linux-kernel - Re: arch/mips/mm/tlbex.c:2243:3: warning: unannotated fall-through between switch labels

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Date:   Mon, 22 Nov 2021 18:55:28 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     kernel test robot <lkp@...el.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        Nathan Chancellor <nathan@...nel.org>
Subject: Re: arch/mips/mm/tlbex.c:2243:3: warning: unannotated fall-through
 between switch labels

On Tue, Nov 23, 2021 at 07:51:33AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   136057256686de39cc3a07c2e39ef6bc43003ff6
> commit: dee2b702bcf067d7b6b62c18bdd060ff0810a800 kconfig: Add support for -Wimplicit-fallthrough
> date:   8 days ago
> config: mips-randconfig-r016-20211116 (attached as .config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project fbe72e41b99dc7994daac300d208a955be3e4a0a)
> 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 mips cross compiling tool for clang build
>         # apt-get install binutils-mips-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dee2b702bcf067d7b6b62c18bdd060ff0810a800
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout dee2b702bcf067d7b6b62c18bdd060ff0810a800
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=mips 
> 
> 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 >>):
> 
> >> arch/mips/mm/tlbex.c:2243:3: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
>                    case CPU_CAVIUM_OCTEON:
>                    ^
>    arch/mips/mm/tlbex.c:2243:3: note: insert 'break;' to avoid fall-through
>                    case CPU_CAVIUM_OCTEON:
>                    ^
>                    break; 

I already have a patch for this here:

https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git/commit/?h=for-linus/kspp&id=cd3ed04e7fc365e4e581333c3ff69c8da6ca0e8b

Thanks
--
Gustavo