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authorLasse Collin <lasse.collin@tukaani.org>2011-01-13 04:01:23 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 19:03:25 +0300
commit3ebe12439ba7fc62e1d6ecb569b7287771716ca1 (patch)
tree65945a63ad1474489d80c8ca1fb1c1c8091fb7a2 /usr/Makefile
parent24fa0402a9b6a537e87e38341e78b7da86486846 (diff)
downloadlinux-3ebe12439ba7fc62e1d6ecb569b7287771716ca1.tar.xz
decompressors: add boot-time XZ support
This implements the API defined in <linux/decompress/generic.h> which is used for kernel, initramfs, and initrd decompression. This patch together with the first patch is enough for XZ-compressed initramfs and initrd; XZ-compressed kernel will need arch-specific changes. The buffering requirements described in decompress_unxz.c are stricter than with gzip, so the relevant changes should be done to the arch-specific code when adding support for XZ-compressed kernel. Similarly, the heap size in arch-specific pre-boot code may need to be increased (30 KiB is enough). The XZ decompressor needs memmove(), memeq() (memcmp() == 0), and memzero() (memset(ptr, 0, size)), which aren't available in all arch-specific pre-boot environments. I'm including simple versions in decompress_unxz.c, but a cleaner solution would naturally be nicer. Signed-off-by: Lasse Collin <lasse.collin@tukaani.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Alain Knaff <alain@knaff.lu> Cc: Albin Tonnerre <albin.tonnerre@free-electrons.com> Cc: Phillip Lougher <phillip@lougher.demon.co.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'usr/Makefile')
-rw-r--r--usr/Makefile5
1 files changed, 4 insertions, 1 deletions
diff --git a/usr/Makefile b/usr/Makefile
index 6faa444b7087..029ffe6cd0d8 100644
--- a/usr/Makefile
+++ b/usr/Makefile
@@ -15,6 +15,9 @@ suffix_$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) = .bz2
# Lzma
suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZMA) = .lzma
+# XZ
+suffix_$(CONFIG_INITRAMFS_COMPRESSION_XZ) = .xz
+
# Lzo
suffix_$(CONFIG_INITRAMFS_COMPRESSION_LZO) = .lzo
@@ -50,7 +53,7 @@ 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.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
# do not try to update files included in initramfs
$(deps_initramfs): ;