Re: [PATCH 4/5] rust: sync: atomic: Add Atomic<*mut T> support

[Boqun Feng <boqun.feng@gmail.com>]

On Sun, Jan 18, 2026 at 09:38:36AM +0100, Dirk Behme wrote:
[...]
> >  
> > +// The current helpers of load/store uses `{WRITE,READ}_ONCE()` hence the atomicity is only
> 
> uses -> use ?
> 

Will fix, thank you!

> > +// guaranteed against read-modify-write operations if the architecture supports native atomic RmW.
> > +#[cfg(CONFIG_ARCH_SUPPORTS_ATOMIC_RMW)]
> > +impl AtomicImpl for *const c_void {
> > +    type Delta = isize;
> > +}
> 
> Are all users of this guarded with CONFIG_ARCH_SUPPORTS_ATOMIC_RMW as
> well? Or do we want (need?) to cover the

No, the users don't need to guard with CONFIG_ARCH_SUPPORTS_ATOMIC_RMW,
the purpose of this #[cfg] is to avoid surprise that when
CONFIG_ARCH_SUPPORTS_ATOMIC_RMW=n arch supports Rust, when that happens,
we need to add the support to the helpers of i8/i16/ptr.

> non-CONFIG_ARCH_SUPPORTS_ATOMIC_RMW cases where someone tries to use

Note that these arches are very rare, so we might not have any problem
for a while.

Regards,
Boqun

> this as well?
> 
> Best regards
> 
> Dirk
> 
> 
>