x86, apic: untangle the send_IPI_*() jungle

Our send_IPI_*() methods and definitions are a twisted mess: the same
symbol is defined to different things depending on .config details,
in a non-transparent way.

 - spread out the quirks into separately named per apic driver methods

 - prefix the standard PC methods with default_

 - get rid of wrapper macro obfuscation

 - clean up various details
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/include/asm/bigsmp/ipi.h

 #ifndef __ASM_MACH_IPI_H
 #define __ASM_MACH_IPI_H
 
-void send_IPI_mask_sequence(const struct cpumask *mask, int vector);
-void send_IPI_mask_allbutself(const struct cpumask *mask, int vector);
+void default_send_IPI_mask_sequence(const struct cpumask *mask, int vector);
+void default_send_IPI_mask_allbutself(const struct cpumask *mask, int vector);
 
-static inline void send_IPI_mask(const struct cpumask *mask, int vector)
+static inline void default_send_IPI_mask(const struct cpumask *mask, int vector)
 {
-	send_IPI_mask_sequence(mask, vector);
+	default_send_IPI_mask_sequence(mask, vector);
 }
 
-static inline void send_IPI_allbutself(int vector)
+static inline void bigsmp_send_IPI_allbutself(int vector)
 {
-	send_IPI_mask_allbutself(cpu_online_mask, vector);
+	default_send_IPI_mask_allbutself(cpu_online_mask, vector);
 }
 
-static inline void send_IPI_all(int vector)
+static inline void bigsmp_send_IPI_all(int vector)
 {
-	send_IPI_mask(cpu_online_mask, vector);
+	default_send_IPI_mask(cpu_online_mask, vector);
 }
 
 #endif /* __ASM_MACH_IPI_H */

arch/x86/include/asm/es7000/ipi.h

 #ifndef __ASM_ES7000_IPI_H
 #define __ASM_ES7000_IPI_H
 
-void send_IPI_mask_sequence(const struct cpumask *mask, int vector);
-void send_IPI_mask_allbutself(const struct cpumask *mask, int vector);
+void default_send_IPI_mask_sequence(const struct cpumask *mask, int vector);
+void default_send_IPI_mask_allbutself(const struct cpumask *mask, int vector);
 
-static inline void send_IPI_mask(const struct cpumask *mask, int vector)
+static inline void es7000_send_IPI_mask(const struct cpumask *mask, int vector)
 {
-	send_IPI_mask_sequence(mask, vector);
+	default_send_IPI_mask_sequence(mask, vector);
 }
 
-static inline void send_IPI_allbutself(int vector)
+static inline void es7000_send_IPI_allbutself(int vector)
 {
-	send_IPI_mask_allbutself(cpu_online_mask, vector);
+	default_send_IPI_mask_allbutself(cpu_online_mask, vector);
 }
 
-static inline void send_IPI_all(int vector)
+static inline void es7000_send_IPI_all(int vector)
 {
-	send_IPI_mask(cpu_online_mask, vector);
+	es7000_send_IPI_mask(cpu_online_mask, vector);
 }
 
 #endif /* __ASM_ES7000_IPI_H */

arch/x86/include/asm/hw_irq.h

@@ -73,9 +73,9 @@ extern void enable_IO_APIC(void);
 
 /* IPI functions */
 #ifdef CONFIG_X86_32
-extern void send_IPI_self(int vector);
+extern void default_send_IPI_self(int vector);
 #endif
-extern void send_IPI(int dest, int vector);
+extern void default_send_IPI(int dest, int vector);
 
 /* Statistics */
 extern atomic_t irq_err_count;

arch/x86/include/asm/ipi.h

@@ -55,8 +55,9 @@ static inline void __xapic_wait_icr_idle(void)
 		cpu_relax();
 }
 
-static inline void __send_IPI_shortcut(unsigned int shortcut, int vector,
-				       unsigned int dest)
+static inline void
+__default_send_IPI_shortcut(unsigned int shortcut,
+			    int vector, unsigned int dest)
 {
 	/*
 	 * Subtle. In the case of the 'never do double writes' workaround
@@ -87,8 +88,8 @@ static inline void __send_IPI_shortcut(unsigned int shortcut, int vector,
  * This is used to send an IPI with no shorthand notation (the destination is
  * specified in bits 56 to 63 of the ICR).
  */
-static inline void __send_IPI_dest_field(unsigned int mask, int vector,
-					 unsigned int dest)
+static inline void
+ __default_send_IPI_dest_field(unsigned int mask, int vector, unsigned int dest)
 {
 	unsigned long cfg;
 
