linux-kernel - Re: [PATCH v5 08/11] powerpc/pseries/iommu: Update remove_dma

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Message-ID: <2653ee3e582ba181651e4842821e64d3323fa566.camel@gmail.com>
Date:   Tue, 17 Aug 2021 02:59:46 -0300
From:   Leonardo Brás <leobras.c@...il.com>
To:     Frederic Barrat <fbarrat@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        David Gibson <david@...son.dropbear.id.au>,
        kernel test robot <lkp@...el.com>,
        Nicolin Chen <nicoleotsuka@...il.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 08/11] powerpc/pseries/iommu: Update
 remove_dma_window() to accept property name

Hello Fred, thanks for the feedback!

On Tue, 2021-07-20 at 19:51 +0200, Frederic Barrat wrote:
> 
> 
> On 16/07/2021 10:27, Leonardo Bras wrote:
> > Update remove_dma_window() so it can be used to remove DDW with a
> > given
> > property name.
> > 
> > This enables the creation of new property names for DDW, so we can
> > have different usage for it, like indirect mapping.
> > 
> > Signed-off-by: Leonardo Bras <leobras.c@...il.com>
> > Reviewed-by: Alexey Kardashevskiy <aik@...abs.ru>
> > ---
> >   arch/powerpc/platforms/pseries/iommu.c | 21 +++++++++++----------
> >   1 file changed, 11 insertions(+), 10 deletions(-)
> > 
> > diff --git a/arch/powerpc/platforms/pseries/iommu.c
> > b/arch/powerpc/platforms/pseries/iommu.c
> > index 108c3dcca686..17c6f4706e76 100644
> > --- a/arch/powerpc/platforms/pseries/iommu.c
> > +++ b/arch/powerpc/platforms/pseries/iommu.c
> > @@ -830,31 +830,32 @@ static void remove_dma_window(struct
> > device_node *np, u32 *ddw_avail,
> >                         np, ret, ddw_avail[DDW_REMOVE_PE_DMA_WIN],
> > liobn);
> >   }
> >   
> > -static void remove_ddw(struct device_node *np, bool remove_prop)
> > +static int remove_ddw(struct device_node *np, bool remove_prop,
> > const char *win_name)
> >   {
> 
> 
> Why switch to returning an int? None of the callers check it.

IIRC, in a previous version it did make sense, which is not the case
anymore. I will revert this.

Thanks!

> 
>    Fred