Re: [PATCH] add safe version of list_for_each_entry() to list.h

[Andrew Morton <akpm@digeo.com>]

Matthew Wilcox wrote:
> 
> On Fri, Oct 04, 2002 at 10:48:33AM -0500, Mark Peloquin wrote:
> > list_empty() can be used on check list heads *or*
> > to check if a list element is currently in a list,
> > assuming the coder uses list_del_init(). However,
> > if the coder chooses to use list_del() [which sets
> > the prev and next fields to 0] instead, there is no
> > corresponding function to indicate if that element
> > is currently on a list. This function does that.
> 
> That behaviour for list_del is new and, IMNSHO, bogus.  There's now _zero_
> gain in using list_del instead of list_del_init.  akpm changed it about
> 5 months ago with a comment that says:
> 
> "list_head debugging"
> 

It doesn't seem to have caught anyone out, so I guess we can
put it back now.  I'll do a patch.