@@ -117,11 +118,11 @@ static inline void __send_IPI_dest_field(unsigned int mask, int vector,
 	native_apic_mem_write(APIC_ICR, cfg);
 }
 
-static inline void send_IPI_mask_sequence(const struct cpumask *mask,
-					  int vector)
+static inline void
+default_send_IPI_mask_sequence(const struct cpumask *mask, int vector)
 {
-	unsigned long flags;
 	unsigned long query_cpu;
+	unsigned long flags;
 
 	/*
 	 * Hack. The clustered APIC addressing mode doesn't allow us to send
@@ -130,27 +131,28 @@ static inline void send_IPI_mask_sequence(const struct cpumask *mask,
 	 */
 	local_irq_save(flags);
 	for_each_cpu(query_cpu, mask) {
-		__send_IPI_dest_field(per_cpu(x86_cpu_to_apicid, query_cpu),
-				      vector, APIC_DEST_PHYSICAL);
+		__default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
+				query_cpu), vector, APIC_DEST_PHYSICAL);
 	}
 	local_irq_restore(flags);
 }
 
-static inline void send_IPI_mask_allbutself(const struct cpumask *mask,
-					    int vector)
+static inline void
+default_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
 {
-	unsigned long flags;
-	unsigned int query_cpu;
 	unsigned int this_cpu = smp_processor_id();
+	unsigned int query_cpu;
+	unsigned long flags;
 
 	/* See Hack comment above */
 
 	local_irq_save(flags);
-	for_each_cpu(query_cpu, mask)
-		if (query_cpu != this_cpu)
-			__send_IPI_dest_field(
-				per_cpu(x86_cpu_to_apicid, query_cpu),
-				vector, APIC_DEST_PHYSICAL);
+	for_each_cpu(query_cpu, mask) {
+		if (query_cpu == this_cpu)
+			continue;
+		__default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
+				 query_cpu), vector, APIC_DEST_PHYSICAL);
+	}
 	local_irq_restore(flags);
 }
 

arch/x86/include/asm/mach-default/mach_apic.h

@@ -20,7 +20,6 @@ static inline const struct cpumask *default_target_cpus(void)
 #ifdef CONFIG_X86_64
 #include <asm/genapic.h>
 #define read_apic_id()  (apic->get_apic_id(apic_read(APIC_ID)))
-#define send_IPI_self (apic->send_IPI_self)
 #define wakeup_secondary_cpu (apic->wakeup_cpu)
 extern void default_setup_apic_routing(void);
 #else

arch/x86/include/asm/mach-default/mach_ipi.h

@@ -4,45 +4,40 @@
 /* Avoid include hell */
 #define NMI_VECTOR 0x02
 
-void send_IPI_mask_bitmask(const struct cpumask *mask, int vector);
-void send_IPI_mask_allbutself(const struct cpumask *mask, int vector);
-void __send_IPI_shortcut(unsigned int shortcut, int vector);
+void default_send_IPI_mask_bitmask(const struct cpumask *mask, int vector);
+void default_send_IPI_mask_allbutself(const struct cpumask *mask, int vector);
+void __default_send_IPI_shortcut(unsigned int shortcut, int vector);
 
 extern int no_broadcast;
 
 #ifdef CONFIG_X86_64
 #include <asm/genapic.h>
-#define send_IPI_mask (apic->send_IPI_mask)
-#define send_IPI_mask_allbutself (apic->send_IPI_mask_allbutself)
 #else
-static inline void send_IPI_mask(const struct cpumask *mask, int vector)
+static inline void default_send_IPI_mask(const struct cpumask *mask, int vector)
 {
-	send_IPI_mask_bitmask(mask, vector);
+	default_send_IPI_mask_bitmask(mask, vector);
 }
-void send_IPI_mask_allbutself(const struct cpumask *mask, int vector);
+void default_send_IPI_mask_allbutself(const struct cpumask *mask, int vector);
 #endif
 
-static inline void __local_send_IPI_allbutself(int vector)
+static inline void __default_local_send_IPI_allbutself(int vector)
 {
 	if (no_broadcast || vector == NMI_VECTOR)
-		send_IPI_mask_allbutself(cpu_online_mask, vector);
+		apic->send_IPI_mask_allbutself(cpu_online_mask, vector);
 	else
-		__send_IPI_shortcut(APIC_DEST_ALLBUT, vector);
+		__default_send_IPI_shortcut(APIC_DEST_ALLBUT, vector);
 }
 
