linux-kernel - Re: [PATCH 14/23] memory: ti-emif-pm: Fix cast to iomem pointer

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Date:   Thu, 23 Jul 2020 10:48:19 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Olof Johansson <olof@...om.net>, arm-soc <arm@...nel.org>,
        SoC Team <soc@...nel.org>, Markus Mayer <mmayer@...adcom.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Roger Quadros <rogerq@...com>,
        Tony Lindgren <tony@...mide.com>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC..." 
        <linux-mediatek@...ts.infradead.org>,
        linux-omap <linux-omap@...r.kernel.org>,
        "open list:TEGRA ARCHITECTURE SUPPORT" <linux-tegra@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 14/23] memory: ti-emif-pm: Fix cast to iomem pointer

On Thu, Jul 23, 2020 at 9:39 AM Krzysztof Kozlowski <krzk@...nel.org> wrote:
>
> Cast pointer to iomem memory properly to fix sparse warning:
>
>     drivers/memory/ti-emif-pm.c:251:38: warning: incorrect type in argument 1 (different address spaces)
>     drivers/memory/ti-emif-pm.c:251:38:    expected void const volatile [noderef] __iomem *addr
>     drivers/memory/ti-emif-pm.c:251:38:    got void *
>
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> ---
>  drivers/memory/ti-emif-pm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/memory/ti-emif-pm.c b/drivers/memory/ti-emif-pm.c
> index 9c90f815ad3a..6c747c1e98cb 100644
> --- a/drivers/memory/ti-emif-pm.c
> +++ b/drivers/memory/ti-emif-pm.c
> @@ -248,7 +248,7 @@ MODULE_DEVICE_TABLE(of, ti_emif_of_match);
>  static int ti_emif_resume(struct device *dev)
>  {
>         unsigned long tmp =
> -                       __raw_readl((void *)emif_instance->ti_emif_sram_virt);
> +                       __raw_readl((void __iomem *)emif_instance->ti_emif_sram_virt);
>

Maybe this shouldn't even be __raw_readl(), but instead READ_ONCE()?

The other accesses in this file don't use MMIO wrappers either but just treat
it as a pointer. The effect would be the same though.

      Arnd