[ovs-dev] [PATCH 1/6] Generic radix trees

[Liu Bo]

On Sat, May 26, 2018 at 1:56 PM, Kent Overstreet
<kent.overstreet at gmail.com> wrote:
> On Sat, May 26, 2018 at 11:16:42AM +0800, Liu Bo wrote:
>> > +/*
>> > + * Returns pointer to the specified byte @offset within @radix, allocating it if
>> > + * necessary - newly allocated slots are always zeroed out:
>> > + */
>> > +void *__genradix_ptr_alloc(struct __genradix *radix, size_t offset,
>> > +                          gfp_t gfp_mask)
>> > +{
>> > +       struct genradix_node **n;
>>
>> Any reason that " struct genradix_node ** " is used here instead of "
>> struct genradix_node * "?
>>
>> Looks like this function only manipulates *n, am I missing something?
>
> It stores to *n, when it has to allocate a node (including the root)

I see, thanks for the explanation.

thanks,
liubo