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

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.