From: Dan Williams <dan.j.williams@intel.com>
Date: Fri, 20 Nov 2009 00:10:37 +0000 (-0700)
Subject: async_tx: build-time toggling of async_{syndrome,xor}_val dma support
X-Git-Tag: v2.6.32~52^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7b3cc2b1fc2066391e498f3387204908c4eced21;p=pandora-kernel.git

async_tx: build-time toggling of async_{syndrome,xor}_val dma support

ioat3.2 does not support asynchronous error notifications which makes
the driver experience latencies when non-zero pq validate results are
expected.  Provide a mechanism for turning off async_xor_val and
async_syndrome_val via Kconfig.  This approach is generally useful for
any driver that specifies ASYNC_TX_DISABLE_CHANNEL_SWITCH and would like
to force the async_tx api to fall back to the synchronous path for
certain operations.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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