mm: kill frontswap

The only user of frontswap is zswap, and has been for a long time.  Have
swap call into zswap directly and remove the indirection.

[[email protected]: remove obsolete comment, per Yosry]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: don't warn if none swapcache folio is passed to zswap_load]
  Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Johannes Weiner <[email protected]>
Signed-off-by: Yin Fengwei <[email protected]>
Acked-by: Konrad Rzeszutek Wilk <[email protected]>
Acked-by: Nhat Pham <[email protected]>
Acked-by: Yosry Ahmed <[email protected]>
Acked-by: Christoph Hellwig <[email protected]>
Cc: Domenico Cerasuolo <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Vitaly Wool <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions