On Tue, Jun 09, 2015 at 10:27:09PM +0100, Russell King - ARM Linux wrote:

It's because there exist platforms where specific IRQs are permanently
asserted, and unexpectedly claiming such an interrupt (eg, through IRQ
probing) would lock the system - at least before we ended up with the
detection in genirq (which has its roots in the ARM code.)

Ah, yes - now I remember.  I just had a vauge recollection of broken
probing.

I'd suggest people think carefully about applying these patches.  They
have only been around for a matter of hours, so to rush to apply them
when they haven't been revewied as a whole to assess whether the approach
is the right one is rather hasty.

I'm fairly comfortable with the patch for regmap as that code is
architecture neutral, should already have been consistent and the
non-ARM path has definitely been tested (I've done it myself).
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