-static inline void __local_send_IPI_all(int vector)
+static inline void __default_local_send_IPI_all(int vector)
 {
 	if (no_broadcast || vector == NMI_VECTOR)
-		send_IPI_mask(cpu_online_mask, vector);
+		apic->send_IPI_mask(cpu_online_mask, vector);
 	else
-		__send_IPI_shortcut(APIC_DEST_ALLINC, vector);
+		__default_send_IPI_shortcut(APIC_DEST_ALLINC, vector);
 }
 
-#ifdef CONFIG_X86_64
-#define send_IPI_allbutself (apic->send_IPI_allbutself)
-#define send_IPI_all (apic->send_IPI_all)
-#else
-static inline void send_IPI_allbutself(int vector)
+#ifdef CONFIG_X86_32
+static inline void default_send_IPI_allbutself(int vector)
 {
 	/*
 	 * if there are no other CPUs in the system then we get an APIC send 
@@ -51,13 +46,12 @@ static inline void send_IPI_allbutself(int vector)
 	if (!(num_online_cpus() > 1))
 		return;
 
-	__local_send_IPI_allbutself(vector);
-	return;
+	__default_local_send_IPI_allbutself(vector);
 }
 
-static inline void send_IPI_all(int vector)
+static inline void default_send_IPI_all(int vector)
 {
-	__local_send_IPI_all(vector);
+	__default_local_send_IPI_all(vector);
 }
 #endif
 

arch/x86/include/asm/mach-generic/mach_ipi.h

@@ -3,8 +3,4 @@
 
 #include <asm/genapic.h>
 
-#define send_IPI_mask (apic->send_IPI_mask)
-#define send_IPI_allbutself (apic->send_IPI_allbutself)
-#define send_IPI_all (apic->send_IPI_all)
-
 #endif /* _ASM_X86_MACH_GENERIC_MACH_IPI_H */

arch/x86/include/asm/numaq/ipi.h

 #ifndef __ASM_NUMAQ_IPI_H
 #define __ASM_NUMAQ_IPI_H
 
-void send_IPI_mask_sequence(const struct cpumask *mask, int vector);
-void send_IPI_mask_allbutself(const struct cpumask *mask, int vector);
+void default_send_IPI_mask_sequence(const struct cpumask *mask, int vector);
+void default_send_IPI_mask_allbutself(const struct cpumask *mask, int vector);
 
-static inline void send_IPI_mask(const struct cpumask *mask, int vector)
+static inline void numaq_send_IPI_mask(const struct cpumask *mask, int vector)
 {
-	send_IPI_mask_sequence(mask, vector);
+	default_send_IPI_mask_sequence(mask, vector);
 }
 
-static inline void send_IPI_allbutself(int vector)
+static inline void numaq_send_IPI_allbutself(int vector)
 {
-	send_IPI_mask_allbutself(cpu_online_mask, vector);
+	default_send_IPI_mask_allbutself(cpu_online_mask, vector);
 }
 
-static inline void send_IPI_all(int vector)
+static inline void numaq_send_IPI_all(int vector)
 {
-	send_IPI_mask(cpu_online_mask, vector);
+	numaq_send_IPI_mask(cpu_online_mask, vector);
 }
 
 #endif /* __ASM_NUMAQ_IPI_H */

arch/x86/include/asm/summit/ipi.h

 #ifndef __ASM_SUMMIT_IPI_H
 #define __ASM_SUMMIT_IPI_H
 
-void send_IPI_mask_sequence(const cpumask_t *mask, int vector);
-void send_IPI_mask_allbutself(const cpumask_t *mask, int vector);
+void default_send_IPI_mask_sequence(const cpumask_t *mask, int vector);
+void default_send_IPI_mask_allbutself(const cpumask_t *mask, int vector);
 
-static inline void send_IPI_mask(const cpumask_t *mask, int vector)
+static inline void summit_send_IPI_mask(const cpumask_t *mask, int vector)
 {
-	send_IPI_mask_sequence(mask, vector);
+	default_send_IPI_mask_sequence(mask, vector);
 }
 
-static inline void send_IPI_allbutself(int vector)
+static inline void summit_send_IPI_allbutself(int vector)
 {
 	cpumask_t mask = cpu_online_map;
 	cpu_clear(smp_processor_id(), mask);
 
 	if (!cpus_empty(mask))
-		send_IPI_mask(&mask, vector);
+		summit_send_IPI_mask(&mask, vector);
 }
 
-static inline void send_IPI_all(int vector)
+static inline void summit_send_IPI_all(int vector)
 {
-	send_IPI_mask(&cpu_online_map, vector);
+	summit_send_IPI_mask(&cpu_online_map, vector);
 }
 
