Arches that don't support PREEMPT

[Peter Zijlstra]

On Tue, Sep 19, 2023 at 03:37:24PM +0200, John Paul Adrian Glaubitz wrote:
> On Tue, 2023-09-19 at 14:00 +0100, Matthew Wilcox wrote:
> > On Tue, Sep 19, 2023 at 02:30:59PM +0200, Thomas Gleixner wrote:
> > > Though it just occured to me that there are dragons lurking:
> > > 
> > > arch/alpha/Kconfig:     select ARCH_NO_PREEMPT
> > > arch/hexagon/Kconfig:   select ARCH_NO_PREEMPT
> > > arch/m68k/Kconfig:      select ARCH_NO_PREEMPT if !COLDFIRE
> > > arch/um/Kconfig:        select ARCH_NO_PREEMPT
> > 
> > Sounds like three-and-a-half architectures which could be queued up for
> > removal right behind ia64 ...
> 
> The agreement to kill off ia64 wasn't an invitation to kill off other stuff
> that people are still working on! Can we please not do this?

If you're working on one of them, then surely it's a simple matter of
working on adding CONFIG_PREEMPT support :-)