net: Use nested-BH locking for napi_alloc_cache.

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napi_alloc_cache 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.

Add a local_lock_t to the data structure 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>
Link: https://patch.msgid.link/20240620132727.660738-5-bigeasy@linutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Sebastian Andrzej Siewior 2024-06-20 15:21:54 +02:00 • committed by Jakub Kicinski

parent 43d7ca2907

commit bdacf3e349

1 changed files with 24 additions and 5 deletions

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net/core/skbuff.c

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