linux-kernel - Re: [PATCH v2] x86/cpu: replacing the open-coded shift with BIT(x)

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Message-ID: <CAHmME9rNE-fWcdJer-MsQJ224redaXJO-Vvcjy6xg0_Eib-RZQ@mail.gmail.com>
Date:   Tue, 1 Nov 2022 14:43:27 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     cuigaosheng <cuigaosheng1@...wei.com>
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        puwen@...on.cn, TonyWWang-oc@...oxin.com, peterz@...radead.org,
        gregkh@...uxfoundation.org, andrew.cooper3@...rix.com,
        tony.luck@...el.com, mario.limonciello@....com,
        pawan.kumar.gupta@...ux.intel.com, chenyi.qiang@...el.com,
        rdunlap@...radead.org, jithu.joseph@...el.com,
        rafael.j.wysocki@...el.com, paulmck@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] x86/cpu: replacing the open-coded shift with BIT(x)

On Tue, Nov 1, 2022 at 2:37 PM cuigaosheng <cuigaosheng1@...wei.com> wrote:
> > 215 [ 0.953146][ T0] UBSAN: shift-out-of-bounds in mm/shmem.c:3749:18
> > 216 [ 0.953863][ T0] left shift of 1 by 31 places cannot be represented in type 'int'

Isn't this just an issue with `1 << 31` needing to be `1U << 31`?

Jason