[PATCH] [FIX] init/Kconfig: fix option to disable kernel compression

[Christian Ruppert <christian.ruppert@abilis.com>]

Some architectures with self-decompressing kernel images did not compile
with commit 69f0554ec261fd686ac7fa1c598cc9eb27b83a80 because they don't
provide a non-decompression mechanism for uncompressed kernels.

Rectify this problem by allowing uncompressed kernels only for architectures
which explicitly state they support them.

Signed-off-by: Christian Ruppert <christian.ruppert@abilis.com>
---
 arch/arc/Kconfig | 2 ++
 init/Kconfig     | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 2ee0c9b..15f4c3d 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -21,6 +21,8 @@ config ARC
 	select HAVE_ARCH_KGDB
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_IOREMAP_PROT
+	select HAVE_KERNEL_UNCOMPRESSED
+	select HAVE_KERNEL_GZIP
 	select HAVE_KPROBES
 	select HAVE_KRETPROBES
 	select HAVE_MEMBLOCK
diff --git a/init/Kconfig b/init/Kconfig
index 5496f30..d4baf2e 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -97,6 +97,9 @@ config LOCALVERSION_AUTO
 
 	  which is done within the script "scripts/setlocalversion".)
 
+config HAVE_KERNEL_UNCOMPRESSED
+        bool
+
 config HAVE_KERNEL_GZIP
 	bool
 
@@ -118,6 +121,7 @@ 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 || HAVE_KERNEL_UNCOMPRESSED
 	help
 	  The linux kernel is a kind of self-extracting executable.
 	  Several compression algorithms are available, which differ
@@ -138,6 +142,7 @@ choice
 
 config KERNEL_UNCOMPRESSED
 	bool "No compression"
+	depends on HAVE_KERNEL_UNCOMPRESSED
 	help
 	  No compression at all. The kernel is huge but the compression and
 	  decompression times are zero.
-- 
1.8.4