From: David S. Miller <davem@davemloft.net>
Date: Wed, 8 Apr 2015 16:15:15 +0000 (-0400)
Subject: Merge branch 'dma_rmb_wmb'
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b5de97bc1753fb9c5be103a820ea5473923ca067;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

Merge branch 'dma_rmb_wmb'

Alexander Duyck says:

====================
Replace wmb()/rmb() with dma_wmb()/dma_rmb() where appropriate

This is a start of a side project cleaning up the drivers that can make use
of the dma_wmb and dma_rmb calls.  The general idea is to start removing
the unnecessary wmb/rmb calls from a number of drivers and to make use of
the lighter weight dma_wmb/dma_rmb calls as this should allow for an
overall improvement in performance as each barrier can cost a significant
number of cycles and on architectures such as x86 this is unnecessary.

These changes are what I would consider low hanging fruit.  The likelihood
of the changes introducing an error should be low since the use of the
barriers in these cases are fairly obvious.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
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b5de97bc1753fb9c5be103a820ea5473923ca067