Re: Possible error in fs/buffer.c

["Robert W. Maloy" <r.w.maloy@acm.org>]

> Andrew Morton wrote:
> This is saying "is the buffer is not on any list, then place it on
> the mapping's list now.  If the buffer _is_ already on some list
> then we know it must already be on mapping->private_list, so we
> have nothing to do".
>
> Re-dirtying an already-dirty buffer is an extremely common case,
> and here we look for an opportunity to avoid dirtying a cacheline
> or two.

This makes some since except that
     buffer_insert_list(&buffer_mapping->private_lock,
              bh, &mapping->private_list);

 only adds &bh->b_assoc_buffers to the end of mapping->private_list 
not the buffer itself.

-- 
Cheers
Rob Maloy
r.w.maloy@acm.org
(410) 854-6637