Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <20200505174423.199985-1-ndesaulniers@google.com>
 <8A776DBC-03AF-485B-9AA6-5920E3C4ACB2@zytor.com> <20200507113422.GA3762@hirez.programming.kicks-ass.net>
 <CAMzpN2hXUYvLuTA63N56ef4DEzyWXt_uVVq6PV0r8YQT-YN42g@mail.gmail.com>
In-Reply-To: <CAMzpN2hXUYvLuTA63N56ef4DEzyWXt_uVVq6PV0r8YQT-YN42g@mail.gmail.com>
From:   Nick Desaulniers <ndesaulniers@google.com>
Date:   Thu, 7 May 2020 12:19:30 -0700
Message-ID: <CAKwvOd=a3MR7osKBpbq=d41ieo7G9FtOp5Kok5por1P5ZS9s4g@mail.gmail.com>
Subject: Re: [PATCH] x86: bitops: fix build regression
To:     Brian Gerst <brgerst@gmail.com>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Sedat Dilek <sedat.dilek@gmail.com>,
        stable <stable@vger.kernel.org>,
        Jesse Brandeburg <jesse.brandeburg@intel.com>,
        "kernelci . org bot" <bot@kernelci.org>,
        Andy Shevchenko <andriy.shevchenko@intel.com>,
        Ilie Halip <ilie.halip@gmail.com>,
        "the arch/x86 maintainers" <x86@kernel.org>,
        Marco Elver <elver@google.com>,
        "Paul E. McKenney" <paulmck@kernel.org>,
        Daniel Axtens <dja@axtens.net>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        clang-built-linux <clang-built-linux@googlegroups.com>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Thu, May 7, 2020 at 7:00 AM Brian Gerst <brgerst@gmail.com> wrote:
>
> This change will make sparse happy and allow these cleanups:
> #define CONST_MASK(nr)                 ((u8)1 << ((nr) & 7))

yep, this is more elegant, IMO.  Will send a v3 later with this
change.  Looking at the uses of CONST_MASK, I noticed
arch_change_bit() currently has the (u8) cast from commit
838e8bb71dc0c ("x86: Implement change_bit with immediate operand as
"lock xorb""), so that instance can get cleaned up with the above
suggestion.

-- 
Thanks,
~Nick Desaulniers