tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: e922ba281a8d84f640d8c8e18a385d032c19e185 commit: 7106f5ae4745c65b29d34ec825f9a83e85dd8f8a [946/2056] mm: kfence: fix false positives on big endian config: riscv-randconfig-s053-20230510 (https://download.01.org/0day-ci/archive/20230513/202305132244.DwzBUcUd-lkp@xxxxxxxxx/config) compiler: riscv64-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=7106f5ae4745c65b29d34ec825f9a83e85dd8f8a 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 7106f5ae4745c65b29d34ec825f9a83e85dd8f8a # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=riscv olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=riscv SHELL=/bin/bash mm/kfence/ 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/202305132244.DwzBUcUd-lkp@xxxxxxxxx/ sparse warnings: (new ones prefixed by >>) WARNING: invalid argument to '-march': '_zihintpause' >> mm/kfence/core.c:329:34: sparse: sparse: cast to restricted __le64 mm/kfence/core.c:333:34: sparse: sparse: cast to restricted __le64 mm/kfence/core.c:352:21: sparse: sparse: cast to restricted __le64 mm/kfence/core.c:372:21: sparse: sparse: cast to restricted __le64 mm/kfence/core.c:1181:9: sparse: sparse: context imbalance in 'kfence_handle_page_fault' - different lock contexts for basic block vim +329 mm/kfence/core.c 0ce20dd840897b Alexander Potapenko 2021-02-25 318 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 319 static inline void set_canary(const struct kfence_metadata *meta) 0ce20dd840897b Alexander Potapenko 2021-02-25 320 { 0ce20dd840897b Alexander Potapenko 2021-02-25 321 const unsigned long pageaddr = ALIGN_DOWN(meta->addr, PAGE_SIZE); 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 322 unsigned long addr = pageaddr; 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 323 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 324 /* 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 325 * The canary may be written to part of the object memory, but it does 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 326 * not affect it. The user should initialize the object before using it. 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 327 */ 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 328 for (; addr < meta->addr; addr += sizeof(u64)) 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 @329 *((u64 *)addr) = KFENCE_CANARY_PATTERN_U64; 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 330 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 331 addr = ALIGN_DOWN(meta->addr + meta->size, sizeof(u64)); 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 332 for (; addr - pageaddr < PAGE_SIZE; addr += sizeof(u64)) 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 333 *((u64 *)addr) = KFENCE_CANARY_PATTERN_U64; 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 334 } 1ba3cbf3ec3b21 Peng Zhang 2023-04-03 335 :::::: The code at line 329 was first introduced by commit :::::: 1ba3cbf3ec3b21d866436fb46b4bb7bdc38608f9 mm: kfence: improve the performance of __kfence_alloc() and __kfence_free() :::::: TO: Peng Zhang <zhangpeng.00@xxxxxxxxxxxxx> :::::: CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
