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authorJoe Mario <jmario@redhat.com>2014-02-08 03:01:09 -0500
committerH. Peter Anvin <hpa@linux.intel.com>2014-02-13 23:24:50 -0500
commit80375980f1608f43b47abc2671456b23ec68c434 (patch)
tree305be1bb13f3535fffed254d5af46402b5d275af /kernel/module.c
parentef1b893c29d0dba778f67ad97b554b37f9108dcc (diff)
lto: Handle LTO common symbols in module loader
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. Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/1391846481-31491-5-git-send-email-ak@linux.intel.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'kernel/module.c')
-rw-r--r--kernel/module.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/module.c b/kernel/module.c
index d24fcf29cb64..b99e80119eef 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)
1948 1948
1949 switch (sym[i].st_shndx) { 1949 switch (sym[i].st_shndx) {
1950 case SHN_COMMON: 1950 case SHN_COMMON:
1951 /* Ignore common symbols */
1952 if (!strncmp(name, "__gnu_lto", 9))
1953 break;
1954
1951 /* We compiled with -fno-common. These are not 1955 /* We compiled with -fno-common. These are not
1952 supposed to happen. */ 1956 supposed to happen. */
1953 pr_debug("Common symbol: %s\n", name); 1957 pr_debug("Common symbol: %s\n", name);