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

[Pratyush Yadav]

On Tue, May 12 2026, Mike Rapoport wrote:

> 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().

This one sounds nice. Will use it in v2.

-- 
Regards,
Pratyush Yadav