From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: "Cédric Le Goater" <clg@kaod.org>,
"Alexey Kardashevskiy" <aik@ozlabs.ru>,
linuxppc-dev@lists.ozlabs.org
Cc: Greg Kurz <groug@kaod.org>, Nicholas Piggin <npiggin@gmail.com>,
Paul Mackerras <paulus@samba.org>,
Alistair Popple <alistair@popple.id.au>,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [RFC PATCH kernel] powerpc/xive: Drop deregistered irqs
Date: Mon, 15 Jul 2019 08:48:05 +1000 [thread overview]
Message-ID: <1c6ed554525d419d71dbe3e0a06b98b7a33eeb5c.camel@kernel.crashing.org> (raw)
In-Reply-To: <1ab709c5-b6b6-c153-a8e9-5340cb77443a@kaod.org>
On Sun, 2019-07-14 at 21:44 +0200, Cédric Le Goater wrote:
> > Well, best is probably to do just that though, but call it something
> > like ppc_md.orphan_irq() or something like that instead. Another option
> > as you mention is to try to scrub queues, but that's trickier to do due
> > to the lockless nature of the queue handling.
>
> When the IRQ is shutdown, couldn't we cleanup the CPU EQ by filtering
> all the dangling entries, and replacing them with zeroes ? That would
> be alternative 1, but I don't think we need to scan all cpus. The last
> target should be enough.
It's a bit tricky due to the lockless nature of the queues...
Cheers,
Ben.
next prev parent reply other threads:[~2019-07-14 22:50 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-12 8:20 [RFC PATCH kernel] powerpc/xive: Drop deregistered irqs Alexey Kardashevskiy
2019-07-12 8:29 ` Benjamin Herrenschmidt
2019-07-12 9:37 ` Alexey Kardashevskiy
2019-07-12 23:47 ` Benjamin Herrenschmidt
2019-07-13 8:53 ` Alexey Kardashevskiy
2019-07-14 1:31 ` Benjamin Herrenschmidt
2019-07-14 19:44 ` Cédric Le Goater
2019-07-14 22:48 ` Benjamin Herrenschmidt [this message]
2019-07-14 19:14 ` Daniel Henrique Barboza
2019-07-15 2:27 ` Alexey Kardashevskiy
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