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Previously, we used LW_EXCLUSIVE in several places despite only reading WalSummarizerCtl fields. This patch reduces the lock level to LW_SHARED where we are only reading the shared fields. Backpatch to 17, where wal summarization was introduced. Reviewed-by: Nathan Bossart <nathandbossart@gmail.com> Discussion: https://postgr.es/m/CAD21AoDdKhf_9oriEYxY-JCdF+Oe_muhca3pcdkMEdBMzyHyKw@mail.gmail.com Backpatch-through: 17