vm: add no-mmu vm_iomap_memory() stub

[~andy/linux] / mm / nommu.c

diff --git a/mm/nommu.c b/mm/nommu.c
index e19328087534af9f77371866c9afe30c70e3ff89..e001768b14e810029d65f1dce09cc5a391f56985 100644 (file)
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -821,7 +821,7 @@ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
        struct vm_area_struct *vma;
 
        /* check the cache first */
-       vma = mm->mmap_cache;
+       vma = ACCESS_ONCE(mm->mmap_cache);
        if (vma && vma->vm_start <= addr && vma->vm_end > addr)
                return vma;
 
@@ -1838,6 +1838,16 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
 }
 EXPORT_SYMBOL(remap_pfn_range);
 
+int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len)
+{
+       unsigned long pfn = start >> PAGE_SHIFT;
+       unsigned long vm_len = vma->vm_end - vma->vm_start;
+
+       pfn += vma->vm_pgoff;
+       return io_remap_pfn_range(vma, vma->vm_start, pfn, vm_len, vma->vm_page_prot);
+}
+EXPORT_SYMBOL(vm_iomap_memory);
+
 int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
                        unsigned long pgoff)
 {