linux-kernel - [PATCH v7 8/8] kconfig option for TRIM_UNUSED

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Message-Id: <1459284282-6676-9-git-send-email-nicolas.pitre@linaro.org>
Date:	Tue, 29 Mar 2016 16:44:42 -0400
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Michal Marek <mmarek@...e.com>
Cc:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v7 8/8] kconfig option for TRIM_UNUSED_KSYMS

The config option to enable it all.

Signed-off-by: Nicolas Pitre <nico@...aro.org>
Acked-by: Rusty Russell <rusty@...tcorp.com.au>
---
 init/Kconfig | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/init/Kconfig b/init/Kconfig
index e0d2616243..29d74d3f80 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
-- 
2.5.5