Re: [PATCH]use kzalloc in vfs where appropriate

[Oliver Neukum <oliver@neukum.org>]

Am Samstag, 18. März 2006 11:55 schrieb Arjan van de Ven:
> On Sat, 2006-03-18 at 11:44 +0100, Oliver Neukum wrote:
> > Am Freitag, 17. März 2006 22:08 schrieb Matthew Wilcox:
> > > On Fri, Mar 17, 2006 at 09:58:14PM +0100, Oliver Neukum wrote:
> > > > --- a/fs/bio.c	2006-03-11 23:12:55.000000000 +0100
> > > > +++ b/fs/bio.c	2006-03-17 16:44:49.000000000 +0100
> > > > @@ -635,12 +635,10 @@
> > > >  		return ERR_PTR(-ENOMEM);
> > > >  
> > > >  	ret = -ENOMEM;
> > > > -	pages = kmalloc(nr_pages * sizeof(struct page *), GFP_KERNEL);
> > > > +	pages = kzalloc(nr_pages * sizeof(struct page *), GFP_KERNEL);
> > > 
> > > Didn't we just discuss this one and conclude it needed to use kcalloc
> > > instead?
> > 
> > I've found some discussion in the archive, but no conclusion. Could you
> > elaborate?
> 
> kcalloc is the array allocator.
> Here.. you're allocating an array of nr_pages worth of pointers.
> kcalloc does extra checks because it KNOWS it's an array...

I see. A patch is coming.
Shouldn't this check from slab.h:

	if (n != 0 && size > INT_MAX / n)
		return NULL;

carry an "unlikely"?

	Regards
		Oliver