linux-kernel - Re: [PATCH] Remove completion from struct klist

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Message-ID: <20081003204124.GA3269@kroah.com>
Date:	Fri, 3 Oct 2008 13:41:24 -0700
From:	Greg KH <greg@...ah.com>
To:	Matthew Wilcox <matthew@....cx>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Remove completion from struct klist_node

On Fri, Oct 03, 2008 at 08:06:19AM -0600, Matthew Wilcox wrote:
> On Thu, Oct 02, 2008 at 03:17:45PM -0700, Greg KH wrote:
> > > +struct klist_waiter {
> > > +	struct klist_waiter *next;
> > > +	struct klist_node *node;
> > > +	struct task_struct *process;
> > > +	int woken;
> > > +};
> > 
> > Why not use the built-in list.h functions here?
> 
> I'm somewhat averse to using data structures when they do more than I
> need them to.

But part of the point is that if you use them, no one has to audit your
logic to make sure you got it all correct.

> list_heads are great for when you need to remove an entry
> from the middle of a list, but there are no advantages to using a
> doubly-linked list here -- we always walk it from the start to the end,
> and a singly linked list is fine for this purpose.  Maybe we need a set
> of 'slist' macros so we can use singly-linked-lists without thinking
> terribly hard, but I'd hate to see this patch get stuck behind
> infrastructure improvements.

Is size an issue here?  I don't think so and I'd prefer it to be changed
to use the standard list implementation and not roll your own.  You
never know who will cut-and-paste you code these days :)

Care to respin this?

thanks,

greg k-h
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