[Xen-devel] [PATCH v2 2/3] xen/swiotlb: simplify range_straddles_page_boundary()

[Juergen Gross <jgross@xxxxxxxx>]

range_straddles_page_boundary() is open coding several macros from
include/xen/page.h. Use those instead. Additionally there is no need
to have check_pages_physically_contiguous() as a separate function as
it is used only once, so merge it into range_straddles_page_boundary().

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
 drivers/xen/swiotlb-xen.c | 28 ++++++----------------------
 1 file changed, 6 insertions(+), 22 deletions(-)

diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 1caadca124b3..aba5247b9145 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -92,34 +92,18 @@ static inline dma_addr_t xen_virt_to_bus(void *address)
        return xen_phys_to_bus(virt_to_phys(address));
 }
 
-static int check_pages_physically_contiguous(unsigned long xen_pfn,
-                                            unsigned int offset,
-                                            size_t length)
+static inline int range_straddles_page_boundary(phys_addr_t p, size_t size)
 {
-       unsigned long next_bfn;
-       int i;
-       int nr_pages;
+       unsigned long next_bfn, xen_pfn = XEN_PFN_DOWN(p);
+       unsigned int i, nr_pages = XEN_PFN_UP(xen_offset_in_page(p) + size);
 
        next_bfn = pfn_to_bfn(xen_pfn);
-       nr_pages = (offset + length + XEN_PAGE_SIZE-1) >> XEN_PAGE_SHIFT;
 
-       for (i = 1; i < nr_pages; i++) {
+       for (i = 1; i < nr_pages; i++)
                if (pfn_to_bfn(++xen_pfn) != ++next_bfn)
-                       return 0;
-       }
-       return 1;
-}
+                       return 1;
 
-static inline int range_straddles_page_boundary(phys_addr_t p, size_t size)
-{
-       unsigned long xen_pfn = XEN_PFN_DOWN(p);
-       unsigned int offset = p & ~XEN_PAGE_MASK;
-
-       if (offset + size <= XEN_PAGE_SIZE)
-               return 0;
-       if (check_pages_physically_contiguous(xen_pfn, offset, size))
-               return 0;
-       return 1;
+       return 0;
 }
 
 static int is_xen_swiotlb_buffer(dma_addr_t dma_addr)
-- 
2.16.4


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