From: "torvic9@xxxxxxxxxxx" <torvic9@xxxxxxxxxxx>
Zstd offers a very fine-grained control of compression ratios.
Add a Kconfig option that allows setting the desired compression
level for module compression.
Signed-off-by: Tor Vic <torvic9@xxxxxxxxxxx>
Tested-by: Piotr Gorski <lucjan.lucjanov@xxxxxxxxx>
Tested-by: Maximilian Bosch <maximilian@xxxxxxxxx>
---
kernel/module/Kconfig | 8 ++++++++
scripts/Makefile.modinst | 2 +-
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/kernel/module/Kconfig b/kernel/module/Kconfig
index 33a2e991f608..076b18dd3941 100644
--- a/kernel/module/Kconfig
+++ b/kernel/module/Kconfig
@@ -317,6 +317,14 @@ config MODULE_COMPRESS_ZSTD
endchoice
+config MODULE_COMPRESS_ZSTD_LEVEL
+ int "Compression level (1-19)"
+ depends on MODULE_COMPRESS_ZSTD
+ range 1 19
+ default 3
+ help
+ Compression level used by zstd for compressing modules.
+
config MODULE_DECOMPRESS
bool "Support in-kernel module decompression"
depends on MODULE_COMPRESS_GZIP || MODULE_COMPRESS_XZ || MODULE_COMPRESS_ZSTD
diff --git a/scripts/Makefile.modinst b/scripts/Makefile.modinst
index ab0c5bd1a60f..480d47eca36a 100644
--- a/scripts/Makefile.modinst
+++ b/scripts/Makefile.modinst
@@ -101,7 +101,7 @@ quiet_cmd_gzip = GZIP $@
quiet_cmd_xz = XZ $@
cmd_xz = $(XZ) --lzma2=dict=2MiB -f $<
quiet_cmd_zstd = ZSTD $@
- cmd_zstd = $(ZSTD) -T0 --rm -f -q $<
+ cmd_zstd = $(ZSTD) -$(CONFIG_MODULE_COMPRESS_ZSTD_LEVEL) -T0 --rm -f -q $<
$(dst)/%.ko.gz: $(dst)/%.ko FORCE
$(call cmd,gzip)
--
2.42.0
