Benjamin Herrenschmidt wrote:
I have neither b) nor c) nowadays on powerpc.... "linux" irq numbers are purely a virtual thing, that is an index in irq_desc array and something we give to drivers to do request_irq() from. They can map onto hw interrupts, MSI-like messages, environment interrupts, could be hypervisor messgaes, in fact, it could be anything that remotely looks like an interrupt and the concept of "hw vector" is very blurry here... every interrupt controller defines it's own hardware vector space. On pSeries, hardware vectors are fairly big numbers that can encode the geographical location of the slot where the device is connected to, on some other hypervisor, they are 64 bits "tokens" representing an hypervisor object that can send events, etc etc....
Indeed... The return value from return_irq() is purely a cookie, and has been for quite some time.
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