linux-kernel - Re: [PATCH 3/8] irq: make set_affinity to return status -v2

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Date:	Thu, 16 Apr 2009 11:08:26 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/8] irq: make set_affinity to return status -v2


* Yinghai Lu <yinghai@...nel.org> wrote:

> Impact: prepare to use it to keep affinity consistent
> 
> according to Ingo, change set_affinity() in irq_chip to return int.
> 
> v2: fix two typo
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> 
> ---
>  arch/alpha/kernel/sys_dp264.c         |    8 +++-
>  arch/alpha/kernel/sys_titan.c         |    4 +-
>  arch/arm/common/gic.c                 |    4 +-
>  arch/cris/arch-v32/kernel/irq.c       |    4 +-
>  arch/ia64/hp/sim/hpsim_irq.c          |    3 +
>  arch/ia64/kernel/iosapic.c            |   10 +++--
>  arch/ia64/kernel/msi_ia64.c           |   16 +++++---
>  arch/ia64/sn/kernel/irq.c             |    4 +-
>  arch/ia64/sn/kernel/msi_sn.c          |    8 ++--
>  arch/mips/cavium-octeon/octeon-irq.c  |    8 +++-
>  arch/mips/include/asm/irq.h           |    2 -
>  arch/mips/kernel/irq-gic.c            |    5 +-
>  arch/mips/mti-malta/malta-smtc.c      |    4 +-
>  arch/mips/sibyte/bcm1480/irq.c        |    8 ++--
>  arch/mips/sibyte/sb1250/irq.c         |    8 ++--
>  arch/parisc/kernel/irq.c              |    6 ++-
>  arch/powerpc/platforms/pseries/xics.c |   12 +++---
>  arch/powerpc/sysdev/mpic.c            |    4 +-
>  arch/sparc/kernel/irq_64.c            |   12 ++++--
>  arch/x86/kernel/apic/io_apic.c        |   64 +++++++++++++++++++++-------------
>  drivers/parisc/iosapic.c              |    6 ++-
>  drivers/xen/events.c                  |   12 +++---
>  include/linux/irq.h                   |    2 -
>  23 files changed, 140 insertions(+), 74 deletions(-)

Yeah, this patch looks _much_ nicer than the open-coded cpumask-copy 
lines. It makes it really apparent which architectures can fail the 
affinity setting and which not.

This is proper layered design - the previous patch was open-coding 
implementation details into the affinity-setting handlers and was 
thus obfuscating the code and was making it harder to maintain.

There is one omission: this should be Cc:-ed to 
linux-arch@...r.kernel.org, because it affects all architectures.

	Ingo
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