kbuild: handle module compression while running 'make modules_install'.

[mirror_ubuntu-artful-kernel.git] / init / Kconfig

diff --git a/init/Kconfig b/init/Kconfig
index e84c6423a2e5a2dbe80157b13f8b16d17c3e2d06..4980925bf348beb26c08c4ec424ed78c739ea511 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1906,6 +1906,49 @@ config MODULE_SIG_HASH
        default "sha384" if MODULE_SIG_SHA384
        default "sha512" if MODULE_SIG_SHA512
 
+config MODULE_COMPRESS
+       bool "Compress modules on installation"
+       depends on MODULES
+       help
+         This option compresses the kernel modules when 'make
+         modules_install' is run.
+
+         The modules will be compressed either using gzip or xz depend on the
+         choice made in "Compression algorithm".
+
+         module-init-tools has support for gzip format while kmod handle gzip
+         and xz compressed modules.
+
+         When a kernel module is installed from outside of the main kernel
+         source and uses the Kbuild system for installing modules then that
+         kernel module will also be compressed when it is installed.
+
+         This option provides little benefit when the modules are to be used inside
+         an initrd or initramfs, it generally is more efficient to compress the whole
+         initrd or initramfs instead.
+
+         This is fully compatible with signed modules while the signed module is
+         compressed. module-init-tools or kmod handles decompression and provide to
+         other layer the uncompressed but signed payload.
+
+choice
+       prompt "Compression algorithm"
+       depends on MODULE_COMPRESS
+       default MODULE_COMPRESS_GZIP
+       help
+         This determines which sort of compression will be used during
+         'make modules_install'.
+
+         GZIP (default) and XZ are supported.
+
+config MODULE_COMPRESS_GZIP
+       bool "GZIP"
+
+config MODULE_COMPRESS_XZ
+       bool "XZ"
+
+endchoice
+
 endif # MODULES
 
 config INIT_ALL_POSSIBLE