[kbuild-all] arch/powerpc/xmon/xmon.c:3174 show_task() warn: unsigned 'p_state' is never less than zero.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 1746f4db513563bb22e0ba0c419d0c90912dfae1 commit: 2f064a59a11ff9bc22e52e9678bc601404c7cb34 sched: Change task_struct::state date: 8 weeks ago config: powerpc64-randconfig-m031-20210812 (attached as .config) compiler: powerpc-linux-gcc (GCC) 10.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; New smatch warnings: arch/powerpc/xmon/xmon.c:3174 show_task() warn: unsigned 'p_state' is never less than zero. Old smatch warnings: arch/powerpc/include/asm/mmu.h:233 early_mmu_has_feature() warn: bitwise AND condition is false here arch/powerpc/xmon/xmon.c:2798 dump() warn: '"d? vim +/p_state +3174 arch/powerpc/xmon/xmon.c 3162 3163 static void show_task(struct task_struct *tsk) 3164 { 3165 unsigned int p_state = READ_ONCE(tsk->__state); 3166 char state; 3167 3168 /* 3169 * Cloned from kdb_task_state_char(), which is not entirely 3170 * appropriate for calling from xmon. This could be moved 3171 * to a common, generic, routine used by both. 3172 */ 3173 state = (p_state == 0) ? 'R' : 3175 (p_state & TASK_UNINTERRUPTIBLE) ? 'D' : 3176 (p_state & TASK_STOPPED) ? 'T' : 3177 (p_state & TASK_TRACED) ? 'C' : 3178 (tsk->exit_state & EXIT_ZOMBIE) ? 'Z' : 3179 (tsk->exit_state & EXIT_DEAD) ? 'E' : 3180 (p_state & TASK_INTERRUPTIBLE) ? 'S' : '?'; 3181 3182 printf("%16px %16lx %16px %6d %6d %c %2d %s\n", tsk, 3183 tsk->thread.ksp, tsk->thread.regs, 3184 tsk->pid, rcu_dereference(tsk->parent)->pid, 3185 state, task_cpu(tsk), 3186 tsk->comm); 3187 } 3188 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org