[Xen-devel] [REBASE PATCH v5 2/9] arm: mm: dma-mapping: Convert to use vm_map_pages()

[Souptick Joarder <jrdr.linux@xxxxxxxxx>]

Convert to use vm_map_pages() to map range of kernel
memory to user vma.

Signed-off-by: Souptick Joarder <jrdr.linux@xxxxxxxxx>
---
 arch/arm/mm/dma-mapping.c | 22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index f1e2922..de7c76e 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1575,31 +1575,21 @@ static int __arm_iommu_mmap_attrs(struct device *dev, 
struct vm_area_struct *vma
                    void *cpu_addr, dma_addr_t dma_addr, size_t size,
                    unsigned long attrs)
 {
-       unsigned long uaddr = vma->vm_start;
-       unsigned long usize = vma->vm_end - vma->vm_start;
        struct page **pages = __iommu_get_pages(cpu_addr, attrs);
        unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
-       unsigned long off = vma->vm_pgoff;
+       int err;
 
        if (!pages)
                return -ENXIO;
 
-       if (off >= nr_pages || (usize >> PAGE_SHIFT) > nr_pages - off)
+       if (vma->vm_pgoff >= nr_pages)
                return -ENXIO;
 
-       pages += off;
-
-       do {
-               int ret = vm_insert_page(vma, uaddr, *pages++);
-               if (ret) {
-                       pr_err("Remapping memory failed: %d\n", ret);
-                       return ret;
-               }
-               uaddr += PAGE_SIZE;
-               usize -= PAGE_SIZE;
-       } while (usize > 0);
+       err = vm_map_pages(vma, pages, nr_pages);
+       if (err)
+               pr_err("Remapping memory failed: %d\n", err);
 
-       return 0;
+       return err;
 }
 static int arm_iommu_mmap_attrs(struct device *dev,
                struct vm_area_struct *vma, void *cpu_addr,
-- 
1.9.1


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