x86/xen: Remove redundant irq_enter/exit() invocations

All these handlers are regular device interrupt handlers, so they already
went through the proper entry code which handles this correctly.

Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Juergen Gross <[email protected]>
Cc: Stefano Stabellini <[email protected]>
Cc: Boris Ostrovsky <[email protected]>
Cc: [email protected]
Cc: [email protected]
Reviewed-by: Juergen Gross <[email protected]>
Link: https://lore.kernel.org/r/877deicqqy.ffs@tglx
Signed-off-by: Boris Ostrovsky <[email protected]>

Author: KAGA-KOKO

arch/x86/xen/smp.c

@@ -268,20 +268,16 @@ void xen_send_IPI_allbutself(int vector)
 
 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
 {
-	irq_enter();
 	generic_smp_call_function_interrupt();
 	inc_irq_stat(irq_call_count);
-	irq_exit();
 
 	return IRQ_HANDLED;
 }
 
 static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
 {
-	irq_enter();
 	generic_smp_call_function_single_interrupt();
 	inc_irq_stat(irq_call_count);
-	irq_exit();
 
 	return IRQ_HANDLED;
 }

arch/x86/xen/smp_pv.c

@@ -458,10 +458,8 @@ static void xen_pv_stop_other_cpus(int wait)
 
 static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
 {
-	irq_enter();
 	irq_work_run();
 	inc_irq_stat(apic_irq_work_irqs);
-	irq_exit();
 
 	return IRQ_HANDLED;
 }