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

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Message-ID: <20160809172825.GB26240@tuxbot>
Date:	Tue, 9 Aug 2016 10:28:26 -0700
From:	Bjorn Andersson <bjorn.andersson@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel@...inux.com, patrice.chotard@...com, ohad@...ery.com,
	linux-remoteproc@...r.kernel.org, loic.pallardy@...com
Subject: Re: [PATCH 1/9] remoteproc: core: Ensure error message is clear

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>

Regards,
Bjorn

> ---
>  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);
>  
>  	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;
>  	}
> -- 
> 2.9.0
>