[Bug 197921] [patch] [sched] Allow non-migratable threads to bind to their current CPU.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197921

            Bug ID: 197921
           Summary: [patch] [sched] Allow non-migratable threads to bind
                    to their current CPU.
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: harrison.grundy at astrodoggroup.com

Created attachment 153316
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=153316&action=edit
Allow threads to bind to the local CPU even if marked unmigratable.

ULE currently prohibits sched_bind()'ing to the current CPU if a thread as
marked as un-migratable. This should only apply to threads attempting to bind
to other CPUs (as no migration is necessary to bind them to the existing local
CPU.)

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