linux-kernel - Re: [PATCH v2] irqchip: gic: Allow gic_arch

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Message-ID: <53EAB4BC.80205@codeaurora.org>
Date:	Tue, 12 Aug 2014 17:43:40 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Nicolas Pitre <nicolas.pitre@...aro.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] irqchip: gic: Allow gic_arch_extn hooks to call into
 scheduler

On 08/12/14 17:39, Nicolas Pitre wrote:
> On Tue, 12 Aug 2014, Stephen Boyd wrote:
>
>> On 08/05/14 19:34, Nicolas Pitre wrote:
>>>> It allows us to synchronize with another CPU that may be inside
>>>> gic_raise_softirq(). If the other CPU was in that function then this CPU
>>>> would wait until it was done sending the IPI to continue along and
>>>> reroute them. If the other CPU was just about to grab the sgi lock then
>>>> we would guarantee that the CPU would see the new gic_cpu_map value and
>>>> thus any redirection is not necessary.
>>> OK I get it now.
>>>
>>>> I hoped that the commit text explained this.
>>> I'm possibly not bright enough to get it the first time.
>>>
>>>> Honestly it probably isn't a noticeable performance boost either way 
>>>> but I think this is the best we can do.
>>> Sure, agreed.
>>>
>>>
>>>
>> Ok, so which patch is preferred?
> I'd say the later.
>
>

Sorry, it's not clear. I'll send v3 and hopefully it will be the right one.

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