Konstantin Belousov wrote:
>Author: kib
>Date: Fri Feb 23 18:26:31 2018
>New Revision: 329875
>URL: https://svnweb.freebsd.org/changeset/base/329875
>
>Log:
>  Restore UP build.
>
>  Reviewed by:  truckman
>  Sponsored by: The FreeBSD Foundation
>
>Modified:
>  head/sys/kern/sched_ule.c
>
>Modified: head/sys/kern/sched_ule.c
>==============================================================================
>--- head/sys/kern/sched_ule.c   Fri Feb 23 18:18:42 2018        (r329874)
>+++ head/sys/kern/sched_ule.c   Fri Feb 23 18:26:31 2018        (r329875)
>@@ -1864,6 +1864,7 @@ sched_lend_user_prio(struct thread *td, u_char prio)
>                td->td_flags |= TDF_NEEDRESCHED;
> }
>
>+#ifdef SMP
> /*
>  * This tdq is about to idle.  Try to steal a thread from another CPU before
>  * choosing the idle thread.
>@@ -1945,6 +1946,7 @@ tdq_trysteal(struct tdq *tdq)
>        }
>        spinlock_exit();
 >}
>+#endif
>
> /*
>  * Handle migration from sched_switch().  This happens only for
>@@ -2058,8 +2060,10 @@ sched_switch(struct thread *td, struct thread *newtd,
>                TDQ_LOCK(tdq);
>                mtx = thread_lock_block(td);
>                tdq_load_rem(tdq, td);
>+#ifdef SMP
>                if (tdq->tdq_load == 0)
Since the function isn't called for UP, should this "if" also check for ncpus > 
1 by any chance?
(I know nothing about ULE, so please ignore this if it doesn't make sense;-)
>                        tdq_trysteal(tdq);
>+#endif
>        }
>
> #if (KTR_COMPILE & KTR_SCHED) != 0

rick
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