netfilter: nft_inner: Use nested-BH locking for nft_pcpu_tun_ctx

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nft_pcpu_tun_ctx 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.

Make a struct with a nft_inner_tun_ctx member (original
nft_pcpu_tun_ctx) and a local_lock_t and use local_lock_nested_bh() for
locking. 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>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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Sebastian Andrzej Siewior 2025-05-12 12:28:45 +02:00 • committed by Pablo Neira Ayuso

parent a1f1acb9c5

commit ba36fada9a

1 changed files with 15 additions and 3 deletions

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net/netfilter/nft_inner.c

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