Re: [dm-devel] [PATCH v7 01/16] hashtable: introduce a small and naive hashtable

[Sasha Levin <levinsasha928 gmail com>]

On Mon, Oct 29, 2012 at 7:29 AM, Mathieu Desnoyers
<mathieu desnoyers efficios com> wrote:
> * Sasha Levin (levinsasha928 gmail com) wrote:
>> +
>> +     for (i = 0; i < sz; i++)
>> +             INIT_HLIST_HEAD(&ht[sz]);
>
> ouch. How did this work ? Has it been tested at all ?
>
> sz -> i

Funny enough, it works perfectly. Generally as a test I boot the
kernel in a VM and let it fuzz with trinity for a bit, doing that with
the code above worked flawlessly.

While it works, it's obviously wrong. Why does it work though? Usually
there's a list op happening pretty soon after that which brings the
list into proper state.

I've been playing with a patch that adds a magic value into list_head
if CONFIG_DEBUG_LIST is set, and checks that magic in the list debug
code in lib/list_debug.c.

Does it sound like something useful? If so I'll send that patch out.


Thanks,
Sasha