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

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Date:   Tue, 18 Jun 2019 16:35:53 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Marc Zyngier <marc.zyngier@....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



On 2019/6/18 15:48, Marc Zyngier wrote:
> 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.

It's better to print res to show the physical layout, and add missing "\n",
will resend v2.

Thanks.

> 
> Just let me know what you prefer.
> 
> Thanks,
> 
> 	M.
> 
>>  		return err;
>>  	}
>>  
>> -- 
>> 2.20.1
>>
>