[RFC PATCH] scatterlist: Initialize the dma_address field with invalid dma address

[David Miller]

From: Nicolas Ferre <nicolas.ferre at atmel.com>
Date: Thu,  9 Dec 2010 14:15:14 +0100

> Initialize the the dma_address field so that it will be possible to test
> its value while using scatterlists. This field will be compatible with
> testing by dma_mapping_error().
> 
> Signed-off-by: Nicolas Ferre <nicolas.ferre at atmel.com>

Please don't do this, it's unjustified and it's going to kill performance.
Even if it were a good change, you should have used the invalid DMA
address definition defined by various architectures instead of a constant.

You should be aware of whether entries in a scatterlist have been setup
by your code path.