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[18/19] lto, module: Warn about modules that are not fully LTOed

Message ID 1392412903-25733-19-git-send-email-andi@firstfloor.org (mailing list archive)
State New, archived
Headers show

Commit Message

Andi Kleen Feb. 14, 2014, 9:21 p.m. UTC 
From: Andi Kleen <ak@linux.intel.com>

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

Cc: rusty@rustcorp.com.au
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 kernel/module.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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Patch

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.  */