 #endif /* __ASM_SUMMIT_IPI_H */

arch/x86/kernel/apic.c

@@ -475,7 +475,7 @@ static void lapic_timer_setup(enum clock_event_mode mode,
 static void lapic_timer_broadcast(const struct cpumask *mask)
 {
 #ifdef CONFIG_SMP
-	send_IPI_mask(mask, LOCAL_TIMER_VECTOR);
+	apic->send_IPI_mask(mask, LOCAL_TIMER_VECTOR);
 #endif
 }
 

arch/x86/kernel/genapic_64.c

@@ -65,7 +65,7 @@ void __init default_setup_apic_routing(void)
 
 void apic_send_IPI_self(int vector)
 {
-	__send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
+	__default_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
 }
 
 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)

arch/x86/kernel/genapic_flat_64.c

@@ -74,7 +74,7 @@ static inline void _flat_send_IPI_mask(unsigned long mask, int vector)
 	unsigned long flags;
 
 	local_irq_save(flags);
-	__send_IPI_dest_field(mask, vector, apic->dest_logical);
+	__default_send_IPI_dest_field(mask, vector, apic->dest_logical);
 	local_irq_restore(flags);
 }
 
@@ -85,14 +85,15 @@ static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
 	_flat_send_IPI_mask(mask, vector);
 }
 
-static void flat_send_IPI_mask_allbutself(const struct cpumask *cpumask,
-					  int vector)
+static void
+ flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
 {
 	unsigned long mask = cpumask_bits(cpumask)[0];
 	int cpu = smp_processor_id();
 
 	if (cpu < BITS_PER_LONG)
 		clear_bit(cpu, &mask);
+
 	_flat_send_IPI_mask(mask, vector);
 }
 
@@ -114,16 +115,19 @@ static void flat_send_IPI_allbutself(int vector)
 			_flat_send_IPI_mask(mask, vector);
 		}
 	} else if (num_online_cpus() > 1) {
-		__send_IPI_shortcut(APIC_DEST_ALLBUT, vector, apic->dest_logical);
+		__default_send_IPI_shortcut(APIC_DEST_ALLBUT,
+					    vector, apic->dest_logical);
 	}
 }
 
 static void flat_send_IPI_all(int vector)
 {
-	if (vector == NMI_VECTOR)
+	if (vector == NMI_VECTOR) {
 		flat_send_IPI_mask(cpu_online_mask, vector);
-	else
-		__send_IPI_shortcut(APIC_DEST_ALLINC, vector, apic->dest_logical);
+	} else {
+		__default_send_IPI_shortcut(APIC_DEST_ALLINC,
+					    vector, apic->dest_logical);
+	}
 }
 
 static unsigned int flat_get_apic_id(unsigned long x)
@@ -265,18 +269,18 @@ static void physflat_vector_allocation_domain(int cpu, struct cpumask *retmask)
 
 static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector)
 {
-	send_IPI_mask_sequence(cpumask, vector);
+	default_send_IPI_mask_sequence(cpumask, vector);
 }
 
 static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask,
 					      int vector)
 {
-	send_IPI_mask_allbutself(cpumask, vector);
+	default_send_IPI_mask_allbutself(cpumask, vector);
 }
 
 static void physflat_send_IPI_allbutself(int vector)
 {
-	send_IPI_mask_allbutself(cpu_online_mask, vector);
+	default_send_IPI_mask_allbutself(cpu_online_mask, vector);
 }
 
 static void physflat_send_IPI_all(int vector)

arch/x86/kernel/genx2apic_cluster.c

@@ -36,8 +36,8 @@ static void x2apic_vector_allocation_domain(int cpu, struct cpumask *retmask)
 	cpumask_set_cpu(cpu, retmask);
 }
 
-static void __x2apic_send_IPI_dest(unsigned int apicid, int vector,
-				   unsigned int dest)
+static void
+ __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest)
 {
 	unsigned long cfg;
 
@@ -57,45 +57,50 @@ static void __x2apic_send_IPI_dest(unsigned int apicid, int vector,
  */
 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
 {
-	unsigned long flags;
 	unsigned long query_cpu;
+	unsigned long flags;
 
 	local_irq_save(flags);
-	for_each_cpu(query_cpu, mask)
+	for_each_cpu(query_cpu, mask) {
 		__x2apic_send_IPI_dest(
 			per_cpu(x86_cpu_to_logical_apicid, query_cpu),
 			vector, apic->dest_logical);
+	}
 	local_irq_restore(flags);
 }
 
