linux-kernel - Re: [PATCH V8 1/6] clk: imx6sl: Use BIT(x) to avoid shifting signed 32-bit value by 31 bits

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Message-ID: <CAK8P3a000jKRMM9pm72mw5a1xV=NtOT6Z-H2EDS6=5165HMt5w@mail.gmail.com>
Date:   Thu, 30 Jul 2020 09:22:37 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Anson Huang <Anson.Huang@....com>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Dong Aisheng <aisheng.dong@....com>,
        Peng Fan <peng.fan@....com>, Abel Vesa <abel.vesa@....com>,
        Andy Duan <fugang.duan@....com>,
        Daniel Baluta <daniel.baluta@....com>,
        YueHaibing <yuehaibing@...wei.com>,
        linux-clk <linux-clk@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        NXP Linux Team <Linux-imx@....com>
Subject: Re: [PATCH V8 1/6] clk: imx6sl: Use BIT(x) to avoid shifting signed
 32-bit value by 31 bits

On Thu, Jul 30, 2020 at 2:03 AM Anson Huang <Anson.Huang@....com> wrote:
>
> Use readl_relaxed() instead of __raw_readl(), and use BIT(x)
> instead of (1 << X) to fix below build warning reported by kernel
> test robot:
>
> drivers/clk/imx/clk-imx6sl.c:149:49: warning: Shifting signed 32-bit
> value by 31 bits is undefined behaviour [shiftTooManyBitsSigned]
>      while (!(__raw_readl(anatop_base + PLL_ARM) & BM_PLL_ARM_LOCK))
>
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> Reported-by: kernel test robot <lkp@...el.com>

Acked-by: Arnd Bergmann <arnd@...db.de>