Re: [PATCH] ACPI: remove unnecessary INIT_LIST_HEAD

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On Tue, 2012-11-27 at 11:24 +0200, Westerberg, Mika wrote: 
> On Tue, Nov 27, 2012 at 11:03:45AM +0200, Andy Shevchenko wrote:
> > There is no need to initialize the node before appending it to the list.
> 
> I might be missing something but why do we then have macros like:
> list_del_init() etc?

list_del_init(&list->node) allows to reuse &list->node as a new list.
I guess the often use case of that when you extract the leaf node from
the list of lists and create a new list based on it.

In our case we just add a node to the existed list.


> > 
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> > ---
> >  drivers/acpi/resource.c |    1 -
> >  1 file changed, 1 deletion(-)
> > 
> > diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
> > index 4107c00..a3868f6 100644
> > --- a/drivers/acpi/resource.c
> > +++ b/drivers/acpi/resource.c
> > @@ -426,7 +426,6 @@ static acpi_status acpi_dev_new_resource_entry(struct resource *r,
> >  		c->error = -ENOMEM;
> >  		return AE_NO_MEMORY;
> >  	}
> > -	INIT_LIST_HEAD(&rentry->node);
> >  	rentry->res = *r;
> >  	list_add_tail(&rentry->node, c->list);
> >  	c->count++;
> > -- 
> > 1.7.10.4

-- 
Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Intel Finland Oy
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