linux-kernel - arch/powerpc/kexec/crash.c:311:22: error: variable 'i' might be clobbered by 'longjmp' or 'vfork'

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Date:   Mon, 31 Oct 2022 01:11:52 +0800
From:   kernel test robot <lkp@...el.com>
To:     glider <glider@...gle.com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>,
        Maciej Żenczykowski <maze@...gle.com>
Subject: arch/powerpc/kexec/crash.c:311:22: error: variable 'i' might be
 clobbered by 'longjmp' or 'vfork'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   882ad2a2a8ffa1defecdf907052f04da2737dc46
commit: f0fe00d4972a8cd4b98cc2c29758615e4d51cdfe security: allow using Clang's zero initialization for stack variables
date:   2 years, 4 months ago
config: powerpc-wii_defconfig
compiler: powerpc-linux-gcc (GCC) 12.1.0
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f0fe00d4972a8cd4b98cc2c29758615e4d51cdfe
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout f0fe00d4972a8cd4b98cc2c29758615e4d51cdfe
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   arch/powerpc/kexec/crash.c: In function 'default_machine_crash_shutdown':
>> arch/powerpc/kexec/crash.c:311:22: error: variable 'i' might be clobbered by 'longjmp' or 'vfork' [-Werror=clobbered]
     311 |         unsigned int i;
         |                      ^
   cc1: all warnings being treated as errors


vim +311 arch/powerpc/kexec/crash.c

496b010e1e70a9 arch/powerpc/kernel/crash.c Michael Neuling  2008-01-18  308  
cc53291521701f arch/powerpc/kernel/crash.c Michael Ellerman 2005-12-04  309  void default_machine_crash_shutdown(struct pt_regs *regs)
cc53291521701f arch/powerpc/kernel/crash.c Michael Ellerman 2005-12-04  310  {
496b010e1e70a9 arch/powerpc/kernel/crash.c Michael Neuling  2008-01-18 @311  	unsigned int i;

:::::: The code at line 311 was first introduced by commit
:::::: 496b010e1e70a9b4286fa34f19523f24a194f119 [POWERPC] kdump shutdown hook support

:::::: TO: Michael Neuling <mikey@...ling.org>
:::::: CC: Paul Mackerras <paulus@...ba.org>

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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