bzip2/lzma: make config machinery an arch configurable

Impact: Bug fix (we should not show this menu on irrelevant architectures)

Make the config machinery to drive the gzip/bzip2/lzma selection
dependent on the architecture advertising HAVE_KERNEL_* so that we
don't display this for architectures where it doesn't matter.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 862adb9..7b66c34 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -39,6 +39,9 @@ config X86
        select HAVE_GENERIC_DMA_COHERENT if X86_32
        select HAVE_EFFICIENT_UNALIGNED_ACCESS
        select USER_STACKTRACE_SUPPORT
+       select HAVE_KERNEL_GZIP
+       select HAVE_KERNEL_BZIP2
+       select HAVE_KERNEL_LZMA
 
 config ARCH_DEFCONFIG
        string

diff --git a/init/Kconfig b/init/Kconfig
index df84625..f9633c0 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -101,10 +101,20 @@ config LOCALVERSION_AUTO
 
          which is done within the script "scripts/setlocalversion".)
 
+config HAVE_KERNEL_GZIP
+       bool
+
+config HAVE_KERNEL_BZIP2
+       bool
+
+config HAVE_KERNEL_LZMA
+       bool
+
 choice
-        prompt "Kernel compression mode"
-        default KERNEL_GZIP
-        help
+       prompt "Kernel compression mode"
+       default KERNEL_GZIP
+       depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA
+       help
          The linux kernel is a kind of self-extracting executable.
          Several compression algorithms are available, which differ
          in efficiency, compression and decompression speed.
@@ -123,34 +133,34 @@ choice
          If in doubt, select 'gzip'
 
 config KERNEL_GZIP
-       bool "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.
+       bool "Gzip"
+       depends on HAVE_KERNEL_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 KERNEL_BZIP2
        bool "Bzip2"
+       depends on HAVE_KERNEL_BZIP2
        help
          Its compression ratio and speed is intermediate.
-         Decompression speed is slowest among the 3.
-         The kernel size is about 10 per cent 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.
+         Decompression speed is slowest among the three.  The kernel
+         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 KERNEL_LZMA
-       bool "LZMA"
-       help
-         The most recent compression algorithm.
-        Its ratio is best, decompression speed is between the other
-        2. Compression is slowest.
-        The kernel size is about 33 per cent smaller with lzma,
-        in comparison to gzip.
+       bool "LZMA"
+       depends on HAVE_KERNEL_LZMA
+       help
+         The most recent compression algorithm.
+         Its ratio is best, decompression speed is between the other
+         two. Compression is slowest.  The kernel size is about 33%
+         smaller with LZMA in comparison to gzip.
 
 endchoice
 
-
 config SWAP
        bool "Support for paging of anonymous memory (swap)"
        depends on MMU && BLOCK