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From: Valdis Kletnieks <>
To: Andrew Morton <>
Subject: [PATCH] init/Kconfig - add clarification for out-of-tree modules
Date: Fri, 29 Jul 2016 06:14:52 -0400
Message-ID: <> (raw)

It doesn't trim just symbols that are totally unused in-tree - it trims the
symbols unused by any in-tree modules actually built.  If you've done
a 'make localmodconfig' and only build a hundred or so modules, it's pretty
likely that your out-of-tree module will come up lacking something...

Hopefully this will save the next guy from a Homer Simpson "D'oh!" moment.

Signed-off-by: Valdis Kletnieks <>
diff --git a/init/Kconfig b/init/Kconfig
index 55c07b855e90..b4c9eb8119c0 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -2083,7 +2083,7 @@ config TRIM_UNUSED_KSYMS
 	  (especially when using LTO) for optimizing the code and reducing
 	  binary size.  This might have some security advantages as well.
-	  If unsure say N.
+	  If unsure, or if you need to build out-of-tree modules, say N.
 endif # MODULES

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