Commit ebf9ff75 authored Sep 13, 2016 by Boris Brezillon Committed by Thomas Gleixner Sep 13, 2016

genirq: Provide irq_gc_{lock_irqsave,unlock_irqrestore}() helpers



Some irqchip drivers need to take the generic chip lock outside of the
irq context.

Provide the irq_gc_{lock_irqsave,unlock_irqrestore}() helpers to allow
one to disable irqs while entering a critical section protected by
gc->lock.

Note that we do not provide optimized version of these helpers for !SMP,
because they are not called from the hot-path.

[ tglx: Added a comment when these helpers should be [not] used ]

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: stable@vger.kernel.org
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Link: http://lkml.kernel.org/r/1473775109-4192-1-git-send-email-boris.brezillon@free-electrons.com


Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

parent 9395452b

include/linux/irq.h

+10 −0

Original line number	Diff line number	Diff line
		@@ -945,6 +945,16 @@ static inline void irq_gc_lock(struct irq_chip_generic *gc) { }
		static inline void irq_gc_unlock(struct irq_chip_generic *gc) { }
		#endif

		/*
		* The irqsave variants are for usage in non interrupt code. Do not use
		* them in irq_chip callbacks. Use irq_gc_lock() instead.
		*/
		#define irq_gc_lock_irqsave(gc, flags) \
		raw_spin_lock_irqsave(&(gc)->lock, flags)

		#define irq_gc_unlock_irqrestore(gc, flags) \
		raw_spin_unlock_irqrestore(&(gc)->lock, flags)

		static inline void irq_reg_writel(struct irq_chip_generic *gc,
		u32 val, int reg_offset)
		{

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