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

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Date:   Fri, 31 Mar 2017 13:04:13 +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

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