Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild

[mirror_ubuntu-artful-kernel.git] / init / Kconfig

diff --git a/init/Kconfig b/init/Kconfig
index a9c4aefd5436edf12d6bda5ab775fbee3e7a8fd8..f755a602d4a176e006dc2cb5830d1c4812bac81f 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1306,6 +1306,17 @@ source "usr/Kconfig"
 
 endif
 
+choice
+       prompt "Compiler optimization level"
+       default CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
+
+config CC_OPTIMIZE_FOR_PERFORMANCE
+       bool "Optimize for performance"
+       help
+         This is the default optimization level for the kernel, building
+         with the "-O2" compiler flag for best performance and most
+         helpful compile-time warnings.
+
 config CC_OPTIMIZE_FOR_SIZE
        bool "Optimize for size"
        help
@@ -1314,6 +1325,8 @@ config CC_OPTIMIZE_FOR_SIZE
 
          If unsure, say N.
 
+endchoice
+
 config SYSCTL
        bool
 
@@ -2049,6 +2062,22 @@ config MODULE_COMPRESS_XZ
 
 endchoice
 
+config TRIM_UNUSED_KSYMS
+       bool "Trim unused exported kernel symbols"
+       depends on MODULES && !UNUSED_SYMBOLS
+       help
+         The kernel and some modules make many symbols available for
+         other modules to use via EXPORT_SYMBOL() and variants. Depending
+         on the set of modules being selected in your kernel configuration,
+         many of those exported symbols might never be used.
+
+         This option allows for unused exported symbols to be dropped from
+         the build. In turn, this provides the compiler more opportunities
+         (especially when using LTO) for optimizing the code and reducing
+         binary size.  This might have some security advantages as well.
+
+         If unsure say N.
+
 endif # MODULES
 
 config MODULES_TREE_LOOKUP