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".
          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