Re: kernel 3.2.27 on arm: WARNING: at mm/page_alloc.c:2109 __alloc_pages_nodemask+0x1d4/0x68c()

On Thu, 2012-10-04 at 18:02 +0200, Maxime Bizon wrote:

O

Since skb_recycle() resets skb->data using (skb->head + NET_SKB_PAD), a
recycled skb going multiple times through a path that needs to expand
skb head will get bigger and bigger each time, and you eventually end up
with an allocation failure.

Because there is not enough headroom ?

An idea to fix this would be to pass needed skb size to skb_resize() and
set skb->data to MIN(NET_SKB_PAD, (skb->end - skb->head - skb_size) / 2)

I am trying to decode this but I cant ;)

What is skb_resize() ?
and what do you mean setting skb->data to MIN(NET_SKB_PAD, (skb->end -
skb->head - skb_size) / 2)

Care to explain again your idea ?

Thanks !