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Subject: Re: Regression in v4.2-rc1 caused by hierarchical irqdomain changes
To: Thomas Gleixner <tglx@linutronix.de>,
        Matt Fleming <matt@codeblueprint.co.uk>
References: <20150727152107.GA3571@codeblueprint.co.uk>
 <55B65DD8.9020002@linux.intel.com>
 <20150727211502.GA2492@codeblueprint.co.uk>
 <alpine.DEB.2.11.1507292245000.3825@nanos>
Cc: linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
        Ingo Molnar <mingo@kernel.org>, Wolfram Sang <wsa@the-dreams.de>,
        linux-i2c@vger.kernel.org
From: Jiang Liu <jiang.liu@linux.intel.com>
Organization: Intel
Message-ID: <55B9A351.1060702@linux.intel.com>
Date: Thu, 30 Jul 2015 12:08:49 +0800
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On 2015/7/30 5:03, Thomas Gleixner wrote:
> On Mon, 27 Jul 2015, Matt Fleming wrote:
>> [BAD]
>>   3:          1          0          0          0  IR-IO-APIC   3-edge    
>>   6:          0          0          0          0  IR-IO-APIC   6-edge      dw_dmac
>>   7:         15          1          0          0  IR-IO-APIC   7-edge      INT3432:00, INT3433:00
> 
> [GOOD]
>>   3:         16         17         49         20  IR-IO-APIC-fasteoi   AudioDSP, dw_dmac
>>   6:          0          0          0          0  IR-IO-APIC-fasteoi   dw_dmac
>>   7:       2662       3072      12307       5419  IR-IO-APIC-fasteoi   INT3432:00, INT3433:00
> 
> So the old code uses fasteoi while the new one uses edge.
> 
> Jiang????
Sorry for the slow response.
We have reproduced this regression on Surface Pro 3, but are still
trying to figure out the root cause.
Thanks!
Gerry
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