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Switch rb->rings to be an array of pointers instead of a contiguous block. This allows for each ring pointer to be stable after ring_buffer__add is called, which allows us to expose struct ring * to the user without gotchas. Without this change, the realloc in ring_buffer__add could invalidate a struct ring *, making it unsafe to give to the user. Signed-off-by: Martin Kelly <martin.kelly@crowdstrike.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20230925215045.2375758-3-martin.kelly@crowdstrike.com