X-Git-Url: http://drtracing.org/?a=blobdiff_plain;ds=sidebyside;f=init%2FKconfig;h=c02d89777713b8772e47c2759570f4a838cb18e7;hb=b89c44bb233b51c3f03eaff22802a70036edf7cd;hp=a9c4aefd5436edf12d6bda5ab775fbee3e7a8fd8;hpb=28165ec7a99be98123aa89540bf2cfc24df19498;p=deliverable%2Flinux.git

diff --git a/init/Kconfig b/init/Kconfig
index a9c4aefd5436..c02d89777713 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
 
@@ -1445,6 +1458,7 @@ config KALLSYMS_ALL
 
 config KALLSYMS_ABSOLUTE_PERCPU
 	bool
+	depends on KALLSYMS
 	default X86_64 && SMP
 
 config KALLSYMS_BASE_RELATIVE
@@ -2049,6 +2063,22 @@ 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