Re: [PATCH] xen/events: fix setting irq affinity

From: Greg KH <greg@kroah.com>
To: Juergen Gross <jgross@suse.com>
Cc: stable@vger.kernel.org,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	xen-devel@lists.xenproject.org
Subject: Re: [PATCH] xen/events: fix setting irq affinity
Date: Thu, 15 Apr 2021 15:57:33 +0200	[thread overview]
Message-ID: <YHhGTZFXzPg+FaEq@kroah.com> (raw)
In-Reply-To: <20210412062845.13946-1-jgross@suse.com>

On Mon, Apr 12, 2021 at 08:28:45AM +0200, Juergen Gross wrote:
> The backport of upstream patch 25da4618af240fbec61 ("xen/events: don't
> unmask an event channel when an eoi is pending") introduced a
> regression for stable kernels 5.10 and older: setting IRQ affinity for
> IRQs related to interdomain events would no longer work, as moving the
> IRQ to its new cpu was not included in the irq_ack callback for those
> events.
> 
> Fix that by adding the needed call.
> 
> Note that kernels 5.11 and later don't need the explicit moving of the
> IRQ to the target cpu in the irq_ack callback, due to a rework of the
> affinity setting in kernel 5.11.
> 
> Signed-off-by: Juergen Gross <jgross@suse.com>
> ---
> This patch should be applied to all stable kernel branches up to
> (including) linux-5.10.y, where upstream patch 25da4618af240fbec61 has
> been added.

Now queued up, thanks.

greg k-h