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Date:   Thu, 17 Sep 2020 10:19:59 +0300
From:   Gilad Ben-Yossef <gilad@...yossef.com>
To:     kernel test robot <lkp@...el.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>, kbuild-all@...ts.01.org,
        clang-built-linux@...glegroups.com, netdev@...r.kernel.org,
        Ofir Drang <ofir.drang@....com>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] crypto: ccree - add custom cache params from DT file

hmm...

On Wed, Sep 16, 2020 at 4:48 PM kernel test robot <lkp@...el.com> wrote:
>
> url:    https://github.com/0day-ci/linux/commits/Gilad-Ben-Yossef/add-optional-cache-params-from-DT/20200916-152151
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master
> config: arm64-randconfig-r015-20200916 (attached as .config)
> compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 9e3842d60351f986d77dfe0a94f76e4fd895f188)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install arm64 cross compiling tool for clang build
>         # apt-get install binutils-aarch64-linux-gnu
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>):
>
> >> drivers/crypto/ccree/cc_driver.c:120:18: warning: result of comparison of constant 18446744073709551615 with expression of type 'u32' (aka 'unsigned int') is always false [-Wtautological-constant-out-of-range-compare]
>            cache_params |= FIELD_PREP(mask, val);
>                            ^~~~~~~~~~~~~~~~~~~~~
>    include/linux/bitfield.h:94:3: note: expanded from macro 'FIELD_PREP'
>                    __BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_PREP: ");    \
>                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    include/linux/bitfield.h:52:28: note: expanded from macro '__BF_FIELD_CHECK'
>                    BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull,         \
>                    ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
>    #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>                                        ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
>    include/linux/compiler_types.h:319:22: note: expanded from macro 'compiletime_assert'
>            _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>            ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    include/linux/compiler_types.h:307:23: note: expanded from macro '_compiletime_assert'
>            __compiletime_assert(condition, msg, prefix, suffix)
>            ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    include/linux/compiler_types.h:299:9: note: expanded from macro '__compiletime_assert'
>                    if (!(condition))                                       \
>                          ^~~~~~~~~

I am unable to understand this warning. It looks like it is
complaining about a FIELD_GET sanity check that is always false, which
makes sense since we're using a constant.

Anyone can enlighten me if I've missed something?

Thanks,
Gilad



-- 
Gilad Ben-Yossef
Chief Coffee Drinker

values of β will give rise to dom!

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