linux-kernel - Re: [PATCH 6/7] spi: cadence-quadspi: Wait at least 500 ms for direct reads

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Date:   Tue, 5 Jan 2021 11:41:25 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Pratyush Yadav <p.yadav@...com>
Cc:     kernel test robot <lkp@...el.com>, Mark Brown <broonie@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>, kbuild-all@...ts.01.org,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        linux-spi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/7] spi: cadence-quadspi: Wait at least 500 ms for direct reads

On Tue, Dec 29, 2020 at 1:18 AM 'Pratyush Yadav' via Clang Built Linux
<clang-built-linux@...glegroups.com> wrote:
>
> On 29/12/20 11:29AM, kernel test robot wrote:
> > Hi Pratyush,
> >
> > Thank you for the patch! Perhaps something to improve:
> >
> > [auto build test WARNING on spi/for-next]
> > [also build test WARNING on v5.11-rc1 next-20201223]
> > [If your patch is applied to the wrong git tree, kindly drop us a note.
> > And when submitting patch, we suggest to use '--base' as documented in
> > https://git-scm.com/docs/git-format-patch]
> >
> > url:    https://github.com/0day-ci/linux/commits/Pratyush-Yadav/spi-cadence-quadspi-Add-Octal-DTR-support/20201223-025328
> > base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next
> > config: arm-randconfig-r006-20201221 (attached as .config)
> > compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project cee1e7d14f4628d6174b33640d502bff3b54ae45)
> > 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 arm cross compiling tool for clang build
> >         # apt-get install binutils-arm-linux-gnueabi
> >         # https://github.com/0day-ci/linux/commit/04a7bcbc449363e5d6f498376c69116567b49d7d
> >         git remote add linux-review https://github.com/0day-ci/linux
> >         git fetch --no-tags linux-review Pratyush-Yadav/spi-cadence-quadspi-Add-Octal-DTR-support/20201223-025328
> >         git checkout 04a7bcbc449363e5d6f498376c69116567b49d7d
> >         # save the attached .config to linux build tree
> >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm
> >
> > 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/spi/spi-cadence-quadspi.c:966:24: warning: comparison of distinct pointer types ('typeof (len) *' (aka 'unsigned int *') and 'typeof (500UL) *' (aka 'unsigned long *')) [-Wcompare-distinct-pointer-types]
> >                                             msecs_to_jiffies(max(len, 500UL)))) {
> >                                                              ^~~~~~~~~~~~~~~
> >    include/linux/minmax.h:58:19: note: expanded from macro 'max'
> >    #define max(x, y)       __careful_cmp(x, y, >)
> >                            ^~~~~~~~~~~~~~~~~~~~~~
> >    include/linux/minmax.h:42:24: note: expanded from macro '__careful_cmp'
> >            __builtin_choose_expr(__safe_cmp(x, y), \
> >                                  ^~~~~~~~~~~~~~~~
> >    include/linux/minmax.h:32:4: note: expanded from macro '__safe_cmp'
> >                    (__typecheck(x, y) && __no_side_effects(x, y))
> >                     ^~~~~~~~~~~~~~~~~
> >    include/linux/minmax.h:18:28: note: expanded from macro '__typecheck'
> >            (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
> >                       ~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~
> >    1 warning generated.
>
> On arm64 size_t is defined as unsigned long and on arm is it defined as
> unsigned int. So using 500U would generate the same warning on 64-bit
> platforms. Maybe the fix is to do something like: max(len, (size_t)500).
> Any better ideas?

SGTM

-- 
Thanks,
~Nick Desaulniers