[PATCH RFC 0/9] lib/lz4: stop forking upstream LZ4, vendor it instead

[Sergey Senozhatsky]

On (26/09/25 13:27), Michal Wilczynski wrote:
[..]
> Michal Wilczynski (9):
>       lib/lz4: import upstream LZ4 sources verbatim
>       lib/lz4: backport upstream's -Wmissing-prototypes fix
>       lib/lz4: add the build environment for the vendored sources
>       arch: boot: put the LZ4 freestanding headers on the decompressor path
>       lib/lz4: switch the compressor to the vendored sources
>       lib/lz4: switch the HC compressor to the vendored sources
>       lib/lz4: switch the decompressor to the vendored sources
>       lib/lz4: fold lz4_kernel_api.h into <linux/lz4.h>
>       MAINTAINERS: add an entry for the LZ4 compression library

On my x86_64 build .text size change seems to be quite significant:

 ./scripts/bloat-o-meter lib/lz4/lz4_compress-old.ko lib/lz4/lz4_compress.ko
add/remove: 0/2 grow/shrink: 5/1 up/down: 8022/-1755 (6267)
Function                                     old     new   delta
LZ4_compress_fast_continue                  6028   10486   +4458
LZ4_compress_destSize                        158    3112   +2954
LZ4_compress_fast_extState                  4078    4597    +519
LZ4_saveDict                                  82     153     +71
__UNIQUE_ID_modinfo_466                       52      72     +20
__pfx_LZ4_compress_destSize_generic           16       -     -16
LZ4_loadDict                                 261     204     -57
LZ4_compress_destSize_generic               1682       -   -1682
Total: Before=14756, After=21023, chg +42.47%