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0fcf8ef4fd
swp_swap_info is the most commonly used helper for retrieving swap info. It has an internal check that may lead to a NULL return value, but almost none of its caller checks the return value, making the internal check pointless. In fact, most of these callers already ensured the entry is valid and never expect a NULL value. Tidy this up and improve the function names. If the caller can make sure the swap entry/type is valid and the device is pinned, use the new introduced __swap_entry_to_info/__swap_type_to_info instead. They have more debug sanity checks and lower overhead as they are inlined. Callers that may expect a NULL value should use swap_entry_to_info/swap_type_to_info instead. No feature change. The rearranged codes should have had no effect, or they should have been hitting NULL de-ref bugs already. Only some new sanity checks are added so potential issues may show up in debug build. The new helpers will be frequently used with swap table later when working with swap cache folios. A locked swap cache folio ensures the entries are valid and stable so these helpers are very helpful. Link: https://lkml.kernel.org/r/20250916160100.31545-8-ryncsn@gmail.com Signed-off-by: Kairui Song <kasong@tencent.com> Acked-by: Chris Li <chrisl@kernel.org> Reviewed-by: Barry Song <baohua@kernel.org> Acked-by: David Hildenbrand <david@redhat.com> Suggested-by: Chris Li <chrisl@kernel.org> Cc: Baolin Wang <baolin.wang@linux.alibaba.com> Cc: Baoquan He <bhe@redhat.com> Cc: "Huang, Ying" <ying.huang@linux.alibaba.com> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Kemeng Shi <shikemeng@huaweicloud.com> Cc: kernel test robot <oliver.sang@intel.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Nhat Pham <nphamcs@gmail.com> Cc: Yosry Ahmed <yosryahmed@google.com> Cc: Zi Yan <ziy@nvidia.com> Cc: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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