[PATCH 73/74] lto, module: Warn about modules that are not fully LTOed

[Andi Kleen]

From: Andi Kleen <ak@xxxxxxxxxxxxxxx>

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

Cc: rusty@xxxxxxxxxxxxxxx
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
---
 kernel/module.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/kernel/module.c b/kernel/module.c
index 2cbbae3..a8a29c4 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1905,8 +1905,11 @@ 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)) {
+				printk("%s: module not link time optimized\n",
+				       mod->name);
 				break;
+			}
 
 			/* We compiled with -fno-common.  These are not
 			   supposed to happen.  */
-- 
1.7.7.6

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