Re: [PATCH net v1] net: skb: fix cross-cache free of KFENCE-allocated skb head

[Jiayuan Chen]

On 4/2/26 4:03 PM, Eric Dumazet wrote:
> On Wed, Apr 1, 2026 at 9:15 PM Jiayuan Chen <jiayuan.chen@xxxxxxxxx> wrote:
> > If we no longer care about the cost of accessing a struct page in the
> > free path, which the original commit was trying to avoid, this is
> > indeed the simplest fix — kfree() correctly handles objects via
> > virt_to_slab.
> We only have SLUB in modern kernels, kmem_cache_free() needs to touch it.
>
> Using is_kfence_address() in net/core/skbuff.c is pushing too hard in
> my opinion.
Thanks, I understand.