xen: use this_cpu_xxx replace percpu_xxx funcs

percpu_xxx funcs are duplicated with this_cpu_xxx funcs, so replace them
for further code clean up.

I don't know much of xen code. But, since the code is in x86 architecture,
the percpu_xxx is exactly same as this_cpu_xxx serials functions. So, the
change is safe.
Signed-off-by: Alex Shi <alex.shi@intel.com>
Acked-by: Christoph Lameter <cl@gentwo.org>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

arch/x86/xen/enlighten.c

@@ -777,11 +777,11 @@ static DEFINE_PER_CPU(unsigned long, xen_cr0_value);
 
 static unsigned long xen_read_cr0(void)
 {
-	unsigned long cr0 = percpu_read(xen_cr0_value);
+	unsigned long cr0 = this_cpu_read(xen_cr0_value);
 
 	if (unlikely(cr0 == 0)) {
 		cr0 = native_read_cr0();
-		percpu_write(xen_cr0_value, cr0);
+		this_cpu_write(xen_cr0_value, cr0);
 	}
 
 	return cr0;
@@ -791,7 +791,7 @@ static void xen_write_cr0(unsigned long cr0)
 {
 	struct multicall_space mcs;
 
-	percpu_write(xen_cr0_value, cr0);
+	this_cpu_write(xen_cr0_value, cr0);
 
 	/* Only pay attention to cr0.TS; everything else is
 	   ignored. */

arch/x86/xen/irq.c

@@ -26,7 +26,7 @@ static unsigned long xen_save_fl(void)
 	struct vcpu_info *vcpu;
 	unsigned long flags;
 
-	vcpu = percpu_read(xen_vcpu);
+	vcpu = this_cpu_read(xen_vcpu);
 
 	/* flag has opposite sense of mask */
 	flags = !vcpu->evtchn_upcall_mask;
@@ -50,7 +50,7 @@ static void xen_restore_fl(unsigned long flags)
 	   make sure we're don't switch CPUs between getting the vcpu
 	   pointer and updating the mask. */
 	preempt_disable();
-	vcpu = percpu_read(xen_vcpu);
+	vcpu = this_cpu_read(xen_vcpu);
 	vcpu->evtchn_upcall_mask = flags;
 	preempt_enable_no_resched();
 
@@ -72,7 +72,7 @@ static void xen_irq_disable(void)
 	   make sure we're don't switch CPUs between getting the vcpu
 	   pointer and updating the mask. */
 	preempt_disable();
-	percpu_read(xen_vcpu)->evtchn_upcall_mask = 1;
+	this_cpu_read(xen_vcpu)->evtchn_upcall_mask = 1;
 	preempt_enable_no_resched();
 }
 PV_CALLEE_SAVE_REGS_THUNK(xen_irq_disable);
@@ -86,7 +86,7 @@ static void xen_irq_enable(void)
 	   the caller is confused and is trying to re-enable interrupts
 	   on an indeterminate processor. */
 
-	vcpu = percpu_read(xen_vcpu);
+	vcpu = this_cpu_read(xen_vcpu);
 	vcpu->evtchn_upcall_mask = 0;
 
 	/* Doesn't matter if we get preempted here, because any

arch/x86/xen/mmu.c

@@ -1071,14 +1071,14 @@ static void drop_other_mm_ref(void *info)
 	struct mm_struct *mm = info;
 	struct mm_struct *active_mm;
 
-	active_mm = percpu_read(cpu_tlbstate.active_mm);
+	active_mm = this_cpu_read(cpu_tlbstate.active_mm);
 
-	if (active_mm == mm && percpu_read(cpu_tlbstate.state) != TLBSTATE_OK)
+	if (active_mm == mm && this_cpu_read(cpu_tlbstate.state) != TLBSTATE_OK)
 		leave_mm(smp_processor_id());
 
 	/* If this cpu still has a stale cr3 reference, then make sure
 	   it has been flushed. */
-	if (percpu_read(xen_current_cr3) == __pa(mm->pgd))
+	if (this_cpu_read(xen_current_cr3) == __pa(mm->pgd))
 		load_cr3(swapper_pg_dir);
 }
 
@@ -1185,17 +1185,17 @@ static void __init xen_pagetable_setup_done(pgd_t *base)
 
 static void xen_write_cr2(unsigned long cr2)
 {
-	percpu_read(xen_vcpu)->arch.cr2 = cr2;
+	this_cpu_read(xen_vcpu)->arch.cr2 = cr2;
 }
 
 static unsigned long xen_read_cr2(void)
 {
-	return percpu_read(xen_vcpu)->arch.cr2;
+	return this_cpu_read(xen_vcpu)->arch.cr2;
 }
 
 unsigned long xen_read_cr2_direct(void)
 {
-	return percpu_read(xen_vcpu_info.arch.cr2);
+	return this_cpu_read(xen_vcpu_info.arch.cr2);
 }
 
 static void xen_flush_tlb(void)
@@ -1278,12 +1278,12 @@ static void xen_flush_tlb_others(const struct cpumask *cpus,
 
 static unsigned long xen_read_cr3(void)
 {
-	return percpu_read(xen_cr3);
+	return this_cpu_read(xen_cr3);
 }
 
 static void set_current_cr3(void *v)
 {
-	percpu_write(xen_current_cr3, (unsigned long)v);
+	this_cpu_write(xen_current_cr3, (unsigned long)v);
 }
 
 static void __xen_write_cr3(bool kernel, unsigned long cr3)
@@ -1306,7 +1306,7 @@ static void __xen_write_cr3(bool kernel, unsigned long cr3)
 	xen_extend_mmuext_op(&op);
 
 	if (kernel) {
-		percpu_write(xen_cr3, cr3);
+		this_cpu_write(xen_cr3, cr3);
 
 		/* Update xen_current_cr3 once the batch has actually
 		   been submitted. */
@@ -1322,7 +1322,7 @@ static void xen_write_cr3(unsigned long cr3)
 
 	/* Update while interrupts are disabled, so its atomic with
 	   respect to ipis */
-	percpu_write(xen_cr3, cr3);
+	this_cpu_write(xen_cr3, cr3);
 
 	__xen_write_cr3(true, cr3);
 

arch/x86/xen/multicalls.h

@@ -47,7 +47,7 @@ static inline void xen_mc_issue(unsigned mode)
 		xen_mc_flush();
 
 	/* restore flags saved in xen_mc_batch */
-	local_irq_restore(percpu_read(xen_mc_irq_flags));
+	local_irq_restore(this_cpu_read(xen_mc_irq_flags));
 }
 
 /* Set up a callback to be called when the current batch is flushed */

arch/x86/xen/smp.c

@@ -76,7 +76,7 @@ static void __cpuinit cpu_bringup(void)
 	xen_setup_cpu_clockevents();
 
 	set_cpu_online(cpu, true);
-	percpu_write(cpu_state, CPU_ONLINE);
+	this_cpu_write(cpu_state, CPU_ONLINE);
 	wmb();
 
 	/* We can take interrupts now: we're officially "up". */