Re: [PATCH net] psp: use unrcu_pointer() for the cmpxchg() on netdev psp_dev

[Wei Wang]

On Thu, Aug 13, 2026 at 12:57 PM Daniel Zahka <daniel.zahka@xxxxxxxxx> wrote:
>
> >
>
>
> On 8/13/26 3:34 PM, Wei Wang wrote:
> > From: Wei Wang <weibunny@xxxxxx>
> >
> > sparse reports:
> >
> >    net/psp/psp_nl.c:513:13: sparse: sparse: cast removes address space
> >    '__rcu' of expression
> >
> > cmpxchg() returns typeof(*ptr) and its internal casts strip the __rcu
> > annotation. Wrap it in unrcu_pointer(), the documented way to use an
> > __rcu pointer with xchg() and friends.
> >
> > This was introduced by commit 06c2dce2d0f6 ("psp: add new netlink cmd
> > for dev-assoc and dev-disassoc").
> >
> > No functional change intended.
> >
> > Reported-by: kernel test robot <lkp@xxxxxxxxx>
> > Closes: https://lore.kernel.org/oe-kbuild-all/202608080910.l9KvOH7O-lkp@xxxxxxxxx/
> > Signed-off-by: Wei Wang <weibunny@xxxxxx>
> Commits targeting the net tree need a fixes tag.

This is a sparse warning fix, my understanding is that it's not a
functional fix and therefore should not use a Fixes tag. Please let me
know if my understanding is wrong.