linux-kernel - Re: [PATCH v7 1/3] phy: mediatek: remove temporary variable @mask

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Message-ID: <e970a634-2d54-4a79-12ec-10da7a2f0e6e@collabora.com>
Date:   Wed, 18 Jan 2023 13:29:52 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Vinod Koul <vkoul@...nel.org>
Cc:     Kishon Vijay Abraham I <kishon@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Eddie Hung <eddie.hung@...iatek.com>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v7 1/3] phy: mediatek: remove temporary variable @mask_

Il 18/01/23 09:43, Chunfeng Yun ha scritto:
> Remove the temporary @mask_, this may cause build warning when use clang
> compiler for powerpc, but can't reproduce it when compile for arm64.
> the build warning is caused by:
> 
> "warning: result of comparison of constant 18446744073709551615 with
> expression of type (aka 'unsigned long') is always false
> [-Wtautological-constant-out-of-range-compare]"
> 
> More information provided in below lore link.
> 
> After removing @mask_, there is a "CHECK:MACRO_ARG_REUSE" when run
> checkpatch.pl, but due to @mask is constant, no reuse problem will happen.
> 
> Link: https://lore.kernel.org/lkml/202212160357.jJuesD8n-lkp@intel.com/t/
> Fixes: 84513eccd678 ("phy: mediatek: fix build warning of FIELD_PREP()")
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>