irqchip: mips-cpu: Replace magic 0x100 with IE_SW0

Replace use of the magic number 0x100 (ie. bit 8) with the more
explanatory IE_SW0 (ie. interrupt enable for software interrupt 0) or
C_SW0 (ie. cause bit for software interrupt 0) as appropriate.

Signed-off-by: Paul Burton <[e-mail]>
Acked-by: Thomas Gleixner <[e-mail]>
Cc: Jason Cooper <[e-mail]>
Cc: Marc Zyngier <[e-mail]>
Cc: [e-mail]
Patchwork: https://patchwork.linux-mips.org/patch/15834/
Signed-off-by: Ralf Baechle <[e-mail]>

drivers/irqchip/irq-mips-cpu.c

···
 
 static inline void unmask_mips_irq(struct irq_data *d)
 {
-	set_c0_status(0x100 << (d->irq - MIPS_CPU_IRQ_BASE));
+	set_c0_status(IE_SW0 << (d->irq - MIPS_CPU_IRQ_BASE));
 	irq_enable_hazard();
 }
 
 static inline void mask_mips_irq(struct irq_data *d)
 {
-	clear_c0_status(0x100 << (d->irq - MIPS_CPU_IRQ_BASE));
+	clear_c0_status(IE_SW0 << (d->irq - MIPS_CPU_IRQ_BASE));
 	irq_disable_hazard();
 }
 
···
 {
 	unsigned int vpflags = dvpe();
 
-	clear_c0_cause(0x100 << (d->irq - MIPS_CPU_IRQ_BASE));
+	clear_c0_cause(C_SW0 << (d->irq - MIPS_CPU_IRQ_BASE));
 	evpe(vpflags);
 	unmask_mips_irq(d);
 	return 0;
···
 static void mips_mt_cpu_irq_ack(struct irq_data *d)
 {
 	unsigned int vpflags = dvpe();
-	clear_c0_cause(0x100 << (d->irq - MIPS_CPU_IRQ_BASE));
+	clear_c0_cause(C_SW0 << (d->irq - MIPS_CPU_IRQ_BASE));
 	evpe(vpflags);
 	mask_mips_irq(d);
 }