mm: swap: enable swap_entry_range_free() to drop any kind of last ref

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The original VM_BUG_ON only allows swap_entry_range_free() to drop last
SWAP_HAS_CACHE ref.  By allowing other kind of last ref in VM_BUG_ON,
swap_entry_range_free() could be a more general-purpose function able to
handle all kind of last ref.  Following thi change, also rename
swap_entry_range_free() to swap_entries_free() and update it's comment
accordingly.

This is a preparation to use swap_entries_free() to drop more kind of last
ref other than SWAP_HAS_CACHE.

[shikemeng@huaweicloud.com: add __maybe_unused attribute for swap_is_last_ref() and update comment]
  Link: https://lkml.kernel.org/r/20250410153908.612984-1-shikemeng@huaweicloud.com
Link: https://lkml.kernel.org/r/20250325162528.68385-3-shikemeng@huaweicloud.com
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Tim Chen <tim.c.chen@linux.intel.com>
Reviewed-by: Baoquan He <bhe@redhat.com>
Tested-by: SeongJae Park <sj@kernel.org>
Cc: Kairui Song <kasong@tencent.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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Kemeng Shi 2025-03-26 00:25:22 +08:00 • committed by Andrew Morton

parent 9c1c38bcdc

commit 64944ef6a1

1 changed files with 24 additions and 14 deletions

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mm/swapfile.c

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