diff options
| -rw-r--r-- | arch/x86/include/asm/livepatch.h | 6 | ||||
| -rw-r--r-- | kernel/livepatch/core.c | 6 |
2 files changed, 11 insertions, 1 deletions
diff --git a/arch/x86/include/asm/livepatch.h b/arch/x86/include/asm/livepatch.h index b5608d7..26e5813 100644 --- a/arch/x86/include/asm/livepatch.h +++ b/arch/x86/include/asm/livepatch.h @@ -25,9 +25,13 @@ #include <linux/ftrace.h> #ifdef CONFIG_LIVE_PATCHING +static inline int klp_check_compiler_support(void) +{ #ifndef CC_USING_FENTRY -#error Your compiler must support -mfentry for live patching to work + return 1; #endif + return 0; +} extern int klp_write_module_reloc(struct module *mod, unsigned long type, unsigned long loc, unsigned long value); diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c index 6f63879..ce42d3b 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; |
