linux-kernel - Re: [PATCH 1/9] remoteproc: core: Ensure error message is clear

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Date:	Wed, 10 Aug 2016 15:11:11 -0500
From:	Suman Anna <s-anna@...com>
To:	Lee Jones <lee.jones@...aro.org>,
	Bjorn Andersson <bjorn.andersson@...aro.org>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel@...inux.com" <kernel@...inux.com>,
	"patrice.chotard@...com" <patrice.chotard@...com>,
	"ohad@...ery.com" <ohad@...ery.com>,
	"linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
	"loic.pallardy@...com" <loic.pallardy@...com>
Subject: Re: [PATCH 1/9] remoteproc: core: Ensure error message is clear

On 08/09/2016 01:12 PM, Lee Jones wrote:
> On Tue, 09 Aug 2016, Bjorn Andersson wrote:
> 
>> On Thu 04 Aug 02:21 PDT 2016, Lee Jones wrote:
>>
>>> Before this patch, the dma_alloc_coherent() failure path printed out:
>>>
>>>   "dma_alloc_coherent err: 16760832"
>>>
>>> ... alluding to the Linux error code being 16760832, but seeing as
>>> Linux error codes are all negative, this looks like a signed/unsigned
>>> issue.  In fact, the message is trying to print the length of the
>>> requested memory region.  Let's clear that up.
>>>
>>> While we're at it, let's standardise the way 'len' is printed.  In
>>> all other locations 'len' is in hex prefixed by a '0x' for clarity.
>>>
>>> Signed-off-by: Lee Jones <lee.jones@...aro.org>
>>
>> Acked-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> 
> Again, this can just be applied.
> 
>>> ---
>>>  drivers/remoteproc/remoteproc_core.c | 5 +++--
>>>  1 file changed, 3 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
>>> index aea29a75c..3566dc9 100644
>>> --- a/drivers/remoteproc/remoteproc_core.c
>>> +++ b/drivers/remoteproc/remoteproc_core.c
>>> @@ -581,7 +581,7 @@ static int rproc_handle_carveout(struct rproc *rproc,
>>>  		return -EINVAL;
>>>  	}
>>>  
>>> -	dev_dbg(dev, "carveout rsc: da %x, pa %x, len %x, flags %x\n",
>>> +	dev_dbg(dev, "carveout rsc: da %x, pa %x, len 0x%x, flags %x\n",
>>>  			rsc->da, rsc->pa, rsc->len, rsc->flags);

If you are modifying this trace, it's better to following the leading 0x
convention on all arguments rather than just the length.

regards
Suman

>>>  
>>>  	carveout = kzalloc(sizeof(*carveout), GFP_KERNEL);
>>> @@ -590,7 +590,8 @@ static int rproc_handle_carveout(struct rproc *rproc,
>>>  
>>>  	va = dma_alloc_coherent(dev->parent, rsc->len, &dma, GFP_KERNEL);
>>>  	if (!va) {
>>> -		dev_err(dev->parent, "dma_alloc_coherent err: %d\n", rsc->len);
>>> +		dev_err(dev->parent,
>>> +			"failed to allocate dma memory: len 0x%x\n", rsc->len);
>>>  		ret = -ENOMEM;
>>>  		goto free_carv;
>>>  	}
>