On Wed, 10 Apr 2019 16:34:29 -0700
Song Liu <[email protected]> wrote:
> > +struct sk_buff *build_skb_around(struct sk_buff *skb,
> > + void *data, unsigned int frag_size)
> > +{
> > + if (unlikely(!skb))
> > + return NULL;
> > +
> > + skb = __build_skb_around(skb, data, frag_size);
>
>
> > +
> > + if (skb && frag_size) {
> > + skb->head_frag = 1;
> > + if (page_is_pfmemalloc(virt_to_head_page(data)))
> > + skb->pfmemalloc = 1;
> > + }
>
> I didn't find any explanation of this part (head_frag, pfmemalloc).
> Shall we split it out to a separate patch?
No, it belongs here. This is like/based on the __build_skb() and
build_skb() split, and needed such that __build_skb() can reuse the
code in __build_skb_around().
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer
