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Message-id: <1455080908-22272-7-git-send-email-nicolas.pitre@linaro.org> Date: Wed, 10 Feb 2016 00:08:28 -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 v2 6/6] 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 22320804fb..e6f666331b 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1990,6 +1990,22 @@ 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 -- 2.5.0
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