-static void x2apic_send_IPI_mask_allbutself(const struct cpumask *mask,
-					    int vector)
+static void
+ x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
 {
-	unsigned long flags;
-	unsigned long query_cpu;
 	unsigned long this_cpu = smp_processor_id();
+	unsigned long query_cpu;
+	unsigned long flags;
 
 	local_irq_save(flags);
-	for_each_cpu(query_cpu, mask)
-		if (query_cpu != this_cpu)
-			__x2apic_send_IPI_dest(
+	for_each_cpu(query_cpu, mask) {
+		if (query_cpu == this_cpu)
+			continue;
+		__x2apic_send_IPI_dest(
 				per_cpu(x86_cpu_to_logical_apicid, query_cpu),
 				vector, apic->dest_logical);
+	}
 	local_irq_restore(flags);
 }
 
 static void x2apic_send_IPI_allbutself(int vector)
 {
-	unsigned long flags;
-	unsigned long query_cpu;
 	unsigned long this_cpu = smp_processor_id();
+	unsigned long query_cpu;
+	unsigned long flags;
 
 	local_irq_save(flags);
-	for_each_online_cpu(query_cpu)
-		if (query_cpu != this_cpu)
-			__x2apic_send_IPI_dest(
+	for_each_online_cpu(query_cpu) {
+		if (query_cpu == this_cpu)
+			continue;
+		__x2apic_send_IPI_dest(
 				per_cpu(x86_cpu_to_logical_apicid, query_cpu),
 				vector, apic->dest_logical);
+	}
 	local_irq_restore(flags);
 }
 
@@ -175,7 +180,6 @@ static void init_x2apic_ldr(void)
 	int cpu = smp_processor_id();
 
 	per_cpu(x86_cpu_to_logical_apicid, cpu) = apic_read(APIC_LDR);
-	return;
 }
 
 struct genapic apic_x2apic_cluster = {

arch/x86/kernel/genx2apic_phys.c

@@ -55,8 +55,8 @@ static void __x2apic_send_IPI_dest(unsigned int apicid, int vector,
 
 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
 {
-	unsigned long flags;
 	unsigned long query_cpu;
+	unsigned long flags;
 
 	local_irq_save(flags);
 	for_each_cpu(query_cpu, mask) {
@@ -66,12 +66,12 @@ static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
 	local_irq_restore(flags);
 }
 
-static void x2apic_send_IPI_mask_allbutself(const struct cpumask *mask,
-					    int vector)
+static void
+ x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
 {
-	unsigned long flags;
-	unsigned long query_cpu;
 	unsigned long this_cpu = smp_processor_id();
+	unsigned long query_cpu;
+	unsigned long flags;
 
 	local_irq_save(flags);
 	for_each_cpu(query_cpu, mask) {
@@ -85,16 +85,17 @@ static void x2apic_send_IPI_mask_allbutself(const struct cpumask *mask,
 
 static void x2apic_send_IPI_allbutself(int vector)
 {
-	unsigned long flags;
-	unsigned long query_cpu;
 	unsigned long this_cpu = smp_processor_id();
+	unsigned long query_cpu;
+	unsigned long flags;
 
 	local_irq_save(flags);
-	for_each_online_cpu(query_cpu)
-		if (query_cpu != this_cpu)
-			__x2apic_send_IPI_dest(
-				per_cpu(x86_cpu_to_apicid, query_cpu),
-				vector, APIC_DEST_PHYSICAL);
+	for_each_online_cpu(query_cpu) {
+		if (query_cpu == this_cpu)
+			continue;
+		__x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
+				       vector, APIC_DEST_PHYSICAL);
+	}
 	local_irq_restore(flags);
 }
 
@@ -145,18 +146,12 @@ x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 
 static unsigned int x2apic_phys_get_apic_id(unsigned long x)
 {
-	unsigned int id;
-
-	id = x;
-	return id;
+	return x;
 }
 
 static unsigned long set_apic_id(unsigned int id)
 {
-	unsigned long x;
-
-	x = id;
-	return x;
+	return id;
 }
 
 static int x2apic_phys_pkg_id(int initial_apicid, int index_msb)
@@ -171,7 +166,6 @@ static void x2apic_send_IPI_self(int vector)
 
 static void init_x2apic_ldr(void)
 {
-	return;
 }
 
 struct genapic apic_x2apic_phys = {

arch/x86/kernel/genx2apic_uv_x.c

@@ -118,12 +118,13 @@ static void uv_send_IPI_one(int cpu, int vector)
 	int pnode;
 
 	apicid = per_cpu(x86_cpu_to_apicid, cpu);
-	lapicid = apicid & 0x3f;		/* ZZZ macro needed */
+	lapicid = apicid & 0x3f; /* ZZZ macro needed */
 	pnode = uv_apicid_to_pnode(apicid);
-	val =
-	    (1UL << UVH_IPI_INT_SEND_SHFT) | (lapicid <<
-					      UVH_IPI_INT_APIC_ID_SHFT) |
-	    (vector << UVH_IPI_INT_VECTOR_SHFT);
+
+	val = (     1UL << UVH_IPI_INT_SEND_SHFT    ) |
+	      ( lapicid << UVH_IPI_INT_APIC_ID_SHFT ) |
+	      (  vector << UVH_IPI_INT_VECTOR_SHFT  );
+
 	uv_write_global_mmr64(pnode, UVH_IPI_INT, val);
 }
 
