Re: [PATCH v2 23/23] PCI: aardvark: Make main irq_chip structure a static driver structure

On 2022-01-10 01:50, Marek Behún wrote:

Marc Zyngier says [1] that we should use struct irq_chip as a global
static struct in the driver. Even though the structure currently
contains a dynamic member (parent_device), Marc says [2] that he plans
to kill it and make the structure completely static.

We have already converted others irq_chip structures in this driver in
this way, but we omitted this one because the .name member is
dynamically created from device's name, and the name is displayed in
sysfs, so changing it would break sysfs ABI.

The rationale for changing the name (to "advk-INT") in spite of sysfs
ABI, and thus allowing to convert to a static structure, is that after
the other changes we made in this series, the IRQ chip is basically
something different: it no logner generates ERR and PME interrupts 
(they
are generated by emulated bridge's rp_irq_chip).

There is no 'is spite of the ABI'. If you don't understand why
we don't break the ABI, you have an even bigger problem.

So NAK to this patch, now and forever. Any change to the structure to
make it read-only must allow the preservation of the existing names
when they are generated by the driver.

         M.
-- 
Jazz is not dead. It just smells funny...

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