dma-mapping: use offset_in_page macro

Use offset_in_page macro instead of (addr & ~PAGE_MASK).

Signed-off-by: Geliang Tang <geliangtang@163.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index d6b575b..75857cd 100644 (file)
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -129,10 +129,10 @@ static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
        kmemcheck_mark_initialized(ptr, size);
        BUG_ON(!valid_dma_direction(dir));
        addr = ops->map_page(dev, virt_to_page(ptr),
-                            (unsigned long)ptr & ~PAGE_MASK, size,
+                            offset_in_page(ptr), size,
                             dir, attrs);
        debug_dma_map_page(dev, virt_to_page(ptr),
-                          (unsigned long)ptr & ~PAGE_MASK, size,
+                          offset_in_page(ptr), size,
                           dir, addr, true);
        return addr;
 }