On Fri, Jan 22, 2021 at 05:53:43PM +0100, Peter Zijlstra wrote: > On Mon, Jan 18, 2021 at 03:12:19PM +0100, Frederic Weisbecker wrote: > > +config HAVE_PREEMPT_DYNAMIC > > + bool > > + depends on HAVE_STATIC_CALL_INLINE > > I think we can relax this to HAVE_STATIC_CALL, using trampolines > shouldn't be too bad, and that would put it in reach of arm64.
Why not, but then I need to make CONFIG_PREEMPT_DYNAMIC optional in order not to make the overhead mandatory for everyone. > > > + depends on GENERIC_ENTRY > > + help > > + Select this if the architecture support boot time preempt setting > > + on top of static calls. It is strongly advised to support inline > > + static call to avoid any overhead.
