[PATCH RFC POC 19/50] file: require the syscall exit hook from every architecture

[sashiko-bot at kernel.org]

> Every architecture now either uses the generic entry code or provides
> TIF_FD_SLOTS. The fallback that deferred without ever committing
> can go. Make it a build error instead. A new architecture can't grow
> fd_prepare() callers without the syscall exit hook.
> 
> Signed-off-by: Christian Brauner (Amutable) <brauner at kernel.org>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260915-work-fd-reserve-unify-folded-v1-0-4d5217d6b246@kernel.org?part=19