linux-kernel - Re: [PATCH 0/8] tip related: radix tree for spareseirq and logical flat clean up

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Date:	Sat, 13 Feb 2010 16:49:03 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Rusty Russell <rusty@...tcorp.com.au>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	linux-kernel@...r.kernel.org, Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [PATCH  0/8] tip related: radix tree for spareseirq and logical
 flat clean up

On 02/13/2010 04:30 PM, Eric W. Biederman wrote:
> Yinghai Lu <yinghai@...nel.org> writes:
>>
>> Subject: [PATCH] x86: use vector_desc instead of vector_irq
>>
>> Eric pointed out that radix tree version of irq_to_desc will magnify delay on the path
>> of handle_irq.
>> use vector_desc to reduce the calling of irq_to_desc.
>>
>> next step: need to change all ack, mask, umask, eoi for all irq_chip to take irq_desc
>>
>> -v2: irq should be unsigned in 32bit handle_irq according to Eric
>>      also reset vector_desc for lguest in setup_irq
>>
>> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>>
>> Index: linux-2.6/arch/x86/kernel/irq_32.c
>> ===================================================================
>> --- linux-2.6.orig/arch/x86/kernel/irq_32.c
>> +++ linux-2.6/arch/x86/kernel/irq_32.c
>> @@ -76,7 +76,7 @@ static void call_on_stack(void *func, vo
>>  }
>>  
>>  static inline int
>> -execute_on_irq_stack(int overflow, struct irq_desc *desc, int irq)
>> +execute_on_irq_stack(int overflow, struct irq_desc *desc)
>>  {
>>  	union irq_ctx *curctx, *irqctx;
>>  	u32 *isp, arg1, arg2;
>> @@ -189,24 +189,22 @@ asmlinkage void do_softirq(void)
> 
> This looks like it will fail to build here.
> Don't you need to update the assembly to use desc->irq instead
> of the now removed irq parameter?

ah, will fix that.

YH
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