[PATCH] init: add support for zstd compressed modules

From: ">" <lucjan.lucjanov@gmail.com>
To: linux-kbuild@vger.kernel.org
Cc: Piotr Gorski <lucjan.lucjanov@gmail.com>
Subject: [PATCH] init: add support for zstd compressed modules
Date: Wed, 13 Jan 2021 15:50:56 +0100	[thread overview]
Message-ID: <20210113145056.834091-1-lucjan.lucjanov@gmail.com> (raw)

From: Piotr Gorski <lucjan.lucjanov@gmail.com>

kmod 28 supports modules compressed in zstd format so let's add this possibility to kernel.

Signed-off-by: Piotr Gorski <lucjan.lucjanov@gmail.com>
---
 Makefile     | 7 +++++--
 init/Kconfig | 9 ++++++---
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index cf54d33ba863..90986a3f5897 100644
--- a/Makefile
+++ b/Makefile
@@ -1049,8 +1049,8 @@ endif # INSTALL_MOD_STRIP
 export mod_strip_cmd
 
 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
-# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
-# or CONFIG_MODULE_COMPRESS_XZ.
+# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP,
+# CONFIG_MODULE_COMPRESS_XZ, or CONFIG_MODULE_COMPRESS_ZSTD.
 
 mod_compress_cmd = true
 ifdef CONFIG_MODULE_COMPRESS
@@ -1060,6 +1060,9 @@ ifdef CONFIG_MODULE_COMPRESS
   ifdef CONFIG_MODULE_COMPRESS_XZ
     mod_compress_cmd = $(XZ) --lzma2=dict=2MiB -f
   endif # CONFIG_MODULE_COMPRESS_XZ
+  ifdef CONFIG_MODULE_COMPRESS_ZSTD
+    mod_compress_cmd = $(ZSTD) -T0 -9 --rm -f
+  endif # CONFIG_MODULE_COMPRESS_ZSTD
 endif # CONFIG_MODULE_COMPRESS
 export mod_compress_cmd
 
diff --git a/init/Kconfig b/init/Kconfig
index b77c60f8b963..11d7dfea98b6 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -2216,8 +2216,8 @@ config MODULE_COMPRESS
 	bool "Compress modules on installation"
 	help
 
-	  Compresses kernel modules when 'make modules_install' is run; gzip or
-	  xz depending on "Compression algorithm" below.
+	  Compresses kernel modules when 'make modules_install' is run; gzip,
+	  xz, or zstd depending on "Compression algorithm" below.
 
 	  module-init-tools MAY support gzip, and kmod MAY support gzip and xz.
 
@@ -2239,7 +2239,7 @@ choice
 	  This determines which sort of compression will be used during
 	  'make modules_install'.
 
-	  GZIP (default) and XZ are supported.
+	  GZIP (default), XZ, and ZSTD are supported.
 
 config MODULE_COMPRESS_GZIP
 	bool "GZIP"
@@ -2247,6 +2247,9 @@ config MODULE_COMPRESS_GZIP
 config MODULE_COMPRESS_XZ
 	bool "XZ"
 
+config MODULE_COMPRESS_ZSTD
+	bool "ZSTD"
+
 endchoice
 
 config MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS
-- 
2.30.0.81.g72c4083ddf

