initramfs: read CONFIG_RD_ variables for initramfs compression
When expert configuration option(CONFIG_EXPERT) is enabled, menuconfig
offers a choice of compression algorithm to compress initial ramfs image;
This choice is stored into CONFIG_RD_* variables. But usr/Makefile uses
earlier INITRAMFS_COMPRESSION_* macros to build initial ramfs file. Since
none of them is defined, resulting 'initramfs_data.cpio' file remains
un-compressed.
This patch updates the Makefile to use CONFIG_RD_* variables and adds
support for LZ4 compression algorithm. Also updates the
'gen_initramfs_list.sh' script to check whether a selected compression
command is accessible or not. And fall-back to default gzip(1)
compression when it is not.
Signed-off-by: P J P <prasad@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/usr/Makefile b/usr/Makefile
index 029ffe6..e767f01 100644
--- a/usr/Makefile
+++ b/usr/Makefile
@@ -6,20 +6,23 @@
PHONY += klibcdirs
-# Gzip
-suffix_$(CONFIG_INITRAMFS_COMPRESSION_GZIP) = .gz
-
# Bzip2
-suffix_$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) = .bz2
+suffix_$(CONFIG_RD_BZIP2) = .bz2
# Lzma
-suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZMA) = .lzma
+suffix_$(CONFIG_RD_LZMA) = .lzma
# XZ
-suffix_$(CONFIG_INITRAMFS_COMPRESSION_XZ) = .xz
+suffix_$(CONFIG_RD_XZ) = .xz
# Lzo
-suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZO) = .lzo
+suffix_$(CONFIG_RD_LZO) = .lzo
+
+# Lz4
+suffix_$(CONFIG_RD_LZ4) = .lz4
+
+# Gzip
+suffix_$(CONFIG_RD_GZIP) = .gz
AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/initramfs_data.cpio$(suffix_y)"
@@ -53,7 +56,10 @@
quiet_cmd_initfs = GEN $@
cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input)
-targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 initramfs_data.cpio.lzma initramfs_data.cpio.xz initramfs_data.cpio.lzo initramfs_data.cpio
+targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 \
+ initramfs_data.cpio.lzma initramfs_data.cpio.xz \
+ initramfs_data.cpio.lzo initramfs_data.cpio.lz4 \
+ initramfs_data.cpio
# do not try to update files included in initramfs
$(deps_initramfs): ;
@@ -66,4 +72,3 @@
$(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
$(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
$(call if_changed,initfs)
-
