lib: add support for LZ4-compressed kernel

[cascardo/linux.git] / init / Kconfig

diff --git a/init/Kconfig b/init/Kconfig
index 118895c..54d3fa5 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -112,10 +112,13 @@ config HAVE_KERNEL_XZ
 config HAVE_KERNEL_LZO
        bool
 
+config HAVE_KERNEL_LZ4
+       bool
+
 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
+       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
@@ -182,6 +185,18 @@ config KERNEL_LZO
          size is about 10% bigger than gzip; however its speed
          (both compression and decompression) is the fastest.
 
+config KERNEL_LZ4
+       bool "LZ4"
+       depends on HAVE_KERNEL_LZ4
+       help
+         LZ4 is an LZ77-type compressor with a fixed, byte-oriented encoding.
+         A preliminary version of LZ4 de/compression tool is available at
+         <https://code.google.com/p/lz4/>.
+
+         Its compression ratio is worse than LZO. The size of the kernel
+         is about 8% bigger than LZO. But the decompression speed is
+         faster than LZO.
+
 endchoice
 
 config DEFAULT_HOSTNAME
@@ -780,6 +795,9 @@ config LOG_BUF_SHIFT
 config HAVE_UNSTABLE_SCHED_CLOCK
        bool
 
+config GENERIC_SCHED_CLOCK
+       bool
+
 #
 # For architectures that want to enable the support for NUMA-affine scheduler
 # balancing logic:
@@ -899,7 +917,7 @@ config MEMCG
 
          Note that setting this option increases fixed memory overhead
          associated with each page of memory in the system. By this,
-         20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory
+         8(16)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory
          usage tracking struct at boot. Total amount of this is printed out
          at boot.