1 files changed, 19 insertions, 0 deletions

diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index 8b7599808dd5..faaca21a3718 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -129,6 +129,25 @@ lazy_mmu_prot_update (pte_t pte)
         set_bit(PG_arch_1, &page->flags);       /* mark page as clean */
 }
 
+/*
+ * Since DMA is i-cache coherent, any (complete) pages that were written via
+ * DMA can be marked as "clean" so that lazy_mmu_prot_update() doesn't have to
+ * flush them when they get mapped into an executable vm-area.
+ */
+void
+dma_mark_clean(void *addr, size_t size)
+{
+        unsigned long pg_addr, end;
+
+        pg_addr = PAGE_ALIGN((unsigned long) addr);
+        end = (unsigned long) addr + size;
+        while (pg_addr + PAGE_SIZE <= end) {
+                struct page *page = virt_to_page(pg_addr);
+                set_bit(PG_arch_1, &page->flags);
+                pg_addr += PAGE_SIZE;
+        }
+}
+
 inline void
 ia64_set_rbs_bot (void)
 {