tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 509583475828c4fd86897113f78315c1431edcc3 commit: 6246541522845a443b7ae4a8f0e16facc5a91198 [9401/13217] locking/atomic: cmpxchg: Make __generic_cmpxchg_local compare against zero-extended 'old' value config: nios2-randconfig-s032-20230212 (https://download.01.org/0day-ci/archive/20230217/202302170355.Ljqlzucu-lkp@xxxxxxxxx/config) compiler: nios2-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/next/linux-next.git/commit/?id=6246541522845a443b7ae4a8f0e16facc5a91198 git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 6246541522845a443b7ae4a8f0e16facc5a91198 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=nios2 olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=nios2 SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Link: https://lore.kernel.org/oe-kbuild-all/202302170355.Ljqlzucu-lkp@xxxxxxxxx/ sparse warnings: (new ones prefixed by >>) lib/atomic64_test.c: note: in included file (through arch/nios2/include/generated/asm/cmpxchg.h, include/asm-generic/atomic.h, arch/nios2/include/generated/asm/atomic.h, ...): include/asm-generic/cmpxchg.h:35:39: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) include/asm-generic/cmpxchg.h:46:40: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) include/asm-generic/cmpxchg.h:35:39: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) include/asm-generic/cmpxchg.h:46:40: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) include/asm-generic/cmpxchg.h:35:39: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) include/asm-generic/cmpxchg.h:46:40: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) include/asm-generic/cmpxchg.h:35:39: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) include/asm-generic/cmpxchg.h:46:40: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) lib/atomic64_test.c: note: in included file (through include/asm-generic/cmpxchg.h, arch/nios2/include/generated/asm/cmpxchg.h, include/asm-generic/atomic.h, ...): >> include/asm-generic/cmpxchg-local.h:29:33: sparse: sparse: cast truncates bits from constant value (aaa31337 becomes 37) include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) include/asm-generic/cmpxchg-local.h:33:34: sparse: sparse: cast truncates bits from constant value (aaa31337 becomes 1337) include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) >> include/asm-generic/cmpxchg-local.h:29:33: sparse: sparse: cast truncates bits from constant value (aaa31337 becomes 37) include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) include/asm-generic/cmpxchg-local.h:33:34: sparse: sparse: cast truncates bits from constant value (aaa31337 becomes 1337) include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) >> include/asm-generic/cmpxchg-local.h:29:33: sparse: sparse: cast truncates bits from constant value (aaa31337 becomes 37) include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) include/asm-generic/cmpxchg-local.h:33:34: sparse: sparse: cast truncates bits from constant value (aaa31337 becomes 1337) include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) >> include/asm-generic/cmpxchg-local.h:29:33: sparse: sparse: cast truncates bits from constant value (aaa31337 becomes 37) include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) include/asm-generic/cmpxchg-local.h:33:34: sparse: sparse: cast truncates bits from constant value (aaa31337 becomes 1337) include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) >> include/asm-generic/cmpxchg-local.h:29:33: sparse: sparse: cast truncates bits from constant value (11112222 becomes 22) include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) include/asm-generic/cmpxchg-local.h:33:34: sparse: sparse: cast truncates bits from constant value (11112222 becomes 2222) include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) >> include/asm-generic/cmpxchg-local.h:29:33: sparse: sparse: cast truncates bits from constant value (11112222 becomes 22) include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) include/asm-generic/cmpxchg-local.h:33:34: sparse: sparse: cast truncates bits from constant value (11112222 becomes 2222) include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) >> include/asm-generic/cmpxchg-local.h:29:33: sparse: sparse: cast truncates bits from constant value (11112222 becomes 22) include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) include/asm-generic/cmpxchg-local.h:33:34: sparse: sparse: cast truncates bits from constant value (11112222 becomes 2222) include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) >> include/asm-generic/cmpxchg-local.h:29:33: sparse: sparse: cast truncates bits from constant value (11112222 becomes 22) include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef) include/asm-generic/cmpxchg-local.h:33:34: sparse: sparse: cast truncates bits from constant value (11112222 becomes 2222) include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef) vim +29 include/asm-generic/cmpxchg-local.h 7 8 extern unsigned long wrong_size_cmpxchg(volatile void *ptr) 9 __noreturn; 10 11 /* 12 * Generic version of __cmpxchg_local (disables interrupts). Takes an unsigned 13 * long parameter, supporting various types of architectures. 14 */ 15 static inline unsigned long __generic_cmpxchg_local(volatile void *ptr, 16 unsigned long old, unsigned long new, int size) 17 { 18 unsigned long flags, prev; 19 20 /* 21 * Sanity checking, compile-time. 22 */ 23 if (size == 8 && sizeof(unsigned long) != 8) 24 wrong_size_cmpxchg(ptr); 25 26 raw_local_irq_save(flags); 27 switch (size) { 28 case 1: prev = *(u8 *)ptr; > 29 if (prev == (u8)old) 30 *(u8 *)ptr = (u8)new; 31 break; 32 case 2: prev = *(u16 *)ptr; 33 if (prev == (u16)old) 34 *(u16 *)ptr = (u16)new; 35 break; 36 case 4: prev = *(u32 *)ptr; 37 if (prev == (u32)old) 38 *(u32 *)ptr = (u32)new; 39 break; 40 case 8: prev = *(u64 *)ptr; 41 if (prev == old) 42 *(u64 *)ptr = (u64)new; 43 break; 44 default: 45 wrong_size_cmpxchg(ptr); 46 } 47 raw_local_irq_restore(flags); 48 return prev; 49 } 50 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
