[PATCH] x86-64: Remove obsolete APIC "write around" bug workaround

No x86-64 chipset has this bug

Generated code doesn't change because it was always disabled.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/x86_64/kernel/genapic_cluster.c

@@ -51,10 +51,10 @@ static void cluster_init_apic_ldr(void)
 		count = 3;
 	id = my_cluster | (1UL << count);
 	x86_cpu_to_log_apicid[smp_processor_id()] = id;
-	apic_write_around(APIC_DFR, APIC_DFR_CLUSTER);
+	apic_write(APIC_DFR, APIC_DFR_CLUSTER);
 	val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
 	val |= SET_APIC_LOGICAL_ID(id);
-	apic_write_around(APIC_LDR, val);
+	apic_write(APIC_LDR, val);
 }
 
 /* Start with all IRQs pointing to boot CPU.  IRQ balancing will shift them. */

arch/x86_64/kernel/genapic_flat.c

@@ -38,10 +38,10 @@ static void flat_init_apic_ldr(void)
 	num = smp_processor_id();
 	id = 1UL << num;
 	x86_cpu_to_log_apicid[num] = id;
-	apic_write_around(APIC_DFR, APIC_DFR_FLAT);
+	apic_write(APIC_DFR, APIC_DFR_FLAT);
 	val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
 	val |= SET_APIC_LOGICAL_ID(id);
-	apic_write_around(APIC_LDR, val);
+	apic_write(APIC_LDR, val);
 }
 
 static void flat_send_IPI_mask(cpumask_t cpumask, int vector)
@@ -62,7 +62,7 @@ static void flat_send_IPI_mask(cpumask_t cpumask, int vector)
 	 * prepare target chip field
 	 */
 	cfg = __prepare_ICR2(mask);
-	apic_write_around(APIC_ICR2, cfg);
+	apic_write(APIC_ICR2, cfg);
 
 	/*
 	 * program the ICR
@@ -72,7 +72,7 @@ static void flat_send_IPI_mask(cpumask_t cpumask, int vector)
 	/*
 	 * Send the IPI. The write to APIC_ICR fires this off.
 	 */
-	apic_write_around(APIC_ICR, cfg);
+	apic_write(APIC_ICR, cfg);
 	local_irq_restore(flags);
 }
 

include/asm-x86_64/ipi.h

@@ -66,7 +66,7 @@ static inline void __send_IPI_shortcut(unsigned int shortcut, int vector, unsign
 	/*
 	 * Send the IPI. The write to APIC_ICR fires this off.
 	 */
-	apic_write_around(APIC_ICR, cfg);
+	apic_write(APIC_ICR, cfg);
 }
 
 
@@ -92,7 +92,7 @@ static inline void send_IPI_mask_sequence(cpumask_t mask, int vector)
 		 * prepare target chip field
 		 */
 		cfg = __prepare_ICR2(x86_cpu_to_apicid[query_cpu]);
-		apic_write_around(APIC_ICR2, cfg);
+		apic_write(APIC_ICR2, cfg);
 
 		/*
 		 * program the ICR
@@ -102,7 +102,7 @@ static inline void send_IPI_mask_sequence(cpumask_t mask, int vector)
 		/*
 		 * Send the IPI. The write to APIC_ICR fires this off.
 		 */
-		apic_write_around(APIC_ICR, cfg);
+		apic_write(APIC_ICR, cfg);
 	}
 	local_irq_restore(flags);
 }