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Re: [PATCH 1/2] xen-pciback: Use dev_printk() when possible


  • To: Bjorn Helgaas <helgaas@xxxxxxxxxx>
  • From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
  • Date: Wed, 27 May 2020 19:18:48 -0400
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  • Cc: Juergen Gross <jgross@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bjorn Helgaas <bhelgaas@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx
  • Delivery-date: Wed, 27 May 2020 23:19:17 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 5/27/20 6:50 PM, Bjorn Helgaas wrote:
> On Wed, May 27, 2020 at 03:34:26PM -0700, Boris Ostrovsky wrote:
>> On 5/27/20 1:43 PM, Bjorn Helgaas wrote:
>>> @@ -155,8 +157,8 @@ int xen_pcibk_config_read(struct pci_dev *dev, int 
>>> offset, int size,
>>>     u32 value = 0, tmp_val;
>>>  
>>>     if (unlikely(verbose_request))
>>> -           printk(KERN_DEBUG DRV_NAME ": %s: read %d bytes at 0x%x\n",
>>> -                  pci_name(dev), size, offset);
>>> +           dev_printk(KERN_DEBUG, &dev->dev, "read %d bytes at 0x%x\n",
>>> +                      size, offset);
>>
>> Maybe then dev_dbg() ?
> printk(KERN_DEBUG) always produces output, so I used
> dev_printk(KERN_DEBUG) to retain that behavior.
>
> dev_dbg() does not always produce output, since it depends on DEBUG or
> CONFIG_DYNAMIC_DEBUG and the dynamic debug settings.


Oh, I didn't realize it needs either of these.


>
> If dev_dbg() seems like the right thing, I would probably add a
> separate patch on top to convert dev_printk(KERN_DEBUG) to dev_dbg().


I think anyone who wants to see those messages ought to have at least
CONFIG_DYNAMIC_DEBUG, especially since they are under verbose_request
(which also should go away IMO). In fact, I wonder whether this code
predates dynamic debugging, it's been there for almost 10 years.


I'll leave it to you whether you want to add another patch.


Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>





 


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