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authorToke Høiland-Jørgensen <toke@redhat.com>2021-06-24 18:05:54 +0200
committerDaniel Borkmann <daniel@iogearbox.net>2021-06-24 19:41:15 +0200
commit694cea395fded425008e93cd90cfdf7a451674af (patch)
treebe068946c3b7fd801c7d8854947c4d090de9896b /include/linux/filter.h
parente74c74f9e51deb725e72d129084ba8252d47222d (diff)
bpf: Allow RCU-protected lookups to happen from bh context
XDP programs are called from a NAPI poll context, which means the RCU reference liveness is ensured by local_bh_disable(). Add rcu_read_lock_bh_held() as a condition to the RCU checks for map lookups so lockdep understands that the dereferences are safe from inside *either* an rcu_read_lock() section *or* a local_bh_disable() section. While both bh_disabled and rcu_read_lock() provide RCU protection, they are semantically distinct, so we need both conditions to prevent lockdep complaints. This change is done in preparation for removing the redundant rcu_read_lock()s from drivers. Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Martin KaFai Lau <kafai@fb.com> Link: https://lore.kernel.org/bpf/20210624160609.292325-5-toke@redhat.com
Diffstat (limited to 'include/linux/filter.h')
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