On Thu, 11 Nov 2021 at 19:13, Mark-PK Tsai <mark-pk.tsai@xxxxxxxxxxxx> wrote:
>
> > Hi Mark,
> >
> >
> > >
> > > 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@xxxxxxxxxxxx>
> > > ---
> > > 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?
>
> Hi,
>
> When dma_coerce_mask_and_coherent() fail, the output log will be as following.
>
> format log
> %x Trying to continue... fffffffb
> %d Trying to continue... -5
> %pe Trying to continue... -5 (if CONFIG_SYMBOLIC_ERRNAME is not set)
> %pe Trying to continue... -EIO (if CONFIG_SYMBOLIC_ERRNAME=y)
When failing, functions dma_coerce_mask_and_coherent() returns -EIO.
Casting that to a (void *) with ERR_PTR() does not change that value.
Since variable @ret is already declared as "int" the real fix is to
change "%x" to "%d".