@@ -137,22 +138,24 @@ static void uv_send_IPI_mask(const struct cpumask *mask, int vector)
 
 static void uv_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
 {
-	unsigned int cpu;
 	unsigned int this_cpu = smp_processor_id();
+	unsigned int cpu;
 
-	for_each_cpu(cpu, mask)
+	for_each_cpu(cpu, mask) {
 		if (cpu != this_cpu)
 			uv_send_IPI_one(cpu, vector);
+	}
 }
 
 static void uv_send_IPI_allbutself(int vector)
 {
-	unsigned int cpu;
 	unsigned int this_cpu = smp_processor_id();
+	unsigned int cpu;
 
-	for_each_online_cpu(cpu)
+	for_each_online_cpu(cpu) {
 		if (cpu != this_cpu)
 			uv_send_IPI_one(cpu, vector);
+	}
 }
 
 static void uv_send_IPI_all(int vector)

arch/x86/kernel/io_apic.c

@@ -514,11 +514,11 @@ static void send_cleanup_vector(struct irq_cfg *cfg)
 		for_each_cpu_and(i, cfg->old_domain, cpu_online_mask)
 			cfg->move_cleanup_count++;
 		for_each_cpu_and(i, cfg->old_domain, cpu_online_mask)
-			send_IPI_mask(cpumask_of(i), IRQ_MOVE_CLEANUP_VECTOR);
+			apic->send_IPI_mask(cpumask_of(i), IRQ_MOVE_CLEANUP_VECTOR);
 	} else {
 		cpumask_and(cleanup_mask, cfg->old_domain, cpu_online_mask);
 		cfg->move_cleanup_count = cpumask_weight(cleanup_mask);
-		send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
+		apic->send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
 		free_cpumask_var(cleanup_mask);
 	}
 	cfg->move_in_progress = 0;
@@ -800,7 +800,7 @@ static void clear_IO_APIC (void)
 }
 
 #if !defined(CONFIG_SMP) && defined(CONFIG_X86_32)
-void send_IPI_self(int vector)
+void default_send_IPI_self(int vector)
 {
 	unsigned int cfg;
 
@@ -2297,7 +2297,7 @@ static int ioapic_retrigger_irq(unsigned int irq)
 	unsigned long flags;
 
 	spin_lock_irqsave(&vector_lock, flags);
-	send_IPI_mask(cpumask_of(cpumask_first(cfg->domain)), cfg->vector);
+	apic->send_IPI_mask(cpumask_of(cpumask_first(cfg->domain)), cfg->vector);
 	spin_unlock_irqrestore(&vector_lock, flags);
 
 	return 1;
@@ -2305,7 +2305,7 @@ static int ioapic_retrigger_irq(unsigned int irq)
 #else
 static int ioapic_retrigger_irq(unsigned int irq)
 {
-	send_IPI_self(irq_cfg(irq)->vector);
+	apic->send_IPI_self(irq_cfg(irq)->vector);
 
 	return 1;
 }

arch/x86/kernel/ipi.c

@@ -48,7 +48,7 @@ static inline int __prepare_ICR2(unsigned int mask)
 	return SET_APIC_DEST_FIELD(mask);
 }
 
-void __send_IPI_shortcut(unsigned int shortcut, int vector)
+void __default_send_IPI_shortcut(unsigned int shortcut, int vector)
 {
 	/*
 	 * Subtle. In the case of the 'never do double writes' workaround
@@ -75,16 +75,16 @@ void __send_IPI_shortcut(unsigned int shortcut, int vector)
 	apic_write(APIC_ICR, cfg);
 }
 
-void send_IPI_self(int vector)
+void default_send_IPI_self(int vector)
 {
-	__send_IPI_shortcut(APIC_DEST_SELF, vector);
+	__default_send_IPI_shortcut(APIC_DEST_SELF, vector);
 }
 
 /*
  * This is used to send an IPI with no shorthand notation (the destination is
  * specified in bits 56 to 63 of the ICR).
  */
-static inline void __send_IPI_dest_field(unsigned long mask, int vector)
+static inline void __default_send_IPI_dest_field(unsigned long mask, int vector)
 {
 	unsigned long cfg;
 
