linux-kernel - Re: [PATCH] irqchip/mbigen: stop printing kernel addresses

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Date:   Tue, 18 Jun 2019 08:48:56 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        <linux-kernel@...r.kernel.org>, <guohanjun@...wei.com>
Subject: Re: [PATCH] irqchip/mbigen: stop printing kernel addresses

Hi Kefeng,

On Tue, 18 Jun 2019 04:22:02 +0100,
Kefeng Wang <wangkefeng.wang@...wei.com> wrote:
> 
> After commit ad67b74d2469d9b8 ("printk: hash addresses printed with %p"),
> it will print "____ptrval____" instead of actual addresses when mbigen
> create domain fails,
> 
>   Hisilicon MBIGEN-V2 HISI0152:00: Failed to create mbi-gen@(____ptrval____) irqdomain
>   Hisilicon MBIGEN-V2: probe of HISI0152:00 failed with error -12
> 
> Instead of changing the print to "%px", and leaking kernel addresses,
> just remove the print completely.
> 
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
>  drivers/irqchip/irq-mbigen.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c
> index 98b6e1d4b1a6..d0cf596c801b 100644
> --- a/drivers/irqchip/irq-mbigen.c
> +++ b/drivers/irqchip/irq-mbigen.c
> @@ -355,8 +355,7 @@ static int mbigen_device_probe(struct platform_device *pdev)
>  		err = -EINVAL;
>  
>  	if (err) {
> -		dev_err(&pdev->dev, "Failed to create mbi-gen@%p irqdomain",
> -			mgn_chip->base);
> +		dev_err(&pdev->dev, "Failed to create mbi-gen irqdomain");

The alternative would be to print res as a resource, which would still
help identifying the offending device by printing its physical
layout, and still not reveal much.

Just let me know what you prefer.

Thanks,

	M.

>  		return err;
>  	}
>  
> -- 
> 2.20.1
> 

-- 
Jazz is not dead, it just smells funny.