linux-kernel - Re: [RESEND PATCH v2 8/9] media: fsl-viu: Constify ioreadX() iomem argument (as in generic implementation)

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Message-ID: <1c4a11b5-5ca6-7555-de3c-ff30f707fac7@xs4all.nl>
Date:   Thu, 12 Mar 2020 09:01:22 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Alexey Brodkin <abrodkin@...opsys.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Dave Airlie <airlied@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Ben Skeggs <bskeggs@...hat.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Jiri Slaby <jirislaby@...il.com>,
        Nick Kossifidis <mickflemm@...il.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Dave Jiang <dave.jiang@...el.com>,
        Jon Mason <jdmason@...zu.us>, Allen Hubbe <allenbh@...il.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-snps-arc@...ts.infradead.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-sh@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        linux-media@...r.kernel.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-ntb@...glegroups.com,
        virtualization@...ts.linux-foundation.org,
        linux-arch@...r.kernel.org
Subject: Re: [RESEND PATCH v2 8/9] media: fsl-viu: Constify ioreadX() iomem
 argument (as in generic implementation)

On 2/19/20 6:50 PM, Krzysztof Kozlowski wrote:
> The ioreadX() helpers have inconsistent interface.  On some architectures
> void *__iomem address argument is a pointer to const, on some not.
> 
> Implementations of ioreadX() do not modify the memory under the address
> so they can be converted to a "const" version for const-safety and
> consistency among architectures.
> 
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>

Acked-by: Hans Verkuil <hverkuil-cisco@...all.nl>

Regards,

	Hans

> ---
>  drivers/media/platform/fsl-viu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/fsl-viu.c b/drivers/media/platform/fsl-viu.c
> index 81a8faedbba6..991d9dc82749 100644
> --- a/drivers/media/platform/fsl-viu.c
> +++ b/drivers/media/platform/fsl-viu.c
> @@ -34,7 +34,7 @@
>  /* Allow building this driver with COMPILE_TEST */
>  #if !defined(CONFIG_PPC) && !defined(CONFIG_MICROBLAZE)
>  #define out_be32(v, a)	iowrite32be(a, (void __iomem *)v)
> -#define in_be32(a)	ioread32be((void __iomem *)a)
> +#define in_be32(a)	ioread32be((const void __iomem *)a)
>  #endif
>  
>  #define BUFFER_TIMEOUT		msecs_to_jiffies(500)  /* 0.5 seconds */
>