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Date:	Fri, 14 Feb 2014 22:21:42 +0100
From:	Andi Kleen <>
	Andi Kleen <>,
Subject: [PATCH 18/19] lto, module: Warn about modules that are not fully LTOed

From: Andi Kleen <>

When __gnu_lto_* is present that means that the module hasn't run with
LTO yet.

Signed-off-by: Andi Kleen <>
 kernel/module.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/module.c b/kernel/module.c
index b99e801..4f3eff7 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1949,8 +1949,11 @@ static int simplify_symbols(struct module *mod, const struct load_info *info)
 		switch (sym[i].st_shndx) {
 		case SHN_COMMON:
 			/* Ignore common symbols */
-			if (!strncmp(name, "__gnu_lto", 9))
+			if (!strncmp(name, "__gnu_lto", 9)) {
+				pr_info("%s: module not link time optimized\n",
+				       mod->name);
+			}
 			/* We compiled with -fno-common.  These are not
 			   supposed to happen.  */

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