linux-kernel - [PATCH] init/Kconfig - add clarification for out-of-tree modules

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Message-ID: <10177.1469787292@turing-police.cc.vt.edu>
Date:	Fri, 29 Jul 2016 06:14:52 -0400
From:	Valdis Kletnieks <Valdis.Kletnieks@...edu>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] init/Kconfig - add clarification for out-of-tree modules

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 <valdis.kletnieks@...edu>
---
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