[lkml]   [2014]   [Feb]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH 05/17] lto: Handle LTO common symbols in module loader
From: Joe Mario <>

Here is the workaround I made for having the kernel not reject modules
built with -flto. The clean solution would be to get the compiler to not
emit the symbol. Or if it has to emit the symbol, then emit it as
initialized data but put it into a comdat/linkonce section.

Minor tweaks by AK over Joe's patch.

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

diff --git a/kernel/module.c b/kernel/module.c
index d24fcf2..b99e801 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1948,6 +1948,10 @@ static int simplify_symbols(struct module *mod, const struct load_info *info)

switch (sym[i].st_shndx) {
+ /* Ignore common symbols */
+ if (!strncmp(name, "__gnu_lto", 9))
+ break;
/* We compiled with -fno-common. These are not
supposed to happen. */
pr_debug("Common symbol: %s\n", name);

 \ /
  Last update: 2014-02-08 10:01    [W:0.145 / U:1.112 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site