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kconfig option for TRIM_UNUSED_KSYMS

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The config option to enable it all.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Nicolas Pitre 2016-01-26 21:51:05 -05:00
parent dd92478a15
commit dbacb0ef67
1 changed files with 16 additions and 0 deletions
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init/Kconfig
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@ -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