Trust the compiler to do optimize simple stuff like this. This also

helps to avoid stupid mistakes. The driver works again, though things
are still not stable.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26605 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/tests/system/kernel/device_manager/dma_resource_test.cpp

@@ -177,7 +177,7 @@ do_io(void* data, IOOperation* operation)
 		const iovec& vec = operation->Vecs()[i];
 		addr_t base = (addr_t)vec.iov_base;
 		size_t length = vec.iov_len;
-		size_t pageOffset = base & ~(B_PAGE_SIZE - 1);
+		size_t pageOffset = base % B_PAGE_SIZE;
 
 		while (length > 0) {
 			size_t toCopy = min_c(length, B_PAGE_SIZE - pageOffset);