drop_monitor: Document scope of spinlock
authorIdo Schimmel <idosch@mellanox.com>
Tue, 6 Aug 2019 13:19:53 +0000 (16:19 +0300)
committerDavid S. Miller <davem@davemloft.net>
Tue, 6 Aug 2019 19:37:56 +0000 (12:37 -0700)
commit01921d53f870653f04ebf8d3c375029ee3ca4a31
treed1513f72b5008b7de07d94ed3ee1be9e44ebdfaa
parentdbf896b70d4a4bdbd10aec060af42d7c70e6a88d
drop_monitor: Document scope of spinlock

While 'per_cpu_dm_data' is a per-CPU variable, its 'skb' and
'send_timer' fields can be accessed concurrently by the CPU sending the
netlink notification to user space from the workqueue and the CPU
tracing kfree_skb(). This spinlock is meant to protect against that.

Document its scope and suppress the checkpatch message "spinlock_t
definition without comment".

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/core/drop_monitor.c