linux-kernel - Re: [PATCH v2] remoteproc: use %pe format string to print return error code

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Message-ID: <CANLsYkyLgvMDx-CMLZPEdJ8rUuGX-=QgB++5fz_h_ordm_q1aA@mail.gmail.com>
Date:   Thu, 11 Nov 2021 11:18:18 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Mark-PK Tsai <mark-pk.tsai@...iatek.com>
Cc:     ohad@...ery.com, bjorn.andersson@...aro.org,
        matthias.bgg@...il.com, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, yj.chiang@...iatek.com
Subject: Re: [PATCH v2] remoteproc: use %pe format string to print return
 error code

Hi Mark,

On Tue, 2 Nov 2021 at 08:15, Mark-PK Tsai <mark-pk.tsai@...iatek.com> wrote:
>
> Use %pe format string to print return error code which
> make the error message easier to understand.
>
> Signed-off-by: Mark-PK Tsai <mark-pk.tsai@...iatek.com>
> ---
>  drivers/remoteproc/remoteproc_core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 502b6604b757..2242da320368 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -575,8 +575,8 @@ static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
>                                            dma_get_mask(rproc->dev.parent));
>         if (ret) {
>                 dev_warn(dev,
> -                        "Failed to set DMA mask %llx. Trying to continue... %x\n",
> -                        dma_get_mask(rproc->dev.parent), ret);
> +                        "Failed to set DMA mask %llx. Trying to continue... (%pe)\n",
> +                        dma_get_mask(rproc->dev.parent), ERR_PTR(ret));

Macro ERR_PTR() is used to convert error codes to pointer type when
returning from a function - I fail to see how doing so in a dev_warn()
context can make the message easier to understand.  Can you provide an
example?

Thanks,
Mathieu

>         }
>
>         /* parse the vrings */
> --
> 2.18.0
>