parisc: Check if IRQs are disabled when calling arch_local_irq_restore()

A trivial check to check if IRQs are on although they should be off.
Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/include/asm/irqflags.h

@@ -31,6 +31,11 @@ static inline unsigned long arch_local_irq_save(void)
 
 static inline void arch_local_irq_restore(unsigned long flags)
 {
+	/* warn if IRQs are on although they should be off */
+	if (IS_ENABLED(CONFIG_LIGHTWEIGHT_SPINLOCK_CHECK))
+		if (arch_local_save_flags() & PSW_I)
+			asm volatile("break 6,6\n"); /*  SPINLOCK_BREAK_INSN */
+
 	asm volatile("mtsm %0" : : "r" (flags) : "memory");
 }