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bzip2/lzma: don't ask for compression mode for the default initramfs 

Impact: Kconfig noise reduction, documentation

The default initramfs is so small that it makes no sense to worry
about the additional memory taken by not double-compressing it.
Therefore, don't bug the user with it.

Also, improve the description of the option, which was downright
incorrect.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin 2009-03-28 17:24:03 -07:00
parent 55d1d26f23
commit 4029792757
1 changed files with 22 additions and 10 deletions
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32
usr/Kconfig
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@ -72,23 +72,24 @@ config RD_LZMA
Support loading of a LZMA encoded initial ramdisk or cpio buffer
If unsure, say N.
if INITRAMFS_SOURCE!=""
choice
prompt "Built-in initramfs compression mode"
help
This setting is only meaningful if the INITRAMFS_SOURCE is
set. It decides by which algorithm the INITRAMFS_SOURCE will
be compressed.
Several compression algorithms are available, which differ
in efficiency, compression and decompression speed.
Compression speed is only relevant when building a kernel.
Decompression speed is relevant at each boot.
This option decides by which algorithm the builtin initramfs
will be compressed. Several compression algorithms are
available, which differ in efficiency, compression and
decompression speed. Compression speed is only relevant
when building a kernel. Decompression speed is relevant at
each boot.
If you have any problems with bzip2 or LZMA compressed
initramfs, mail me (Alain Knaff) <alain@knaff.lu>.
High compression options are mostly useful for users who
are low on disk space (embedded systems), but for whom ram
size matters less.
High compression options are mostly useful for users who are
low on RAM, since it reduces the memory consumption during
boot.
If in doubt, select 'gzip'
@ -133,3 +134,14 @@ config INITRAMFS_COMPRESSION_LZMA
smaller with LZMA in comparison to gzip.
endchoice
endif
if INITRAMFS_SOURCE=""
# The builtin initramfs is so small so we don't want to bug the user...
config INITRAMFS_COMPRESSION_NONE
bool
default y
endif