Merge branch 'devel' into for-linus

[sfrench/cifs-2.6.git] / usr / Kconfig

diff --git a/usr/Kconfig b/usr/Kconfig
index 86cecb59dd0759ffedf3b551dd50f0a96fd3d2c7..588c588791e288a836931aae27ffa694bbd0c99f 100644 (file)
--- a/usr/Kconfig
+++ b/usr/Kconfig
@@ -44,3 +44,104 @@ config INITRAMFS_ROOT_GID
          owned by group root in the initial ramdisk image.
 
          If you are not sure, leave it set to "0".
+
+config RD_GZIP
+       bool "Support initial ramdisks compressed using gzip" if EMBEDDED
+       default y
+       depends on BLK_DEV_INITRD
+       select DECOMPRESS_GZIP
+       help
+         Support loading of a gzip encoded initial ramdisk or cpio buffer.
+         If unsure, say Y.
+
+config RD_BZIP2
+       bool "Support initial ramdisks compressed using bzip2" if EMBEDDED
+       default !EMBEDDED
+       depends on BLK_DEV_INITRD
+       select DECOMPRESS_BZIP2
+       help
+         Support loading of a bzip2 encoded initial ramdisk or cpio buffer
+         If unsure, say N.
+
+config RD_LZMA
+       bool "Support initial ramdisks compressed using LZMA" if EMBEDDED
+       default !EMBEDDED
+       depends on BLK_DEV_INITRD
+       select DECOMPRESS_LZMA
+       help
+         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 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 RAM, since it reduces the memory consumption during
+         boot.
+
+         If in doubt, select 'gzip'
+
+config INITRAMFS_COMPRESSION_NONE
+       bool "None"
+       help
+         Do not compress the built-in initramfs at all. This may
+         sound wasteful in space, but, you should be aware that the
+         built-in initramfs will be compressed at a later stage
+         anyways along with the rest of the kernel, on those
+         architectures that support this.
+         However, not compressing the initramfs may lead to slightly
+         higher memory consumption during a short time at boot, while
+         both the cpio image and the unpacked filesystem image will
+         be present in memory simultaneously
+
+config INITRAMFS_COMPRESSION_GZIP
+       bool "Gzip"
+       depends on RD_GZIP
+       help
+         The old and tried gzip compression. Its compression ratio is
+         the poorest among the 3 choices; however its speed (both
+         compression and decompression) is the fastest.
+
+config INITRAMFS_COMPRESSION_BZIP2
+       bool "Bzip2"
+       depends on RD_BZIP2
+       help
+         Its compression ratio and speed is intermediate.
+         Decompression speed is slowest among the three.  The initramfs
+         size is about 10% smaller with bzip2, in comparison to gzip.
+         Bzip2 uses a large amount of memory. For modern kernels you
+         will need at least 8MB RAM or more for booting.
+
+config INITRAMFS_COMPRESSION_LZMA
+       bool "LZMA"
+       depends on RD_LZMA
+       help
+         The most recent compression algorithm.
+         Its ratio is best, decompression speed is between the other
+         two. Compression is slowest.  The initramfs size is about 33%
+         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