swap: remove get/put_swap_device() in __swap_duplicate()
__swap_duplicate() is called by - swap_shmem_alloc(): the folio in swap cache is locked. - copy_nonpresent_pte() -> swap_duplicate() and try_to_unmap_one() -> swap_duplicate(): the page table lock is held. - __read_swap_cache_async() -> swapcache_prepare(): enclosed with get/put_swap_device() in __read_swap_cache_async() already. So, it's safe to remove get/put_swap_device() in __swap_duplicate(). Link: https://lkml.kernel.org/r/20230529061355.125791-5-ying.huang@intel.com Signed-off-by: "Huang, Ying" <ying.huang@intel.com> Reviewed-by: Yosry Ahmed <yosryahmed@google.com> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Chris Li (Google) <chrisl@kernel.org> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: Yang Shi <shy828301@gmail.com> Cc: Yu Zhao <yuzhao@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -3265,9 +3265,7 @@ static int __swap_duplicate(swp_entry_t entry, unsigned char usage)
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unsigned char has_cache;
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int err;
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p = get_swap_device(entry);
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if (!p)
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return -EINVAL;
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p = swp_swap_info(entry);
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offset = swp_offset(entry);
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ci = lock_cluster_or_swap_info(p, offset);
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@ -3314,7 +3312,6 @@ static int __swap_duplicate(swp_entry_t entry, unsigned char usage)
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unlock_out:
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unlock_cluster_or_swap_info(p, ci);
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put_swap_device(p);
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return err;
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}
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