From: Thadeu Lima de Souza Cascardo Date: Tue, 20 Sep 2011 03:07:24 +0000 (+0000) Subject: powerpc: Reserve iommu page 0 X-Git-Tag: v3.2-rc1~34^2~39 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d12b524f8b2f4e45cabe8bc1501e8b967d543111;p=pandora-kernel.git powerpc: Reserve iommu page 0 Some devices have a dma-window that starts at the address 0. This allows DMA addresses to be mapped to this address and returned to drivers as a valid DMA address. Some drivers may not behave well in this case, since the address 0 is considered an error or not allocated. The solution to avoid this kind of error from happening is reserve the page addressed as 0 so it cannot be allocated for a DMA mapping. Signed-off-by: Thadeu Lima de Souza Cascardo Signed-off-by: Benjamin Herrenschmidt --- Reading git-diff-tree failed