x86/split_lock: only trigger #AC panic on supported devices

split_lock_detect is only available when CONFIG_CPU_SUP_INTEL is
enabled. This fix a cross compile error.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Lili Li <lili.li@intel.com>

arch/x86/include/asm/traps.h

@@ -173,6 +173,8 @@ enum x86_pf_error_code {
 	X86_PF_PK	=		1 << 5,
 };
 
+#ifdef CONFIG_CPU_SUP_INTEL
 extern bool split_lock_detect_enabled;
+#endif
 
 #endif /* _ASM_X86_TRAPS_H */

arch/x86/kernel/traps.c

@@ -306,8 +306,10 @@ dotraplinkage void do_alignment_check(struct pt_regs *regs, long error_code)
 	if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) == NOTIFY_STOP)
 		return;
 
+#ifdef CONFIG_CPU_SUP_INTEL
 	if (!user_mode(regs) && split_lock_detect_enabled)
 		panic("Split lock detected\n");
+#endif
 
 	cond_local_irq_enable(regs);