diff -Nru linux/arch/mips/kernel/scall_o32.S.orig linux/arch/mips/kernel/scall_o32.S
--- linux/arch/mips/kernel/scall_o32.S.orig	Sat Dec  8 13:04:24 2001
+++ linux/arch/mips/kernel/scall_o32.S	Thu Jan 10 16:55:26 2002
@@ -230,8 +230,25 @@
 	 * At this point the page should be readable and writable unless
 	 * there was no more memory available.
 	 */
+
+	/*
+	 * turn off interrupt so that interrupt handler can't mess the value
+  	 */
+	mfc0	t0, CP0_STATUS
+	ori	t1, t0, 1
+	xori	t1, 1
+	mtc0	t1, CP0_STATUS
+	nop
+	nop
+	nop
+
 1:	lw	v0, (a1)
 2:	sw	a2, (a1)
+
+	/*
+	 * restore interrupt status
+	 */
+	mtc0	t0, CP0_STATUS
 
 	.section __ex_table,"a"
 	PTR	1b, no_mem