genirq: Implement irq_percpu_is_enabled()

Certain interrupt controller drivers have a register set that does not
make it easy to save/restore the mask of enabled/disabled interrupts
at suspend/resume time. At resume time, such drivers rely on the core
kernel irq subsystem to tell whether such or such interrupt is enabled
or not, in order to restore the proper state in the interrupt
controller register.

While the irqd_irq_disabled() provides the relevant information for
global interrupts, there is no similar function to query the
enabled/disabled state of a per-CPU interrupt.

Therefore, this commit complements the percpu_irq API with an
irq_percpu_is_enabled() function.

[ tglx: Simplified the implementation and added kerneldoc ]

Signed-off-by: Thomas Petazzoni <[email protected]>
Cc: [email protected]
Cc: Tawfik Bayouk <[email protected]>
Cc: Nadav Haklai <[email protected]>
Cc: Lior Amsalem <[email protected]>
Cc: Andrew Lunn <[email protected]>
Cc: Sebastian Hesselbarth <[email protected]>
Cc: Gregory Clement <[email protected]>
Cc: Jason Cooper <[email protected]>
Cc: Marc Zyngier <[email protected]>
Link: http://lkml.kernel.org/r/1445347435-2333-2-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Thomas Gleixner <[email protected]>

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