Otherwise those using it in transition patches (eg. kvm) can't compile
with CONFIG_SMP=n:
arch/x86/kvm/../../../virt/kvm/kvm_main.c: In function 'make_all_cpus_request':
arch/x86/kvm/../../../virt/kvm/kvm_main.c:380: error: implicit declaration of function 'smp_call_function_many'
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 })
 #define smp_call_function_mask(mask, func, info, wait) \
                        (up_smp_call_function(func, info))
+#define smp_call_function_many(mask, func, info, wait) \
+                       (up_smp_call_function(func, info))
 static inline void init_call_single_data(void)
 {
 }