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SubjectRe: [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@intel.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@intel.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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