From: Alexander Duyck <[email protected]> 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" <[email protected]> > Cc: [email protected] > Signed-off-by: Alexander Duyck <[email protected]> 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.
