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270f095179
The allocator uses SWAP_HAS_CACHE to pin a swap slot upon allocation. SWAP_HAS_CACHE is being deprecated as it caused a lot of confusion. This pinning usage here can be dropped by adding the folio to swap cache directly on allocation. All swap allocations are folio-based now (except for hibernation), so the swap allocator can always take the folio as the parameter. And now both swap cache (swap table) and swap map are protected by the cluster lock, scanning the map and inserting the folio can be done in the same critical section. This eliminates the time window that a slot is pinned by SWAP_HAS_CACHE, but it has no cache, and avoids touching the lock multiple times. This is both a cleanup and an optimization. Link: https://lkml.kernel.org/r/20251220-swap-table-p2-v5-15-8862a265a033@tencent.com Signed-off-by: Kairui Song <kasong@tencent.com> Reviewed-by: Baoquan He <bhe@redhat.com> Cc: Baolin Wang <baolin.wang@linux.alibaba.com> Cc: Barry Song <baohua@kernel.org> Cc: Chris Li <chrisl@kernel.org> Cc: Nhat Pham <nphamcs@gmail.com> Cc: Rafael J. Wysocki (Intel) <rafael@kernel.org> Cc: Yosry Ahmed <yosry.ahmed@linux.dev> Cc: Deepanshu Kartikey <kartikey406@gmail.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Kairui Song <ryncsn@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>