@@ -116,18 +116,18 @@ static inline void __send_IPI_dest_field(unsigned long mask, int vector)
 /*
  * This is only used on smaller machines.
  */
-void send_IPI_mask_bitmask(const struct cpumask *cpumask, int vector)
+void default_send_IPI_mask_bitmask(const struct cpumask *cpumask, int vector)
 {
 	unsigned long mask = cpumask_bits(cpumask)[0];
 	unsigned long flags;
 
 	local_irq_save(flags);
 	WARN_ON(mask & ~cpumask_bits(cpu_online_mask)[0]);
-	__send_IPI_dest_field(mask, vector);
+	__default_send_IPI_dest_field(mask, vector);
 	local_irq_restore(flags);
 }
 
-void send_IPI_mask_sequence(const struct cpumask *mask, int vector)
+void default_send_IPI_mask_sequence(const struct cpumask *mask, int vector)
 {
 	unsigned long flags;
 	unsigned int query_cpu;
@@ -140,11 +140,11 @@ void send_IPI_mask_sequence(const struct cpumask *mask, int vector)
 
 	local_irq_save(flags);
 	for_each_cpu(query_cpu, mask)
-		__send_IPI_dest_field(apic->cpu_to_logical_apicid(query_cpu), vector);
+		__default_send_IPI_dest_field(apic->cpu_to_logical_apicid(query_cpu), vector);
 	local_irq_restore(flags);
 }
 
-void send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
+void default_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
 {
 	unsigned long flags;
 	unsigned int query_cpu;
@@ -153,10 +153,12 @@ void send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
 	/* See Hack comment above */
 
 	local_irq_save(flags);
-	for_each_cpu(query_cpu, mask)
-		if (query_cpu != this_cpu)
-			__send_IPI_dest_field(apic->cpu_to_logical_apicid(query_cpu),
-					      vector);
+	for_each_cpu(query_cpu, mask) {
+		if (query_cpu == this_cpu)
+			continue;
+		__default_send_IPI_dest_field(
+			apic->cpu_to_logical_apicid(query_cpu), vector);
+	}
 	local_irq_restore(flags);
 }
 

arch/x86/kernel/kgdb.c

@@ -347,7 +347,7 @@ void kgdb_post_primary_code(struct pt_regs *regs, int e_vector, int err_code)
  */
 void kgdb_roundup_cpus(unsigned long flags)
 {
-	send_IPI_allbutself(APIC_DM_NMI);
+	apic->send_IPI_allbutself(APIC_DM_NMI);
 }
 #endif
 

arch/x86/kernel/reboot.c

@@ -651,7 +651,7 @@ static int crash_nmi_callback(struct notifier_block *self,
 
 static void smp_send_nmi_allbutself(void)
 {
-	send_IPI_allbutself(NMI_VECTOR);
+	apic->send_IPI_allbutself(NMI_VECTOR);
 }
 
 static struct notifier_block crash_nmi_nb = {

arch/x86/kernel/smp.c

@@ -118,12 +118,12 @@ static void native_smp_send_reschedule(int cpu)
 		WARN_ON(1);
 		return;
 	}
-	send_IPI_mask(cpumask_of(cpu), RESCHEDULE_VECTOR);
+	apic->send_IPI_mask(cpumask_of(cpu), RESCHEDULE_VECTOR);
 }
 
 void native_send_call_func_single_ipi(int cpu)
 {
-	send_IPI_mask(cpumask_of(cpu), CALL_FUNCTION_SINGLE_VECTOR);
+	apic->send_IPI_mask(cpumask_of(cpu), CALL_FUNCTION_SINGLE_VECTOR);
 }
 
 void native_send_call_func_ipi(const struct cpumask *mask)
@@ -131,7 +131,7 @@ void native_send_call_func_ipi(const struct cpumask *mask)
 	cpumask_var_t allbutself;
 
 	if (!alloc_cpumask_var(&allbutself, GFP_ATOMIC)) {
-		send_IPI_mask(mask, CALL_FUNCTION_VECTOR);
+		apic->send_IPI_mask(mask, CALL_FUNCTION_VECTOR);
 		return;
 	}
 
@@ -140,9 +140,9 @@ void native_send_call_func_ipi(const struct cpumask *mask)
 
 	if (cpumask_equal(mask, allbutself) &&
 	    cpumask_equal(cpu_online_mask, cpu_callout_mask))
-		send_IPI_allbutself(CALL_FUNCTION_VECTOR);
+		apic->send_IPI_allbutself(CALL_FUNCTION_VECTOR);
 	else
-		send_IPI_mask(mask, CALL_FUNCTION_VECTOR);
+		apic->send_IPI_mask(mask, CALL_FUNCTION_VECTOR);
 
 	free_cpumask_var(allbutself);
 }

arch/x86/mach-generic/bigsmp.c

@@ -97,10 +97,10 @@ struct genapic apic_bigsmp = {
 	.cpu_mask_to_apicid		= bigsmp_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= bigsmp_cpu_mask_to_apicid_and,
 
