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b8844aab51
In struct channel, the upl lock is implemented using rwlock_t, protecting access to pch->ppp and pch->bridge. As previously discussed on the list, using rwlock in the network fast path is not recommended. This patch replaces the rwlock with a spinlock for writers, and uses RCU for readers. - pch->ppp and pch->bridge are now declared as __rcu pointers. - Readers use rcu_dereference_bh() under rcu_read_lock_bh(). - Writers use spin_lock() to update. Signed-off-by: Qingfang Deng <dqfext@gmail.com> Link: https://patch.msgid.link/20250822012548.6232-1-dqfext@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>