[Crash-utility] Fix bug of list -h

Hello Dave, When investigating list command, I found the "-h" is involved but not discussed in help page. And then I tried to use, but I find some problems with it. The first, I made patch to show it. The "ld->start" should be the pointer to the structure list_head. And the second one, I am not sure about the reason why you don't display the node related to the address user input. I will take the tasks of task_struct as an example. crash> task_struct.tasks ffff8800371a0ac0 tasks = { next = 0xffffffff81a8d468, prev = 0xffff88004a9e0f88 } crash> list task_struct.tasks -s task_struct.tasks -h ffff8800371a0ac0 ffffffff81a8d020 tasks = { next = 0xffff88004eaf1908, prev = 0xffff8800371a0f08 } ffff88004eaf14c0 tasks = { next = 0xffff88004eaf0ec8, prev = 0xffffffff81a8d468 } ... As the command shows, the command neglect the task_struct at ffff8800371a0ac0. I don't know why it is omitted. And if only one node is in the list, why prints "(empty)"? readmem(ld->start, KVADDR, &ld->start, sizeof(void *), "LIST_HEAD contents", FAULT_ON_ERROR); if (ld->start == ld->end) { fprintf(fp, "(empty)\n"); return; } -- -- Regards Qiao Nuohan