-	.send_IPI_mask			= send_IPI_mask,
+	.send_IPI_mask			= default_send_IPI_mask,
 	.send_IPI_mask_allbutself	= NULL,
-	.send_IPI_allbutself		= send_IPI_allbutself,
-	.send_IPI_all			= send_IPI_all,
+	.send_IPI_allbutself		= bigsmp_send_IPI_allbutself,
+	.send_IPI_all			= bigsmp_send_IPI_all,
 	.send_IPI_self			= NULL,
 
 	.wakeup_cpu			= NULL,

arch/x86/mach-generic/default.c

@@ -78,10 +78,10 @@ struct genapic apic_default = {
 	.cpu_mask_to_apicid		= default_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= default_cpu_mask_to_apicid_and,
 
-	.send_IPI_mask			= send_IPI_mask,
+	.send_IPI_mask			= default_send_IPI_mask,
 	.send_IPI_mask_allbutself	= NULL,
-	.send_IPI_allbutself		= send_IPI_allbutself,
-	.send_IPI_all			= send_IPI_all,
+	.send_IPI_allbutself		= default_send_IPI_allbutself,
+	.send_IPI_all			= default_send_IPI_all,
 	.send_IPI_self			= NULL,
 
 	.wakeup_cpu			= NULL,

arch/x86/mach-generic/es7000.c

@@ -133,10 +133,10 @@ struct genapic apic_es7000 = {
 	.cpu_mask_to_apicid		= es7000_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= es7000_cpu_mask_to_apicid_and,
 
-	.send_IPI_mask			= send_IPI_mask,
+	.send_IPI_mask			= es7000_send_IPI_mask,
 	.send_IPI_mask_allbutself	= NULL,
-	.send_IPI_allbutself		= send_IPI_allbutself,
-	.send_IPI_all			= send_IPI_all,
+	.send_IPI_allbutself		= es7000_send_IPI_allbutself,
+	.send_IPI_all			= es7000_send_IPI_all,
 	.send_IPI_self			= NULL,
 
 	.wakeup_cpu			= NULL,

arch/x86/mach-generic/numaq.c

@@ -97,10 +97,10 @@ struct genapic apic_numaq = {
 	.cpu_mask_to_apicid		= numaq_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= numaq_cpu_mask_to_apicid_and,
 
-	.send_IPI_mask			= send_IPI_mask,
+	.send_IPI_mask			= numaq_send_IPI_mask,
 	.send_IPI_mask_allbutself	= NULL,
-	.send_IPI_allbutself		= send_IPI_allbutself,
-	.send_IPI_all			= send_IPI_all,
+	.send_IPI_allbutself		= numaq_send_IPI_allbutself,
+	.send_IPI_all			= numaq_send_IPI_all,
 	.send_IPI_self			= NULL,
 
 	.wakeup_cpu			= NULL,

arch/x86/mach-generic/summit.c

@@ -77,10 +77,10 @@ struct genapic apic_summit = {
 	.cpu_mask_to_apicid		= summit_cpu_mask_to_apicid,
 	.cpu_mask_to_apicid_and		= summit_cpu_mask_to_apicid_and,
 
-	.send_IPI_mask			= send_IPI_mask,
+	.send_IPI_mask			= summit_send_IPI_mask,
 	.send_IPI_mask_allbutself	= NULL,
-	.send_IPI_allbutself		= send_IPI_allbutself,
-	.send_IPI_all			= send_IPI_all,
+	.send_IPI_allbutself		= summit_send_IPI_allbutself,
+	.send_IPI_all			= summit_send_IPI_all,
 	.send_IPI_self			= NULL,
 
 	.wakeup_cpu			= NULL,

arch/x86/mm/tlb.c

@@ -196,7 +196,7 @@ static void flush_tlb_others_ipi(const struct cpumask *cpumask,
 	 * We have to send the IPI only to
 	 * CPUs affected.
 	 */
-	send_IPI_mask(to_cpumask(f->flush_cpumask),
+	apic->send_IPI_mask(to_cpumask(f->flush_cpumask),
 		      INVALIDATE_TLB_VECTOR_START + sender);
 
 	while (!cpumask_empty(to_cpumask(f->flush_cpumask)))