Messages in this thread | | | Date | Wed, 12 Apr 2023 20:23:05 +0800 | From | Philip Li <> | Subject | Re: [tip:locking/rcuref 2/2] arch/sparc/include/asm/cmpxchg_64.h:161:55: sparse: sparse: cast truncates bits from constant value (ffffffffe0000000 becomes 0) |
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On Wed, Apr 12, 2023 at 07:54:59PM +0800, kernel test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking/rcuref > head: ee1ee6db07795d9637bc5e8993a8ddcf886541ef > commit: ee1ee6db07795d9637bc5e8993a8ddcf886541ef [2/2] atomics: Provide rcuref - scalable reference counting > config: sparc-randconfig-s053-20230409 (https://download.01.org/0day-ci/archive/20230412/202304121909.hsRwqwP8-lkp@intel.com/config) > compiler: sparc64-linux-gcc (GCC) 12.1.0 > reproduce: > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # apt-get install sparse > # sparse version: v0.6.4-39-gce1a6720-dirty > # https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=ee1ee6db07795d9637bc5e8993a8ddcf886541ef > git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git > git fetch --no-tags tip locking/rcuref > git checkout ee1ee6db07795d9637bc5e8993a8ddcf886541ef > # save the config file > mkdir build_dir && cp config build_dir/.config > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc olddefconfig > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc SHELL=/bin/bash > > If you fix the issue, kindly add following tag where applicable > | Reported-by: kernel test robot <lkp@intel.com> > | Link: https://lore.kernel.org/oe-kbuild-all/202304121909.hsRwqwP8-lkp@intel.com/ > > sparse warnings: (new ones prefixed by >>) > lib/rcuref.c: note: in included file (through arch/sparc/include/asm/cmpxchg.h, arch/sparc/include/asm/atomic_64.h, arch/sparc/include/asm/atomic.h, ...): > >> arch/sparc/include/asm/cmpxchg_64.h:161:55: sparse: sparse: cast truncates bits from constant value (ffffffffe0000000 becomes 0)
Kindly ignore this, which is a duplication to the input at https://lore.kernel.org/oe-kbuild-all/87k000kuca.ffs@tglx/.
We will update the robot to avoid sending the report against this change.
Thanks
> > vim +161 arch/sparc/include/asm/cmpxchg_64.h > > d550bbd40c0e10 David Howells 2012-03-28 155 > d550bbd40c0e10 David Howells 2012-03-28 156 static inline unsigned long > d550bbd40c0e10 David Howells 2012-03-28 157 __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size) > d550bbd40c0e10 David Howells 2012-03-28 158 { > d550bbd40c0e10 David Howells 2012-03-28 159 switch (size) { > a12ee2349312d7 Babu Moger 2017-05-24 160 case 1: > a12ee2349312d7 Babu Moger 2017-05-24 @161 return __cmpxchg_u8(ptr, old, new); > d550bbd40c0e10 David Howells 2012-03-28 162 case 4: > d550bbd40c0e10 David Howells 2012-03-28 163 return __cmpxchg_u32(ptr, old, new); > d550bbd40c0e10 David Howells 2012-03-28 164 case 8: > d550bbd40c0e10 David Howells 2012-03-28 165 return __cmpxchg_u64(ptr, old, new); > d550bbd40c0e10 David Howells 2012-03-28 166 } > d550bbd40c0e10 David Howells 2012-03-28 167 __cmpxchg_called_with_bad_pointer(); > d550bbd40c0e10 David Howells 2012-03-28 168 return old; > d550bbd40c0e10 David Howells 2012-03-28 169 } > d550bbd40c0e10 David Howells 2012-03-28 170 > > :::::: The code at line 161 was first introduced by commit > :::::: a12ee2349312d7112b9b7c6ac2e70c5ec2ca334e arch/sparc: Introduce cmpxchg_u8 SPARC > > :::::: TO: Babu Moger <babu.moger@oracle.com> > :::::: CC: David S. Miller <davem@davemloft.net> > > -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests >
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