linux-kernel - Re: [PATCH v6 1/2] x86: fix bitops.h warning with a moved cast

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Message-ID: <20200311043726.kqdshlteaz27c2jn@ltop.local>
Date:   Wed, 11 Mar 2020 05:37:26 +0100
From:   Luc Van Oostenryck <luc.vanoostenryck@...il.com>
To:     Jesse Brandeburg <jesse.brandeburg@...el.com>
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux@...musvillemoes.dk,
        andriy.shevchenko@...el.com, dan.j.williams@...el.com,
        peterz@...radead.org
Subject: Re: [PATCH v6 1/2] x86: fix bitops.h warning with a moved cast

On Tue, Mar 10, 2020 at 03:17:46PM -0700, Jesse Brandeburg wrote:
> Fix many sparse warnings when building with C=1. These are useless
> noise from the bitops.h file and getting rid of them helps devs
> make more use of the tools and possibly find real bugs.
> 
> When the kernel is compiled with C=1, there are lots of messages like:
>   arch/x86/include/asm/bitops.h:77:37: warning: cast truncates bits from constant value (ffffff7f becomes 7f)

Acked-by: Luc Van Oostenryck <luc.vanoostenryck@...il.com>