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

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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>
This commit is contained in:
Boris Brezillon 2016-09-13 15:58:28 +02:00 committed by Thomas Gleixner
parent 9395452b4a
commit ebf9ff753c
1 changed files with 10 additions and 0 deletions
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10
include/linux/irq.h
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@ -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)
{