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livepatch: handle ancient compilers with more grace

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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 <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Acked-by: Josh Poimboeuf <[email protected]>
This commit is contained in:
Jiri Kosina committed 2015-01-09 10:55:10 +01:00
1 parent 83ac237a95
commit b9dfe0bed9
2 files changed
+11 -1
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kernel/livepatch/core.c
+6
View File
@@ -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;