Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
References: <20190110111535.11235-1-anders.roxell@linaro.org>
In-Reply-To: <20190110111535.11235-1-anders.roxell@linaro.org>
From:   Fabio Estevam <festevam@gmail.com>
Date:   Mon, 14 Jan 2019 19:24:29 -0200
Message-ID: <CAOMZO5DGxXBCFbLgqeophv_Jw2nO5wiPXJXuth6CPEfSr9f9=w@mail.gmail.com>
Subject: Re: [PATCH] dma: ixm-dma: fix warning comparison of distinct pointer types
To:     Anders Roxell <anders.roxell@linaro.org>
Cc:     Vinod <vkoul@kernel.org>, Dan Williams <dan.j.williams@intel.com>,
        dmaengine@vger.kernel.org,
        linux-kernel <linux-kernel@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hi Anders,

On Thu, Jan 10, 2019 at 9:15 AM Anders Roxell <anders.roxell@linaro.org> wr=
ote:
>
> 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 =E2=80=98imxdma_sg_next=E2=80=99:
> ../include/linux/kernel.h:846:29: warning: comparison of distinct pointer=
 types lacks a cast
>    (!!(sizeof((typeof(x) *)1 =3D=3D (typeof(y) *)1)))
>                              ^~
> ../include/linux/kernel.h:860:4: note: in expansion of macro =E2=80=98__t=
ypecheck=E2=80=99
>    (__typecheck(x, y) && __no_side_effects(x, y))
>     ^~~~~~~~~~~
> ../include/linux/kernel.h:870:24: note: in expansion of macro =E2=80=98__=
safe_cmp=E2=80=99
>   __builtin_choose_expr(__safe_cmp(x, y), \
>                         ^~~~~~~~~~
> ../include/linux/kernel.h:879:19: note: in expansion of macro =E2=80=98__=
careful_cmp=E2=80=99
>  #define min(x, y) __careful_cmp(x, y, <)
>                    ^~~~~~~~~~~~~
> ../drivers/dma/imx-dma.c:288:8: note: in expansion of macro =E2=80=98min=
=E2=80=99
>   now =3D 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@linaro.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@gmail.com>