selftests/bpf: Add supplementary tests for bpf_kptr_xchg

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1. Allow using bpf_kptr_xchg while holding a lock.
2. When the rb_node contains a __kptr pointer, we do not need to
   perform a remove-read-add operation.

This patch implements the following workflow:
1. Construct a rbtree with 16 elements.
2. Traverse the rbtree, locate the kptr pointer in the target node,
   and read the content pointed to by the pointer.
3. Remove all nodes from the rbtree.

Signed-off-by: Kaitao Cheng <chengkaitao@kylinos.cn>
Signed-off-by: Feng Yang <yangfeng@kylinos.cn>
Link: https://lore.kernel.org/r/20260214124042.62229-4-pilgrimtao@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

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

parent ee9886c40a

commit 580fa3430b

3 changed files with 177 additions and 0 deletions

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6

tools/testing/selftests/bpf/prog_tests/rbtree.c

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4

tools/testing/selftests/bpf/progs/bpf_misc.h

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167

tools/testing/selftests/bpf/progs/rbtree_search_kptr.c

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