dma-mapping: move dma_get_required_mask to kernel/dma

dma_get_required_mask should really be with the rest of the DMA mapping
implementation instead of in drivers/base as a lone outlier.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Tested-by: Jesper Dangaard Brouer <brouer@redhat.com>
Tested-by: Tony Luck <tony.luck@intel.com>

1 files changed, 0 insertions, 31 deletions

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 41b91af95afb..eae841935a45 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -1179,37 +1179,6 @@ int __init platform_bus_init(void)
         return error;
 }
 
-#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
-static u64 dma_default_get_required_mask(struct device *dev)
-{
-        u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
-        u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
-        u64 mask;
-
-        if (!high_totalram) {
-                /* convert to mask just covering totalram */
-                low_totalram = (1 << (fls(low_totalram) - 1));
-                low_totalram += low_totalram - 1;
-                mask = low_totalram;
-        } else {
-                high_totalram = (1 << (fls(high_totalram) - 1));
-                high_totalram += high_totalram - 1;
-                mask = (((u64)high_totalram) << 32) + 0xffffffff;
-        }
-        return mask;
-}
-
-u64 dma_get_required_mask(struct device *dev)
-{
-        const struct dma_map_ops *ops = get_dma_ops(dev);
-
-        if (ops->get_required_mask)
-                return ops->get_required_mask(dev);
-        return dma_default_get_required_mask(dev);
-}
-EXPORT_SYMBOL_GPL(dma_get_required_mask);
-#endif
-
 static __initdata LIST_HEAD(early_platform_driver_list);
 static __initdata LIST_HEAD(early_platform_device_list);