diff options
| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2024-06-20 15:22:00 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-06-24 16:41:23 -0700 |
| commit | b22800f9d3b142bf2550dd47ff738b9feedc1093 (patch) | |
| tree | db9356395ad16645c87889b4bb2cd6a4509e3a88 /mm/maccess.c | |
| parent | a8760d0d1497878d01f901ef2038c7389187a8af (diff) | |
dev: Use nested-BH locking for softnet_data.process_queue.
softnet_data::process_queue is a per-CPU variable and relies on disabled
BH for its locking. Without per-CPU locking in local_bh_disable() on
PREEMPT_RT this data structure requires explicit locking.
softnet_data::input_queue_head can be updated lockless. This is fine
because this value is only update CPU local by the local backlog_napi
thread.
Add a local_lock_t to softnet_data and use local_lock_nested_bh() for locking
of process_queue. This change adds only lockdep coverage and does not
alter the functional behaviour for !PREEMPT_RT.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://patch.msgid.link/20240620132727.660738-11-bigeasy@linutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'mm/maccess.c')
0 files changed, 0 insertions, 0 deletions