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Hou Tao says: ==================== bpf: Support atomic update for htab of maps From: Hou Tao <houtao1@huawei.com> Hi, The motivation for the patch set comes from the question raised by Cody Haas [1]. When trying to concurrently lookup and update an existing element in a htab of maps, the lookup procedure may return -ENOENT unexpectedly. The first revision of the patch set tried to resolve the problem by making the insertion of the new element and the deletion of the old element being atomic from the perspective of the lookup process. While the solution would benefit all hash maps, it does not fully resolved the problem due to the immediate reuse issue. Therefore, in v2 of the patch set, it only fixes the problem for fd htab. Please see individual patches for details. Comments are always welcome. v3: * rebase on bpf_next/for-next * add Acked-by tags v2: https://lore.kernel.org/bpf/20250308135110.953269-1-houtao@huaweicloud.com/ * only support atomic update for fd htab v1: https://lore.kernel.org/bpf/20250204082848.13471-1-hotforest@gmail.com [1]: https://lore.kernel.org/xdp-newbies/CAH7f-ULFTwKdoH_t2SFc5rWCVYLEg-14d1fBYWH2eekudsnTRg@mail.gmail.com/ ==================== Link: https://patch.msgid.link/20250401062250.543403-1-houtao@huaweicloud.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Linux kernel
============
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In order to build the documentation, use ``make htmldocs`` or
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There are various text files in the Documentation/ subdirectory,
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Please read the Documentation/process/changes.rst file, as it contains the
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