kconfig option for TRIM_UNUSED_KSYMS

The config option to enable it all.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 16 insertions, 0 deletions

diff --git a/init/Kconfig b/init/Kconfig
index e0d26162432e..29d74d3f8044 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -2012,6 +2012,22 @@ 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