On Tue, 14 Sept 2021 at 15:55, Mark Rutland [off-list ref] wrote:

On Tue, Sep 14, 2021 at 02:10:28PM +0200, Ard Biesheuvel wrote:

quoted

Commit c65eacbe290b ("sched/core: Allow putting thread_info into
task_struct") mentions that, along with moving thread_info into
task_struct, the cpu field is moved out of the former into the latter,
but does not explain why.

From what I recall of talking to Andy around that time, when converting
arm64 over, the theory was that over time we'd move more and more out of
thread_info and into task_struct or thread_struct, until task_struct
supplanted thread_info entirely, and that all became generic.

I think the key gain there was making things more *generic*, and there
are other ways we could do that in future without moving more into
task_struct (e.g. with a geenric thread_info and arch_thread_info inside
that).

With that in mind, and given the diffstat, I think this is worthwhile.

FWIW, for the series:

Acked-by: Mark Rutland <mark.rutland@arm.com>

Thanks.

Any comments on this from the various arch maintainers? Especially
power, as Christophe seems happy with this but there are 3 different
patches affecting power that need a maintainer ack.