linux-kernel - [PATCH 19/20] lto, module: Warn about modules that are not fully LTOed

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Message-Id: <1392733738-8290-20-git-send-email-andi@firstfloor.org>
Date:	Tue, 18 Feb 2014 15:28:57 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	linux-kernel@...r.kernel.org
Cc:	sam@...nborg.org, x86@...nel.org, linux-kbuild@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>, rusty@...tcorp.com.au
Subject: [PATCH 19/20] lto, module: Warn about modules that are not fully LTOed

From: Andi Kleen <ak@...ux.intel.com>

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

Cc: rusty@...tcorp.com.au
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 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);
 				break;
+			}
 
 			/* We compiled with -fno-common.  These are not
 			   supposed to happen.  */
-- 
1.8.5.2

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