x86/lib: Drop the unused return value from wbinvd_on_all_cpus()

Drop wbinvd_on_all_cpus()'s return value; both the "real" version and the
stub always return '0', and none of the callers check the return.

Signed-off-by: Sean Christopherson <[email protected]>
Signed-off-by: Borislav Petkov (AMD) <[email protected]>
Link: https://lore.kernel.org/[email protected]

Author: sean-jc

arch/x86/include/asm/smp.h

@@ -112,7 +112,7 @@ void __noreturn hlt_play_dead(void);
 void native_play_dead(void);
 void play_dead_common(void);
 void wbinvd_on_cpu(int cpu);
-int wbinvd_on_all_cpus(void);
+void wbinvd_on_all_cpus(void);
 
 void smp_kick_mwait_play_dead(void);
 void __noreturn mwait_play_dead(unsigned int eax_hint);
@@ -148,10 +148,9 @@ static inline struct cpumask *cpu_l2c_shared_mask(int cpu)
 
 #else /* !CONFIG_SMP */
 #define wbinvd_on_cpu(cpu)     wbinvd()
-static inline int wbinvd_on_all_cpus(void)
+static inline void wbinvd_on_all_cpus(void)
 {
 	wbinvd();
-	return 0;
 }
 
 static inline struct cpumask *cpu_llc_shared_mask(int cpu)

arch/x86/lib/cache-smp.c

@@ -14,9 +14,8 @@ void wbinvd_on_cpu(int cpu)
 }
 EXPORT_SYMBOL(wbinvd_on_cpu);
 
-int wbinvd_on_all_cpus(void)
+void wbinvd_on_all_cpus(void)
 {
 	on_each_cpu(__wbinvd, NULL, 1);
-	return 0;
 }
 EXPORT_SYMBOL(wbinvd_on_all_cpus);