linux-kernel - Re: [PATCH 0/2] Fix v4.11 malta

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Date:   Fri, 31 Mar 2017 14:28:03 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Matt Redfearn <matt.redfearn@...tec.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <james.hogan@...tec.com>
Cc:     linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Paul Burton <paul.burton@...tec.com>
Subject: Re: [PATCH 0/2] Fix v4.11 malta_defconfig regressions

On 31/03/17 13:55, Matt Redfearn wrote:
> Hi Marc,
> 
> 
> On 31/03/17 13:04, Marc Zyngier wrote:
>> Hi Matt,
>>
>> On 31/03/17 12:05, Matt Redfearn wrote:
>>> Since v4.11-rc1, 3 regressions have been observed on the Malta platform,
>>> using malta_defconfig. which prevent it booting. These patches fix 2 of
>>> them. The third one is that malta_defconfig, which uses SMP-MT, no
>>> longer sets up its IPIs correctly resulting is a string of messages
>>> like:
>>>
>>> irq 23: nobody cared (try booting with the "irqpoll" option)
>>> CPU: 1 PID: 0 Comm: swapper/1 Tainted: G        W       4.11.0-rc4 #421
>>> Stack : 00000000 00000000 00000000 00000000 807cdff2 00000047 00000000 0000003d
>>>          80741327 8f093194 806c191c 00000000 00000001 807c9acc 80756078 807d0000
>>>          807cdbe4 80177c78 00000003 0000003c 00000006 80177a04 806c70a8 8f02be8c
>>>          00000006 801b4c8c 00000000 00000000 ffffffff 00000000 8f02be8c 80740000
>>>          00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
>>>          ...
>>> Call Trace:
>>> [<8010c6c0>] show_stack+0x88/0xa4
>>> [<80380fb8>] dump_stack+0x88/0xd0
>>> [<8017cf64>] __report_bad_irq+0x48/0x108
>>> [<8017d2d4>] note_interrupt+0x1c0/0x2fc
>>> [<80179ed4>] handle_irq_event_percpu+0x4c/0x64
>>> [<8017eafc>] handle_percpu_irq+0x88/0xb8
>>> [<801791c0>] generic_handle_irq+0x40/0x58
>>> [<80108664>] do_IRQ+0x18/0x24
>>> [<803b83fc>] plat_irq_dispatch+0x54/0xa8
>>> handlers:
>>> Disabling IRQ #23
>>>
>>> This regression is fixed by Paul Burtons series "MIPS/irqchip: Use IPI
>>> IRQ domains for CPU interrupt controller IPIs", but it is a large change
>>> for this stage in the cycle so I don't know how best to proceed with
>>> that one.
>>>
>>>
>>>
>>> Matt Redfearn (2):
>>>    MIPS: Malta: Fix i8259 irqchip setup
>>>    irqchip/mips-gic: Fix Local compare interrupt
>>>
>>>   arch/mips/mti-malta/malta-int.c | 13 +++++++++++++
>>>   drivers/irqchip/irq-mips-gic.c  |  4 ++++
>>>   2 files changed, 17 insertions(+)
>>>
>> I can take the GIC patch through the irq tree if that's convenient (I
>> was about to send a PR anyway). Just let me know.
>>
>> Thanks,
>>
>> 	M.
> 
> Yes that would be great, please. Ralf has just acked it.

OK. I'll you and Ralf deal with the i8259 patch separately.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...