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This reverts commit 74def747

.

The change to the helper function is only correct for the /proc/irq/
readout usage, but breaks the existing x86 usage of that function.
Reported-by: Yanko Kaneti <yaneti@declera.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Marc Zyngier <marc.zyngier@arm.com>