From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <benh@kernel.crashing.org>
Received: from gate.crashing.org (gate.crashing.org [63.228.1.57])
	(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
	(Client did not present a certificate)
	by ozlabs.org (Postfix) with ESMTP id 121F9DDED2
	for <linuxppc-dev@ozlabs.org>; Fri,  9 Feb 2007 08:14:22 +1100 (EST)
Subject: Re: [PATCH 13/12] mpic: add affinity callback for IPI "chip"
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Johannes Berg <johannes@sipsolutions.net>
In-Reply-To: <1170940611.4385.56.camel@johannes.berg>
References: <20070207124536.963531000@sipsolutions.net>
	<1170940611.4385.56.camel@johannes.berg>
Content-Type: text/plain
Date: Fri, 09 Feb 2007 08:14:12 +1100
Message-Id: <1170969252.2620.335.camel@localhost.localdomain>
Mime-Version: 1.0
Cc: linuxppc-dev@ozlabs.org, linux-pm@lists.osdl.org
List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.ozlabs.org>
List-Unsubscribe: <https://ozlabs.org/mailman/listinfo/linuxppc-dev>,
	<mailto:linuxppc-dev-request@ozlabs.org?subject=unsubscribe>
List-Archive: <http://ozlabs.org/pipermail/linuxppc-dev>
List-Post: <mailto:linuxppc-dev@ozlabs.org>
List-Help: <mailto:linuxppc-dev-request@ozlabs.org?subject=help>
List-Subscribe: <https://ozlabs.org/mailman/listinfo/linuxppc-dev>,
	<mailto:linuxppc-dev-request@ozlabs.org?subject=subscribe>

On Thu, 2007-02-08 at 14:16 +0100, Johannes Berg wrote:
> This patch adds a dummy affinity callback for the IPI "chip" to avoid
> getting a warning ("Cannot set affinity for irq 251") when taking a
> CPU offline via sysfs or during suspend.

Wouldn't be a better option to make sure they have IRQF_PERCPU set and
that we don't do the affinity thing on interrupts with that flag when 
offlining a CPU ?

Ben.

> Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
> 
> --- linux-2.6-git.orig/arch/powerpc/sysdev/mpic.c	2007-02-08 00:19:46.105926568 +0100
> +++ linux-2.6-git/arch/powerpc/sysdev/mpic.c	2007-02-08 00:22:31.810926568 +0100
> @@ -700,6 +700,12 @@ static void mpic_end_ipi(unsigned int ir
>  	mpic_eoi(mpic);
>  }
>  
> +static void mpic_set_ipi_affinity(unsigned int irq, cpumask_t cpumask)
> +{
> +	/* we can't set affinity but also don't need to since we only
> +	 * send IPIs to online CPUs */
> +}
> +
>  #endif /* CONFIG_SMP */
>  
>  static void mpic_set_affinity(unsigned int irq, cpumask_t cpumask)
> @@ -788,6 +794,7 @@ static struct irq_chip mpic_ipi_chip = {
>  	.mask		= mpic_mask_ipi,
>  	.unmask		= mpic_unmask_ipi,
>  	.eoi		= mpic_end_ipi,
> +	.set_affinity	= mpic_set_ipi_affinity,
>  };
>  #endif /* CONFIG_SMP */
>