diff -Nru linux/include/asm-mips/tlb.h.orig linux/include/asm-mips/tlb.h
--- linux/include/asm-mips/tlb.h.orig	Thu Oct 31 08:35:52 2002
+++ linux/include/asm-mips/tlb.h	Thu Jan 15 10:02:14 2004
@@ -2,9 +2,14 @@
 #define __ASM_TLB_H
 
 /*
- * MIPS doesn't need any special per-pte or per-vma handling..
+ * MIPS doesn't need any special per-pte or per-vma handling, except
+ * we need to flush cache for area to be unmapped.
  */
-#define tlb_start_vma(tlb, vma) do { } while (0)
+#define tlb_start_vma(tlb, vma) 				\
+	do {							\
+		if (!tlb->fullmm)				\
+			flush_cache_range(vma, vma->vm_start, vma->vm_end); \
+	}  while (0)
 #define tlb_end_vma(tlb, vma) do { } while (0)
 #define __tlb_remove_tlb_entry(tlb, ptep, address) do { } while (0)