init/Kconfig: add option to disable kernel compression

Some ARC users say they can boot faster with without kernel compression.
This probably depends on things like the FLASH chip they use etc.

Until now, kernel compression can only be disabled by removing "select
HAVE_<compression>" lines from the architecture Kconfig.  So add the
Kconfig logic to permit disabling of kernel compression.

Signed-off-by: Christian Ruppert <christian.ruppert@abilis.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/init/Kconfig b/init/Kconfig
index bc8911f..5496f30 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -118,7 +118,6 @@ config HAVE_KERNEL_LZ4
 choice
        prompt "Kernel compression mode"
        default KERNEL_GZIP
-       depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO || HAVE_KERNEL_LZ4
        help
          The linux kernel is a kind of self-extracting executable.
          Several compression algorithms are available, which differ
@@ -137,6 +136,13 @@ choice
 
          If in doubt, select 'gzip'
 
+config KERNEL_UNCOMPRESSED
+       bool "No compression"
+       help
+         No compression at all. The kernel is huge but the compression and
+         decompression times are zero.
+         This is usually not what you want.
+
 config KERNEL_GZIP
        bool "Gzip"
        depends on HAVE_KERNEL_GZIP