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-rw-r--r--init/Kconfig29
1 files changed, 29 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index a9c4aefd5436..f755a602d4a1 100644
--- 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