tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: da2968ff879b9e74688cdc658f646971991d2c56 commit: b344d6a83d01c52fddbefa6b3b4764da5b1022a0 parisc: add support for cmpxchg on u8 pointers date: 4 weeks ago config: parisc-randconfig-s032-20200820 (attached as .config) compiler: hppa-linux-gcc (GCC) 9.3.0 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: v0.6.2-191-g10164920-dirty git checkout b344d6a83d01c52fddbefa6b3b4764da5b1022a0 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=parisc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) fs/erofs/utils.c: note: in included file (through arch/parisc/include/asm/atomic.h, include/linux/atomic.h, arch/parisc/include/asm/bitops.h, ...): -- fs/erofs/zdata.c: note: in included file (through arch/parisc/include/asm/atomic.h, include/linux/atomic.h, arch/parisc/include/asm/bitops.h, ...): arch/parisc/include/asm/cmpxchg.h:75:52: sparse: sparse: cast truncates bits from constant value (5f0ecafe becomes fe) arch/parisc/include/asm/cmpxchg.h:75:52: sparse: sparse: cast truncates bits from constant value (5f0ecafe becomes fe) arch/parisc/include/asm/cmpxchg.h:75:61: sparse: sparse: cast truncates bits from constant value (5f0edead becomes ad) # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout b344d6a83d01c52fddbefa6b3b4764da5b1022a0 vim +75 arch/parisc/include/asm/cmpxchg.h 64 65 /* don't worry...optimizer will get rid of most of this */ 66 static inline unsigned long 67 __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size) 68 { 69 switch (size) { 70 #ifdef CONFIG_64BIT 71 case 8: return __cmpxchg_u64((u64 *)ptr, old, new_); 72 #endif 73 case 4: return __cmpxchg_u32((unsigned int *)ptr, 74 (unsigned int)old, (unsigned int)new_); 76 } 77 __cmpxchg_called_with_bad_pointer(); 78 return old; 79 } 80 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org