Revert "lib/decompress_unlz4.c: always set an error return code on failures"

This reverts commit c11bc24269046f2f92a3fe1e733d5e7284cf0606.
Revert "Revert "lib/lz4/lz4_compress: fix macro usage error""

This reverts commit c130d718872e7243b4b800f813abdfc9651d0ee2.
Revert "zram_drv: switch default compressor to new lz4"

This reverts commit e22289914ff8b237df379add8896202a61f0c0e7.
Revert "staging: zram: add Crypto API support"

This reverts commit 8711edd8956c6b76966152e15f31685511dfa914.
Revert "zram: give up lazy initialization of zram metadata"

This reverts commit 4c5da968c20e086a4fb21f0f0600efb4c5a5696d.
Revert "zram: force disksize setting before using zram"

This reverts commit 7ec145790f55f642f4602058a17d1d535418ad87.
Revert "staging: zram: show correct disksize"

This reverts commit 0a9f08603487f7c771d534e715f7c472e09a8fb8.
Revert "staging: zram: simplify num_devices paramater"

This reverts commit 2e43327d69b4cfe391e9a0a7693c27838ba380b9.
Revert "zram: Fix deadlock bug in partial read/write"

This reverts commit a0300009ea0391541343ea28be386b5c4697ae0d.
Revert "staging: zram: fix invalid memory references during disk write"

This reverts commit f29afaaace5085c7fad999a8c1725e1ebf75ae2e.
Revert "staging: zram: factor-out zram_decompress_page() function"

This reverts commit 395231073be05155a5160cf8fd7525b8fb2780bc.
Revert "LZ4: compression/decompression signedness mismatch (v2)"

This reverts commit 725a63df2942f06c79e9c2f632f577698bd11616.
Revert "lib/lz4/lz4_compress: fix macro usage error"

This reverts commit 58419966b8c0725689f9676a9c90ed12d378f5af.
Revert "crypto: Add lz4 Cryptographic API"

This reverts commit 5aa63a7176d184f3faec7d0377336ee6fa30b030.
Revert "lib: Add lz4 compressor module"

This reverts commit 3aa78c62b3132125095026d44737d43c84f41f8e.