Pull button into test branch

[linux-drm-fsl-dcu.git] / arch / mips / mm / init.c

diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index ea2d15370bb72ecef36f99656049b092073bff9c..30245c09d0258e224475b0ceeb9e50d7c6c797a1 100644 (file)
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -203,6 +203,31 @@ static inline void kunmap_coherent(struct page *page)
        preempt_check_resched();
 }
 
+void copy_user_highpage(struct page *to, struct page *from,
+       unsigned long vaddr, struct vm_area_struct *vma)
+{
+       void *vfrom, *vto;
+
+       vto = kmap_atomic(to, KM_USER1);
+       if (cpu_has_dc_aliases) {
+               vfrom = kmap_coherent(from, vaddr);
+               copy_page(vto, vfrom);
+               kunmap_coherent(from);
+       } else {
+               vfrom = kmap_atomic(from, KM_USER0);
+               copy_page(vto, vfrom);
+               kunmap_atomic(vfrom, KM_USER0);
+       }
+       if (((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc) ||
+           pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
+               flush_data_cache_page((unsigned long)vto);
+       kunmap_atomic(vto, KM_USER1);
+       /* Make sure this page is cleared on other CPU's too before using it */
+       smp_wmb();
+}
+
+EXPORT_SYMBOL(copy_user_highpage);
+
 void copy_to_user_page(struct vm_area_struct *vma,
        struct page *page, unsigned long vaddr, void *dst, const void *src,
        unsigned long len)