linux-kernel - Re: [PATCH v3 3/5] irqchip: gicv3-its: add limitation to page order

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Date:	Thu, 05 Mar 2015 11:22:52 +0000
From:	Marc Zyngier <marc.zyngier@....com>
To:	Yun Wu <wuyun.wu@...wei.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"jason@...edaemon.net" <jason@...edaemon.net>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 3/5] irqchip: gicv3-its: add limitation to page order

On 04/03/15 03:18, Yun Wu wrote:
> When required size of Device Table is out of the page allocator's
> capability, the whole ITS will fail in probing. This actually is
> not the hardware's problem and is mainly a limitation of the kernel
> page allocator. This patch will keep ITS going on to the next
> initializaion stage with an explicit warning.
> 
> Signed-off-by: Yun Wu <wuyun.wu@...wei.com>
> ---
>  drivers/irqchip/irq-gic-v3-its.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index f5bfa42..e8bda0b 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -828,6 +828,11 @@ static int its_alloc_tables(struct its_node *its)
>  			u32 ids = GITS_TYPER_DEVBITS(typer);
> 
>  			order = get_order((1UL << ids) * entry_size);
> +			if (order >= MAX_ORDER) {
> +				order = MAX_ORDER - 1;
> +				pr_warn("%s: DT size too large, reduce page order to %u\n",

Please spell out device table instead of DT. Most people will interpret
DT as Device Tree, and won't immediately get what is happening.

Thanks,

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