linux-kernel - Re: [PATCH] IRQ: normalize chip->irq_set_affinity return value on x86 and IA64

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Date:	Thu, 29 Mar 2012 11:58:49 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jiang Liu <liuj97@...il.com>
cc:	Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
	Jes Sorensen <jes@....com>, Ingo Molnar <mingo@...hat.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Thomas Meyer <thomas@...3r.de>,
	Jiang Liu <jiang.liu@...wei.com>, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-altix@....com, x86@...nel.org,
	chenkeping@...wei.com
Subject: Re: [PATCH] IRQ: normalize chip->irq_set_affinity return value on
 x86 and IA64

On Tue, 6 Mar 2012, Jiang Liu wrote:

> On x86 and IA64 platforms, interrupt controller chip's irq_set_affinity()
> method always copies affinity mask to irq_data->affinity field but still
> returns 0(IRQ_SET_MASK_OK). That return value causes the interrupt core
> logic unnecessarily copies the mask to irq_data->affinity field again.
> So return IRQ_SET_MASK_OK_NOCOPY instead of IRQ_SET_MASK_OK to get rid of
> the duplicated copy operation.
> 
> This patch applies to v3.3-rc6 and has been tested on x86 platforms.
> 
> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
> ---
>  arch/ia64/kernel/iosapic.c     |    4 +++-
>  arch/ia64/kernel/msi_ia64.c    |    4 ++--
>  arch/ia64/sn/kernel/irq.c      |    2 +-
>  arch/ia64/sn/kernel/msi_sn.c   |    2 +-
>  arch/x86/kernel/apic/io_apic.c |   11 ++++++-----
>  arch/x86/platform/uv/uv_irq.c  |    2 +-
>  kernel/irq/internals.h         |    3 +++
>  kernel/irq/manage.c            |   39 ++++++++++++++++++++++-----------------
>  kernel/irq/migration.c         |    6 +-----


This does not work that way. The patch wants to be split in 3 parts
(core, x86, ia64). The patches are completely independent. Please
resend.

Thanks,

	tglx
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