path: root/kernel/livepatch/core.c
diff options
authorJiri Kosina <>2015-01-09 10:53:21 +0100
committerJiri Kosina <>2015-01-09 10:55:10 +0100
commitb9dfe0bed999d23ee8838d389637dd8aef83fafa (patch)
tree1e1761aa65759226ca26fe931b1b48de4cf65af9 /kernel/livepatch/core.c
parent83ac237a950e130c974d0170cce30891dcd8f250 (diff)
livepatch: handle ancient compilers with more grace
We are aborting a build in case when gcc doesn't support fentry on x86_64 (regs->ip modification can't really reliably work with mcount). This however breaks allmodconfig for people with older gccs that don't support -mfentry. Turn the build-time failure into runtime failure, resulting in the whole infrastructure not being initialized if CC_USING_FENTRY is unset. Reported-by: Andrew Morton <> Signed-off-by: Jiri Kosina <> Signed-off-by: Andrew Morton <> Acked-by: Josh Poimboeuf <>
Diffstat (limited to 'kernel/livepatch/core.c')
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index 6f6387912da7..ce42d3b930dc 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -911,6 +911,12 @@ static int klp_init(void)
int ret;
+ ret = klp_check_compiler_support();
+ if (ret) {
+ pr_info("Your compiler is too old; turning off.\n");
+ return -EINVAL;
+ }
ret = register_module_notifier(&klp_module_nb);
if (ret)
return ret;