On 2021-11-16 18:59:55 [-0800], Davidlohr Bueso wrote: > fcoe_get_paged_crc_eof() relies on the caller having preemption > disabled to ensure the per-CPU fcoe_percpu context remains valid > throughout the call. This is done by either holding spinlocks > (such as bnx2fc_global_lock or qedf_global_lock) or the get_cpu() > from fcoe_alloc_paged_crc_eof(). This last one breaks PREEMPT_RT > semantics as there can be memory allocation and end up sleeping > in atomic contexts. > > Introduce a local_lock_t to struct fcoe_percpu that will keep the > non-RT case the same, mapping to preempt_disable/enable, while > RT will use a per-CPU spinlock allowing the region to be preemptible > but still maintain CPU locality. The other users of fcoe_percpu > are already safe in this regard and do not require local_lock()ing. > > Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx> Acked-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> Sebastian
