linux-kernel - Re: [PATCH] [genirq] Expose default irq affinity mask

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Message-ID: <48372E2E.4020902@qualcomm.com>
Date:	Fri, 23 May 2008 13:50:54 -0700
From:	Max Krasnyanskiy <maxk@...lcomm.com>
To:	Randy Dunlap <rdunlap@...otime.net>
CC:	mingo@...e.hu, linux-kernel@...r.kernel.org, pj@....com,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de
Subject: Re: [PATCH] [genirq] Expose default irq affinity mask

Randy Dunlap wrote:
> On Fri, 23 May 2008 12:46:35 -0700 Max Krasnyansky wrote:
> 
>> Current IRQ affinity interface does not provide a way to set affinity
>> for the IRQs that will be allocated/activated in the future.
>> This patch creates /proc/irq/default_smp_affinity that lets users set
>> default affinity mask for the newly allocated IRQs. Changing default
>> does not affect affinity masks for the currently active IRQs, they
>> have to be changed explicitly.
> 
> Documentation, perhaps an update to Documentation/filesystems/proc.txt ?
Absolutely. I wanted to see if it gets accepted first.

> 
>> Signed-off-by: Max Krasnyansky <maxk@...lcomm.com>
>> ---
>>  arch/alpha/kernel/irq.c |    5 +--
>>  include/linux/irq.h     |   14 ++++-------
>>  kernel/irq/manage.c     |   28 +++++++++++++++++++++-
>>  kernel/irq/proc.c       |   57 ++++++++++++++++++++++++++++++++++++++++++++++-
>>  4 files changed, 89 insertions(+), 15 deletions(-)
>>
>> diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
>> index 438a014..90f9ccc 100644
>> --- a/kernel/irq/manage.c
>> +++ b/kernel/irq/manage.c
>> @@ -16,6 +16,8 @@
>>  
>>  #ifdef CONFIG_SMP
>>  
>> +cpumask_t irq_default_affinity = CPU_MASK_ALL;
>> +
>>  /**
>>   *	synchronize_irq - wait for pending IRQ handlers (on other CPUs)
>>   *	@irq: interrupt number to wait for
>> @@ -94,6 +96,27 @@ int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
>>  	return 0;
>>  }
>>  
>> +#ifndef CONFIG_AUTO_IRQ_AFFINITY
>> +/**
>> + * Generic version of the affinity autoselector.
>> + */
> 
> Please don't use /** as the beginning of a comment block unless that
> comment block is in kernel-doc format (this one is not).

Oops, my bad. Did it again. Will fix.

Max

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