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

    ------------------

    From: Boris Brezillon <boris.brezillon@free-electrons.com>

    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
    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: 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>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    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) { }
    #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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