linux-kernel - Re: [PATCH] dma: ixm-dma: fix warning comparison of distinct pointer types

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Date:   Tue, 15 Jan 2019 15:14:12 +0100
From:   Anders Roxell <anders.roxell@...aro.org>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Vinod <vkoul@...nel.org>, Dan Williams <dan.j.williams@...el.com>,
        dmaengine@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dma: ixm-dma: fix warning comparison of distinct pointer types

On Mon, 14 Jan 2019 at 22:24, Fabio Estevam <festevam@...il.com> wrote:
>
> Hi Anders,
>
> On Thu, Jan 10, 2019 at 9:15 AM Anders Roxell <anders.roxell@...aro.org> wrote:
> >
> > The warning got introduced by commit 930507c18304 ("arm64: add basic
> > Kconfig symbols for i.MX8"). Since it got enabled for arm64. The warning
> > haven't been seen before since size_t was 'unsigned int' when built on
> > arm32.
> >
> > ../drivers/dma/imx-dma.c: In function ‘imxdma_sg_next’:
> > ../include/linux/kernel.h:846:29: warning: comparison of distinct pointer types lacks a cast
> >    (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
> >                              ^~
> > ../include/linux/kernel.h:860:4: note: in expansion of macro ‘__typecheck’
> >    (__typecheck(x, y) && __no_side_effects(x, y))
> >     ^~~~~~~~~~~
> > ../include/linux/kernel.h:870:24: note: in expansion of macro ‘__safe_cmp’
> >   __builtin_choose_expr(__safe_cmp(x, y), \
> >                         ^~~~~~~~~~
> > ../include/linux/kernel.h:879:19: note: in expansion of macro ‘__careful_cmp’
> >  #define min(x, y) __careful_cmp(x, y, <)
> >                    ^~~~~~~~~~~~~
> > ../drivers/dma/imx-dma.c:288:8: note: in expansion of macro ‘min’
> >   now = min(d->len, sg_dma_len(sg));
> >         ^~~
> >
> > Rework so that we use min_t and pass in the size_t that returns the
> > minimum of two values, using the specified type.
> >
> > Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
>
> There is a typo in the Subject: s/ixm/imx/ and the prefix should be
> dmaengine instead:
>
> dmaengine: imx-dma: fix warning comparison of distinct pointer types
>
> With that fixed:
>
> Reviewed-by: Fabio Estevam <festevam@...il.com>

OK, thanks Fabio.

Dan, do you want me to resend the patch with an updated shortlog or will
you do that when you apply the patch?

Cheers,
Anders