[Crash-utility] What should "list -h" be doing?

Hi, I think the behaviour of the (undocumented) "list -h" command is hardly useful. I believe the intention was to cover cases like struct anon_vma, which is linked through a list_head (not at the beginning of the structure) and does not have an external struct list_head. However, it doesn't work for that case: crash> struct -o anon_vma struct anon_vma { [0x0] struct anon_vma *root; [0x4] spinlock_t lock; [0x8] atomic_t external_refcount; [0xc] struct list_head head; } Now, let's have an anon_vma at 0xf0749d38 crash> anon_vma 0xf0749d38 struct anon_vma { root = 0xf0749d38, /* left out for brevity */ head = { next = 0xf6c34708, prev = 0xf6c34d80 } } I would assume that I can walk all linked anon_vma's with list -o anon_vma.head -h 0xf0749d38 But that still expects a pointer to struct list_head. I would have to do list -o anon_vma.head -h 0xf0749d38+0xc That's awkward. But maybe it's how it should work, because it's not clear what the "-h" should be doing. Anyway, I think the "list" command could help with walking the anon_vma list. I can surely add another option letter for that purpose, but before doing that, I'd like to ask if this is merely missing documentation and a bug in the implemenatation of the existing "-h" option. Thanks for your patience, Petr Tesarik