genirq: Let irq thread follow the effective hard irq affinity

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In case of threaded interrupts the thread follows the affinity setting of
the hard interrupt. The related function uses the affinity mask which was
set by either from user space or via one of the kernel mechanisms. This
mask can be wider than the resulting effective affinity of the hard
interrupt. As a consequence the thread might become affine to a completely
different CPU.

Use the effective interrupt affinity if the architecture supports it, so
the hard interrupt and the thread stay on the same CPU.

Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

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Thomas Gleixner 2018-02-16 15:21:20 +01:00

parent 7928b2cbe5

commit cbf8699996

1 changed files with 7 additions and 3 deletions

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kernel/irq/manage.c

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