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./Makefile: export initial ramdisk compression config option 

Make menuconfig allows one to choose compression format of an initial
ramdisk image.  But this choice does not result in duly compressed ramdisk
image.  Because - $ make install - does not pass on the selected
compression choice to the dracut(8) tool, which creates the initramfs
file.  dracut(8) generates the image with the default compression, ie.
gzip(1).

This patch exports the selected compression option to a sub-shell
environment, so that it could be used by dracut(8) tool to generate
appropriately compressed initramfs images.

There isn't a straightforward way to pass on options to dracut(8) via
positional parameters.  Because it is indirectly invoked at the end of a $
make install sequence.

 # make install
   -> arch/$arch/boot/Makefile
    -> arch/$arch/boot/install.sh
     -> /sbing/installkernel ...
      -> /sbin/new-kernel-pkg ...
       -> /sbin/dracut ...

Signed-off-by: P J P <ppandit@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
P J P 2013-11-12 15:11:44 -08:00 committed by Linus Torvalds
parent 69f0554ec2
commit 1bf49dd4be
2 changed files with 21 additions and 0 deletions
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16
Makefile
View File

@ -720,6 +720,22 @@ mod_strip_cmd = true
endif # INSTALL_MOD_STRIP
export mod_strip_cmd
# Select initial ramdisk compression format, default is gzip(1).
# This shall be used by the dracut(8) tool while creating an initramfs image.
#
INITRD_COMPRESS=gzip
ifeq ($(CONFIG_RD_BZIP2), y)
INITRD_COMPRESS=bzip2
else ifeq ($(CONFIG_RD_LZMA), y)
INITRD_COMPRESS=lzma
else ifeq ($(CONFIG_RD_XZ), y)
INITRD_COMPRESS=xz
else ifeq ($(CONFIG_RD_LZO), y)
INITRD_COMPRESS=lzo
else ifeq ($(CONFIG_RD_LZ4), y)
INITRD_COMPRESS=lz4
endif
export INITRD_COMPRESS
ifdef CONFIG_MODULE_SIG_ALL
MODSECKEY = ./signing_key.priv

5
init/do_mounts_rd.c
View File

@ -57,6 +57,11 @@ static int __init crd_load(int in_fd, int out_fd, decompress_fn deco);
* cramfs
* squashfs
* gzip
* bzip2
* lzma
* xz
* lzo
* lz4
*/
static int __init
identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)