Re: [RFC v2 PATCH 0/16] Optimize this_cpu_*() ops for non-x86 (ARM64 for this series)

On Tue, 4 Aug 2026, Lorenzo Stoakes (ARM) wrote:

> Since this work seems to be very much arm64-focused, perhaps it's therefore
> worth looking at an alterative solution that's specific to the arch, like the
> one suggested by Mark ([1])?
>
> [0]:https://lore.kernel.org/all/CAHk-=wire3dzhHx=KiL_f5Rj0=1u9ustsa33QoR-F9-v-NU9Ng@mail.gmail.com/
> [1]:https://lore.kernel.org/linux-arm-kernel/al_DpFJFcmVhxpvW@J2N7QTR9R3/

Mark's solution does replace the preempt_enable/disable sections with a
rather hacky restart logic. It relies on a long preemable and postscript
to each per cpu operations.

 It does not remove the code entirely like the proposed patchset here and
cannot produce the same compact code as x86.