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    SubjectRe: [PATCH 1/6] Generic radix trees
    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)

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