linux-kernel - Re: [RESEND PATCH v2 1/9] iomap: Constify ioreadX() iomem argument (as in generic implementation)

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Message-ID: <87ftedj0zz.fsf@mpe.ellerman.id.au>
Date:   Thu, 12 Mar 2020 21:55:44 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
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>,
        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,
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        virtualization@...ts.linux-foundation.org,
        linux-arch@...r.kernel.org
Cc:     Krzysztof Kozlowski <krzk@...nel.org>
Subject: Re: [RESEND PATCH v2 1/9] iomap: Constify ioreadX() iomem argument (as in generic implementation)

Krzysztof Kozlowski <krzk@...nel.org> writes:
> diff --git a/arch/powerpc/kernel/iomap.c b/arch/powerpc/kernel/iomap.c
> index 5ac84efc6ede..9fe4fb3b08aa 100644
> --- a/arch/powerpc/kernel/iomap.c
> +++ b/arch/powerpc/kernel/iomap.c
> @@ -15,23 +15,23 @@
>   * Here comes the ppc64 implementation of the IOMAP 
>   * interfaces.
>   */
> -unsigned int ioread8(void __iomem *addr)
> +unsigned int ioread8(const void __iomem *addr)
>  {
>  	return readb(addr);
>  }
> -unsigned int ioread16(void __iomem *addr)
> +unsigned int ioread16(const void __iomem *addr)
>  {
>  	return readw(addr);
>  }
> -unsigned int ioread16be(void __iomem *addr)
> +unsigned int ioread16be(const void __iomem *addr)
>  {
>  	return readw_be(addr);
>  }
> -unsigned int ioread32(void __iomem *addr)
> +unsigned int ioread32(const void __iomem *addr)
>  {
>  	return readl(addr);
>  }
> -unsigned int ioread32be(void __iomem *addr)
> +unsigned int ioread32be(const void __iomem *addr)
>  {
>  	return readl_be(addr);
>  }
> @@ -41,27 +41,27 @@ EXPORT_SYMBOL(ioread16be);
>  EXPORT_SYMBOL(ioread32);
>  EXPORT_SYMBOL(ioread32be);
>  #ifdef __powerpc64__
> -u64 ioread64(void __iomem *addr)
> +u64 ioread64(const void __iomem *addr)
>  {
>  	return readq(addr);
>  }
> -u64 ioread64_lo_hi(void __iomem *addr)
> +u64 ioread64_lo_hi(const void __iomem *addr)
>  {
>  	return readq(addr);
>  }
> -u64 ioread64_hi_lo(void __iomem *addr)
> +u64 ioread64_hi_lo(const void __iomem *addr)
>  {
>  	return readq(addr);
>  }
> -u64 ioread64be(void __iomem *addr)
> +u64 ioread64be(const void __iomem *addr)
>  {
>  	return readq_be(addr);
>  }
> -u64 ioread64be_lo_hi(void __iomem *addr)
> +u64 ioread64be_lo_hi(const void __iomem *addr)
>  {
>  	return readq_be(addr);
>  }
> -u64 ioread64be_hi_lo(void __iomem *addr)
> +u64 ioread64be_hi_lo(const void __iomem *addr)
>  {
>  	return readq_be(addr);
>  }
> @@ -139,15 +139,15 @@ EXPORT_SYMBOL(iowrite64be_hi_lo);
>   * FIXME! We could make these do EEH handling if we really
>   * wanted. Not clear if we do.
>   */
> -void ioread8_rep(void __iomem *addr, void *dst, unsigned long count)
> +void ioread8_rep(const void __iomem *addr, void *dst, unsigned long count)
>  {
>  	readsb(addr, dst, count);
>  }
> -void ioread16_rep(void __iomem *addr, void *dst, unsigned long count)
> +void ioread16_rep(const void __iomem *addr, void *dst, unsigned long count)
>  {
>  	readsw(addr, dst, count);
>  }
> -void ioread32_rep(void __iomem *addr, void *dst, unsigned long count)
> +void ioread32_rep(const void __iomem *addr, void *dst, unsigned long count)
>  {
>  	readsl(addr, dst, count);
>  }

This looks OK to me.

Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)

cheers