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From: Nicolas Pitre <nicolas.pitre@linaro.org>
To: Michal Marek <mmarek@suse.com>
Cc: linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v6 8/8] kconfig option for TRIM_UNUSED_KSYMS
Date: Sun, 13 Mar 2016 22:42:16 -0400	[thread overview]
Message-ID: <1457923336-2732-9-git-send-email-nicolas.pitre@linaro.org> (raw)
In-Reply-To: <1457923336-2732-1-git-send-email-nicolas.pitre@linaro.org>

The config option to enable it all.

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

      parent reply	other threads:[~2016-03-14  2:43 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-14  2:42 [PATCH v6 0/8]/[PULL REQUEST] Trim unused exported kernel symbols Nicolas Pitre
2016-03-14  2:42 ` [PATCH v6 1/8] kbuild: record needed exported symbols for modules Nicolas Pitre
2016-03-14  2:42 ` [PATCH v6 2/8] allow for per-symbol configurable EXPORT_SYMBOL() Nicolas Pitre
2016-03-14  2:42 ` [PATCH v6 3/8] fixdep: accept extra dependencies on stdin Nicolas Pitre
2016-03-14  2:42 ` [PATCH v6 4/8] kbuild: de-duplicate fixdep usage Nicolas Pitre
2016-03-14  2:42 ` [PATCH v6 5/8] kbuild: add fine grained build dependencies for exported symbols Nicolas Pitre
2016-03-15 20:33   ` Michal Marek
2016-03-15 20:34     ` Michal Marek
     [not found]     ` <fvfraWW5gnPSEfvfsaDPXE@videotron.ca>
2016-03-15 23:14       ` Nicolas Pitre
2016-03-16 12:29         ` Michal Marek
2016-03-16 15:05           ` Nicolas Pitre
2016-03-14  2:42 ` [PATCH v6 6/8] create/adjust generated/autoksyms.h Nicolas Pitre
2016-03-14  2:42 ` [PATCH v6 7/8] kbuild: build sample modules along with the rest of the kernel Nicolas Pitre
2016-03-14  2:42 ` Nicolas Pitre [this message]

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