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Message-id: <1454963315-20468-7-git-send-email-nicolas.pitre@linaro.org>
Date: Mon, 08 Feb 2016 15:28:35 -0500
From: Nicolas Pitre <nicolas.pitre@...aro.org>
To: Michal Marek <mmarek@...e.com>, linux-kbuild@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Al Viro <viro@...IV.linux.org.uk>,
Rusty Russell <rusty@...tcorp.com.au>
Subject: [PATCH 6/6] kconfig option for TRIM_UNUSED_EXPSYMS
The config option to enable it all.
Signed-off-by: Nicolas Pitre <nico@...aro.org>
---
init/Kconfig | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/init/Kconfig b/init/Kconfig
index 22320804fb..893c4979a9 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1990,6 +1990,22 @@ config MODULE_COMPRESS_XZ
endchoice
+config TRIM_UNUSED_EXPSYMS
+ bool "Trim unused exported 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
--
2.5.0
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