--- arch/sparc/kernel/tsb.S.orig 2010-10-05 19:46:55.272218523 +0400
+++ arch/sparc/kernel/tsb.S 2010-10-05 19:48:56.136235329 +0400
@@ -396,6 +396,9 @@ __tsb_context_switch:

 2:	ldx	[%o1 + TSB_CONFIG_MAP_VADDR], %o4
 	brz	%o4, 9f
+	or	%o4, 1 << 5, %o5
+	stxa	%g0, [%o5] ASI_DMMU_DEMAP
+	membar	#Sync
 	 ldx	[%o1 + TSB_CONFIG_MAP_PTE], %o5
 
 	sethi	%hi(sparc64_highest_unlocked_tlb_ent), %g2