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Since gvt calls pin_map for the shadow batch buffer, this makes the action of prepare_write [+pin_pages] redundant. We can write into the obj->mm.mapping directory and the flush_map routine knows when it has to flush the cpu cache afterwards. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200619234543.17499-1-chris@chris-wilson.co.uk