initramfs: restore default compression behavior

Even though INITRAMFS_SOURCE kconfig option isn't set in most of
defconfigs it is used (set) extensively by various build systems.
Commit 778e942b1f13 ("initramfs: make initramfs compression choice
non-optional") has changed default compression mode. Previously we
compress initramfs using available compression algorithm. Now
we don't use any compression at all by default.
It significantly increases the image size in case of build system
chooses embedded initramfs. Initially I faced with this issue while
using buildroot.

As of today it's not possible to set preferred compression mode
in target defconfig as this option depends on INITRAMFS_SOURCE
being set. Modification of all build systems either doesn't look
like good option.

Let's instead rewrite initramfs compression mode choices list
the way that "INITRAMFS_COMPRESSION_NONE" will be the last option
in the list. In that case it will be chosen only if all other
options (which implements any compression) are not available.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

diff --git a/usr/Kconfig b/usr/Kconfig
index bdf5bbd40727e7bd3af324ea8c37894c732d5993..96afb03b65f97db76091de047b98b1ba409c92ea 100644 (file)
--- a/usr/Kconfig
+++ b/usr/Kconfig
@@ -124,17 +124,6 @@ choice
 
          If in doubt, select 'None'
 
-config INITRAMFS_COMPRESSION_NONE
-       bool "None"
-       help
-         Do not compress the built-in initramfs at all. This may sound wasteful
-         in space, but, you should be aware that the built-in initramfs will be
-         compressed at a later stage anyways along with the rest of the kernel,
-         on those architectures that support this. However, not compressing the
-         initramfs may lead to slightly higher memory consumption during a
-         short time at boot, while both the cpio image and the unpacked
-         filesystem image will be present in memory simultaneously
-
 config INITRAMFS_COMPRESSION_GZIP
        bool "Gzip"
        depends on RD_GZIP
@@ -207,4 +196,15 @@ config INITRAMFS_COMPRESSION_LZ4
          If you choose this, keep in mind that most distros don't provide lz4
          by default which could cause a build failure.
 
+config INITRAMFS_COMPRESSION_NONE
+       bool "None"
+       help
+         Do not compress the built-in initramfs at all. This may sound wasteful
+         in space, but, you should be aware that the built-in initramfs will be
+         compressed at a later stage anyways along with the rest of the kernel,
+         on those architectures that support this. However, not compressing the
+         initramfs may lead to slightly higher memory consumption during a
+         short time at boot, while both the cpio image and the unpacked
+         filesystem image will be present in memory simultaneously
+
 endchoice