Messages in this thread | | | Date | Mon, 24 Oct 2016 14:27:30 -0400 (EDT) | Subject | Re: [net-next PATCH RFC 19/26] arch/sparc: Add option to skip DMA sync as a part of map and unmap | From | David Miller <> |
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From: Alexander Duyck <alexander.h.duyck@intel.com> Date: Mon, 24 Oct 2016 08:06:07 -0400
> This change allows us to pass DMA_ATTR_SKIP_CPU_SYNC which allows us to > avoid invoking cache line invalidation if the driver will just handle it > via a sync_for_cpu or sync_for_device call. > > Cc: "David S. Miller" <davem@davemloft.net> > Cc: sparclinux@vger.kernel.org > Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
This is fine for avoiding the flush for performance reasons, but the chip isn't going to write anything back unless the device wrote into the area.
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