[PATCH 03/12] kho: add a struct for radix callbacks

[Mike Rapoport]

On Mon, May 11, 2026 at 06:35:54PM +0200, Pratyush Yadav wrote:
> On Mon, May 11 2026, Mike Rapoport wrote:
> 
> > On Wed, Apr 29, 2026 at 03:39:05PM +0200, Pratyush Yadav wrote:
> >> From: "Pratyush Yadav (Google)" <pratyush at kernel.org>
> >> 
> >> A future commit will add more callbacks for the KHO radix tree. Add a
> >> struct for collecting the callbacks.
> >> 
> >> Signed-off-by: Pratyush Yadav (Google) <pratyush at kernel.org>
> >> ---
> [...]
> >> --- a/kernel/liveupdate/kexec_handover.c
> >> +++ b/kernel/liveupdate/kexec_handover.c
> >> @@ -266,16 +266,18 @@ void kho_radix_del_key(struct kho_radix_tree *tree, unsigned long key)
> >>  }
> >>  EXPORT_SYMBOL_GPL(kho_radix_del_key);
> >>  
> >> -static int kho_radix_walk_leaf(struct kho_radix_leaf *leaf,
> >> -			       unsigned long key,
> >> -			       kho_radix_tree_walk_callback_t cb)
> >> +static int kho_radix_walk_leaf(struct kho_radix_leaf *leaf, unsigned long key,
> >> +			       const struct kho_radix_walk_cb *cb)
> >>  {
> >>  	unsigned long *bitmap = (unsigned long *)leaf;
> >>  	unsigned int i;
> >>  	int err;
> >>  
> >> +	if (!cb->key)
> >> +		return 0;
> >> +
> >>  	for_each_set_bit(i, bitmap, PAGE_SIZE * BITS_PER_BYTE) {
> >> -		err = cb(key | i);
> >> +		err = cb->key(key | i);
> >
> > key(key) reads weird :)
> > Can't say I have a good name, maybe key_action()?
> 
> I thought the context of it being under a callback struct would make it
> more obvious. I don't like key_action() much better TBH, but I don't
> have a strong opinion. Perhaps Pasha can suggest a 3rd option and we
> pick on randomly ;-)

Another option I thought is to call them ->leaf() and ->node().
 
> >
> >>  		if (err)
> >>  			return err;
> >>  	}
> 
> -- 
> Regards,
> Pratyush Yadav

-- 
Sincerely yours,
Mike.