initramfs: do not show compression mode choice if INITRAMFS_SOURCE is…

… empty Since commit ddd09bc ("initramfs: make compression options not depend on INITRAMFS_SOURCE"), Kconfig asks the compression mode for the built-in initramfs regardless of INITRAMFS_SOURCE. It is technically simpler, but pointless from a UI perspective, Linus says [1]. When INITRAMFS_SOURCE is empty, usr/Makefile creates a tiny default cpio, which is so small that nobody cares about the compression. This commit hides the Kconfig choice in that case. The default cpio is embedded without compression, which was the original behavior. [1]: https://lkml.org/lkml/2020/2/1/160 Suggested-by: Linus Torvalds <[email protected]> Signed-off-by: Masahiro Yamada <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
torvalds · Feb 3, 2020 · d4e9056 · d4e9056
1 parent ad80142
commit d4e9056
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diff --git a/usr/Kconfig b/usr/Kconfig
@@ -102,6 +102,7 @@ config RD_LZ4
 
 choice
 	prompt "Built-in initramfs compression mode"
+	depends on INITRAMFS_SOURCE != ""
 	help
 	  This option allows you to decide by which algorithm the builtin
 	  initramfs will be compressed.  Several compression algorithms are

diff --git a/usr/Makefile b/usr/Makefile
@@ -8,7 +8,7 @@
 # with unpack_to_rootfs(). Make size_append no-op.
 override size_append := :
 
-compress-$(CONFIG_INITRAMFS_COMPRESSION_NONE)	:= shipped
+compress-y					:= shipped
 compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP)	:= gzip
 compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2)	:= bzip2
 compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA)	:= lzma