linux-kernel - [PATCH 1/2] kbuild: allow setting zstd compression level for modules

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Date:   Fri, 9 Apr 2021 15:28:23 +0200 (CEST)
From:   torvic9@...lbox.org
To:     "linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
        "masahiroy@...nel.org" <masahiroy@...nel.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Piotr Górski <lucjan.lucjanov@...il.com>
Subject: [PATCH 1/2] kbuild: allow setting zstd compression level for
 modules

Zstd offers a very fine-grained control of compression ratios.
Add a Kconfig option that allows setting the desired compression
level for module compression.

Based on Masahiro's linux-kbuild.

Signed-off-by: Tor Vic <torvic9@...lbox.org>
Tested-by: Piotr Gorski <lucjan.lucjanov@...il.com>
---
 init/Kconfig             | 8 ++++++++
 scripts/Makefile.modinst | 2 +-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/init/Kconfig b/init/Kconfig
index b5744d32c..15bb02c24 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -2275,6 +2275,14 @@ 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_ALLOW_MISSING_NAMESPACE_IMPORTS
 	bool "Allow loading of modules with missing namespace imports"
 	help
diff --git a/scripts/Makefile.modinst b/scripts/Makefile.modinst
index ff9b09e4c..0a0db2278 100644
--- a/scripts/Makefile.modinst
+++ b/scripts/Makefile.modinst
@@ -97,7 +97,7 @@ 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)
-- 
2.31.1