centos man page for enum_irq_gc_flags

ENUM 
IRQ_GC_FLAGS(9)						    Structures						      ENUM IRQ_GC_FLAGS(9)

NAME
       enum_irq_gc_flags - Initialization flags for generic irq chips

SYNOPSIS
       enum irq_gc_flags {
	 IRQ_GC_INIT_MASK_CACHE,
	 IRQ_GC_INIT_NESTED_LOCK
       };

CONSTANTS
       IRQ_GC_INIT_MASK_CACHE
	   Initialize the mask_cache by reading mask reg

       IRQ_GC_INIT_NESTED_LOCK
	   Set the lock class of the irqs to nested for irq chips which need to call irq_set_wake on the parent irq. Usually GPIO implementations

AUTHORS
       Thomas Gleixner <tglx@linutronix.de>
	   Author.

       Ingo Molnar <mingo@elte.hu>
	   Author.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						      ENUM IRQ_GC_FLAGS(9)