linux-kernel - Re: [PATCH2] CNS3xxx: Fix a WARN() related to IRQ allocation.

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Message-Id: <201403171533.50200.arnd@arndb.de>
Date:	Mon, 17 Mar 2014 15:33:49 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Krzysztof Hałasa <khalasa@...p.pl>,
	Russell King <linux@....linux.org.uk>,
	Anton Vorontsov <anton@...msg.org>,
	Yinghai Lu <yinghai@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH2] CNS3xxx: Fix a WARN() related to IRQ allocation.

On Tuesday 04 March 2014, Krzysztof Hałasa wrote:
> WARNING: at drivers/irqchip/irq-gic.c:952 gic_init_bases+0xe4/0x2b8()
> Cannot allocate irq_descs @ IRQ16, assuming pre-allocated
> Backtrace:
> gic_init_bases    from cns3xxx_init_irq+0x24/0x34
> cns3xxx_init_irq  from init_IRQ+0x24/0x2c
> init_IRQ          from start_kernel+0x1a8/0x338
> start_kernel      from 0x2000806c
> 
> The problem is that 64 CNS3xxx CPU interrupts, starting at 32, are
> allocated by the ARM platform-independent code (as requested by
> machine_desc->nr_irqs = 96), and then the GIC code tries to allocate
> them again.
> 
> Tested on Gateworks Laguna board, masqueraded as CNS3420VB.
> 
> Signed-off-by: Krzysztof Hałasa <khalasa@...p.pl>

Applied to next/fixes-non-critical.

	Arnd

> --- a/arch/arm/mach-cns3xxx/cns3420vb.c
> +++ b/arch/arm/mach-cns3xxx/cns3420vb.c
> @@ -246,7 +246,6 @@ static void __init cns3420_map_io(void)
>  
>  MACHINE_START(CNS3420VB, "Cavium Networks CNS3420 Validation Board")
>         .atag_offset    = 0x100,
> -       .nr_irqs        = NR_IRQS_CNS3XXX,
>         .map_io         = cns3420_map_io,
>         .init_irq       = cns3xxx_init_irq,
>         .init_time      = cns3xxx_timer_init,
> --- a/arch/arm/mach-cns3xxx/core.c
> +++ b/arch/arm/mach-cns3xxx/core.c
> @@ -400,7 +400,6 @@ static const char *cns3xxx_dt_compat[] __initdata = {
>  
>  DT_MACHINE_START(CNS3XXX_DT, "Cavium Networks CNS3xxx")
>         .dt_compat      = cns3xxx_dt_compat,
> -       .nr_irqs        = NR_IRQS_CNS3XXX,
>         .map_io         = cns3xxx_map_io,
>         .init_irq       = cns3xxx_init_irq,
>         .init_time      = cns3xxx_timer_init,

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