[PATCH 2/5] spi: pl022: use generic DMA slave configuration if possible

[Russell King - ARM Linux]

On Thu, Feb 07, 2013 at 07:29:17PM +0100, Linus Walleij wrote:
> Actually I once read about a feature where the kernel provides
> a static page full of zeroes or something like this, that would be
> ideal to use in cases like this, then all of this dummy page
> allocation and freeing can be deleted.

I think you're thinking of empty_zero_page which is used to provide the
initial BSS pages for user apps.