Commit 9ba4bcb6 authored by P J P's avatar P J P Committed by Linus Torvalds

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: 's avatarP J P <prasad@redhat.com>
Signed-off-by: 's avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ba24762b
......@@ -240,12 +240,24 @@ case "$arg" in
output_file="$1"
cpio_list="$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)"
output=${cpio_list}
echo "$output_file" | grep -q "\.gz$" && compr="gzip -n -9 -f"
echo "$output_file" | grep -q "\.bz2$" && compr="bzip2 -9 -f"
echo "$output_file" | grep -q "\.lzma$" && compr="lzma -9 -f"
echo "$output_file" | grep -q "\.xz$" && \
compr="xz --check=crc32 --lzma2=dict=1MiB"
echo "$output_file" | grep -q "\.lzo$" && compr="lzop -9 -f"
echo "$output_file" | grep -q "\.gz$" \
&& [ -x "`which gzip 2> /dev/null`" ] \
&& compr="gzip -n -9 -f"
echo "$output_file" | grep -q "\.bz2$" \
&& [ -x "`which bzip2 2> /dev/null`" ] \
&& compr="bzip2 -9 -f"
echo "$output_file" | grep -q "\.lzma$" \
&& [ -x "`which lzma 2> /dev/null`" ] \
&& compr="lzma -9 -f"
echo "$output_file" | grep -q "\.xz$" \
&& [ -x "`which xz 2> /dev/null`" ] \
&& compr="xz --check=crc32 --lzma2=dict=1MiB"
echo "$output_file" | grep -q "\.lzo$" \
&& [ -x "`which lzop 2> /dev/null`" ] \
&& compr="lzop -9 -f"
echo "$output_file" | grep -q "\.lz4$" \
&& [ -x "`which lz4 2> /dev/null`" ] \
&& compr="lz4 -9 -f"
echo "$output_file" | grep -q "\.cpio$" && compr="cat"
shift
;;
......
......@@ -6,20 +6,23 @@ klibcdirs:;
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 @@ endif
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 @@ $(deps_initramfs): klibcdirs
$(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs
$(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d
$(call if_changed,initfs)
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