bpf: allow using bpf_kptr_xchg even if the NON_OWN_REF flag is set

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When traversing an rbtree using bpf_rbtree_left/right, if bpf_kptr_xchg
is used to access the __kptr pointer contained in a node, it currently
requires first removing the node with bpf_rbtree_remove and clearing the
NON_OWN_REF flag, then re-adding the node to the original rbtree with
bpf_rbtree_add after usage. This process significantly degrades rbtree
traversal performance. The patch enables accessing __kptr pointers with
the NON_OWN_REF flag set while holding the lock, eliminating the need
for this remove-read-add sequence.

Signed-off-by: Kaitao Cheng <chengkaitao@kylinos.cn>
Signed-off-by: Feng Yang <yangfeng@kylinos.cn>
Link: https://lore.kernel.org/r/20260214124042.62229-3-pilgrimtao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Kaitao Cheng 2026-02-14 20:40:39 +08:00 • committed by Alexei Starovoitov

parent 964c074768

commit ee9886c40a

1 changed files with 3 additions and 1 deletions

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kernel/bpf/verifier.c

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