bpf: Refactor active lock management #8009
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When bpf_spin_lock was introduced originally, there was deliberation on whether to use an array of lock IDs, but since bpf_spin_lock is limited to holding a single lock at any given time, we've been using a single ID to identify the held lock. In preparation for introducing spin locks that can be taken multiple times, introduce support for acquiring multiple lock IDs. For this purpose, reuse the acquired_refs array and store both lock and pointer references. We tag the entry with REF_TYPE_PTR or REF_TYPE_BPF_LOCK to disambiguate and find the relevant entry. The ptr field is used to track the map_ptr or btf (for bpf_obj_new allocations) to ensure locks can be matched with protected fields within the same "allocation", i.e. bpf_obj_new object or map value. The struct active_lock is changed to a boolean as the state is part of the acquired_refs array, and we only need active_lock as a cheap way of detecting lock presence. Signed-off-by: Kumar Kartikeya Dwivedi <[email protected]>
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Pull request for series with
subject: bpf: Refactor active lock management
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=905807