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Subject[PATCH 4.4 086/118] genirq: Provide irq_gc_{lock_irqsave,unlock_irqrestore}() helpers
4.4-stable review patch.  If anyone has any objections, please let me know.


From: Boris Brezillon <>

commit ebf9ff753c041b296241990aef76163bbb2cc9c8 upstream.

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

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 <>
Cc: Jason Cooper <>
Cc: Marc Zyngier <>
Cc: Nicolas Ferre <>
Cc: Alexandre Belloni <>
Signed-off-by: Thomas Gleixner <>
Signed-off-by: Greg Kroah-Hartman <>

include/linux/irq.h | 10 ++++++++++
1 file changed, 10 insertions(+)

--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -916,6 +916,16 @@ static inline void irq_gc_lock(struct ir
static inline void irq_gc_unlock(struct irq_chip_generic *gc) { }

+ * 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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