From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: "Cédric Le Goater" <clg@kaod.org>,
"Frederic Barrat" <fbarrat@linux.vnet.ibm.com>,
linuxppc-dev@lists.ozlabs.org
Cc: andrew.donnellan@au1.ibm.com, vaibhav@linux.vnet.ibm.com
Subject: Re: [RFC] powerpc/xive: Remove irq from queue when it is shutdown
Date: Fri, 16 Mar 2018 09:56:06 +1100 [thread overview]
Message-ID: <1521154566.16434.171.camel@kernel.crashing.org> (raw)
In-Reply-To: <ba73a10a-320c-914e-5d7e-1ff212fdd6c5@kaod.org>
On Wed, 2018-03-14 at 18:47 +0100, Cédric Le Goater wrote:
> We could also loop on the ESB 'P' bit to wait for the irqs to be handled,
> using :
>
> xive_esb_read(irq, XIVE_ESB_GET)
>
> which has no side effect. It looks simpler to me. Is that possible ?
But you can race with something sending another one... I prefer the
guarantee that after final masking, we check the queue contents on
shutdown.
That will be solid vs. other type of interrupts as well.
Cheers,
Ben.
next prev parent reply other threads:[~2018-03-15 22:56 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-14 16:58 [RFC] powerpc/xive: Remove irq from queue when it is shutdown Frederic Barrat
2018-03-14 17:47 ` Cédric Le Goater
2018-03-15 22:56 ` Benjamin Herrenschmidt [this message]
2018-03-15 22:59 ` Benjamin Herrenschmidt
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