to be present and drop schedulers not
    complying.
    
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Reviewed-by: Dario Faggioli <dfaggioli@xxxxxxxx>
---
 xen/common/schedule.c | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/xen/common/schedule.c b/xen/common/schedule.c
index 86341bc8fb..b671aeadb7 100644
--- a/xen/common/schedule.c
+++ b/xen/common/schedule.c
@@ -1727,9 +1727,33 @@ void __init scheduler_init(void)
 
     for ( i = 0; i < NUM_SCHEDULERS; i++)
     {
+#define sched_test_func(f)                               \
+        if ( !schedulers[i]->f )                         \
+        {                                                \
+            printk("scheduler %s misses .%s, dropped\n", \
+                   schedulers[i]->opt_name, #f);         \
+            schedulers[i] = NULL;                        \
+        }
+
+        sched_test_func(init);
+        sched_test_func(deinit);
+        sched_test_func(pick_cpu);
+        sched_test_func(alloc_vdata);
+        sched_test_func(free_vdata);
+        sched_test_func(switch_sched);
+        sched_test_func(do_schedule);
+
+#undef sched_test_func
+
         if ( schedulers[i]->global_init && schedulers[i]->global_init() < 0 )
+        {
+            printk("scheduler %s failed initialization, dropped\n",
+                   schedulers[i]->opt_name);
             schedulers[i] = NULL;
-        else if ( !ops.name && !strcmp(schedulers[i]->opt_name, opt_sched) )
+        }
+
+        if ( schedulers[i] && !ops.name &&
+             !strcmp(schedulers[i]->opt_name, opt_sched) )
             ops = *schedulers[i];
     }
 
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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