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

[Chen, Rong A]

On 10/31/2022 4:27 PM, Alexander Potapenko wrote:
> Looks unrelated to this 2-year old commit?

Hi Alexander,

Sorry for the inconvenience, the commit here is not the root cause for
this error, we'll add it to ignore list.

Best Regards,
Rong Chen


> On Sun, Oct 30, 2022 at 6:12 PM kernel test robot <lkp@xxxxxxxxx> wrote:
> > 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@xxxxxxxxx>
> >
> > 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@xxxxxxxxxxx>
> > :::::: CC: Paul Mackerras <paulus@xxxxxxxxx>
> >
> > --
> > 0-DAY CI Kernel Test Service
> > https://01.org/lkp