Re: [PATCH bpf-next] bpf/bpf_lru_list: make bpf_common_lru_pop_free safe in NMI

[Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>]

On Wed, Aug 21, 2024 at 2:30 PM Priya Bala Govindasamy <pgovind2@xxxxxxx> wrote:
>
> bpf_common_lru_pop_free uses raw_spin_lock_irqsave. This function is
> used by htab_lru_map_update_elem() which can be called from an
> NMI. A deadlock can happen if a bpf program holding the lock is
> interrupted by the same program in NMI. Use raw_spin_trylock_irqsave if
> in NMI.
>
> Fixes: 3a08c2fd7634 (bpf: LRU list)
> Signed-off-by: Priya Bala Govindasamy <pgovind2@xxxxxxx>
> Signed-off-by: Amery Hung <ameryhung@xxxxxxxxx>

Nothing changed since last time exact same patch was posted,
so same nack as before.
pw-bot: cr