linux-kernel - Re: [PATCH] pinctrl: samsung: use 'int' for register masks in Exynos

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Date:   Sat, 10 Apr 2021 02:07:26 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Tomasz Figa <tomasz.figa@...il.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH] pinctrl: samsung: use 'int' for register masks in Exynos

On Thu, Apr 8, 2021 at 9:50 PM Krzysztof Kozlowski
<krzysztof.kozlowski@...onical.com> wrote:

> The Special Function Registers on all Exynos SoC, including ARM64, are
> 32-bit wide, so entire driver uses matching functions like readl() or
> writel().  On 64-bit ARM using unsigned long for register masks:
> 1. makes little sense as immediately after bitwise operation it will be
>    cast to 32-bit value when calling writel(),
> 2. is actually error-prone because it might promote other operands to
>    64-bit.
>
> Addresses-Coverity: Unintentional integer overflow
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
(...)
> Please apply it directly, I don't have any patches for Samsung pinctrl
> in my tree.

OK! Patch applied!

Yours,
Linus Walleij