linux-kernel - Re: x86/csum: Remove unnecessary odd handling

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Date:   Sat, 23 Sep 2023 09:05:10 -0500
From:   Noah Goldstein <goldstein.w.n@...il.com>
To:     kernel test robot <lkp@...el.com>
Cc:     x86@...nel.org, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org, edumazet@...gle.com,
        tglx@...utronix.de, mingo@...hat.com,
        torvalds@...ux-foundation.org, bp@...en8.de,
        dave.hansen@...ux.intel.com, David.Laight@...lab.com, hpa@...or.com
Subject: Re: x86/csum: Remove unnecessary odd handling

On Fri, Sep 22, 2023 at 10:25 PM kernel test robot <lkp@...el.com> wrote:
>
> Hi Noah,
>
> kernel test robot noticed the following build warnings:
>
> [auto build test WARNING on tip/x86/core]
> [also build test WARNING on tip/master tip/auto-latest linus/master v6.6-rc2 next-20230921]
> [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#_base_tree_information]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Noah-Goldstein/x86-csum-Remove-unnecessary-odd-handling/20230921-032450
> base:   tip/x86/core
> patch link:    https://lore.kernel.org/r/20230920192300.3772199-1-goldstein.w.n%40gmail.com
> patch subject: x86/csum: Remove unnecessary odd handling
> config: x86_64-randconfig-121-20230921 (https://download.01.org/0day-ci/archive/20230923/202309231130.ZI5MdlDc-lkp@intel.com/config)
> compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230923/202309231130.ZI5MdlDc-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202309231130.ZI5MdlDc-lkp@intel.com/
>
> sparse warnings: (new ones prefixed by >>)
> >> arch/x86/lib/csum-partial_64.c:16:45: sparse: sparse: incorrect type in return expression (different base types) @@     expected restricted __wsum @@     got unsigned long long @@
>    arch/x86/lib/csum-partial_64.c:16:45: sparse:     expected restricted __wsum
>    arch/x86/lib/csum-partial_64.c:16:45: sparse:     got unsigned long long
> >> arch/x86/lib/csum-partial_64.c:16:45: sparse: sparse: incorrect type in return expression (different base types) @@     expected restricted __wsum @@     got unsigned long long @@
>    arch/x86/lib/csum-partial_64.c:16:45: sparse:     expected restricted __wsum
>    arch/x86/lib/csum-partial_64.c:16:45: sparse:     got unsigned long long
>
> vim +16 arch/x86/lib/csum-partial_64.c
>
>     13
>     14  static inline __wsum csum_finalize_sum(u64 temp64)
>     15  {
>   > 16          return (temp64 + ror64(temp64, 32)) >> 32;
>     17  }
>     18

Just needs a `(__wsum)` cast. Should I post a new patch?
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki