ppc: Export tlb_44x_hwater for KVM

PowerPC 440 KVM needs to know how many TLB entries are used for the host kernel
linear mapping (it does not modify these mappings when switching between guest
and host execution).
Signed-off-by: NHollis Blanchard <hollisb@us.ibm.com>
Acked-by: NJosh Boyer <jwboyer@linux.vnet.ibm.com>
Acked-by: NPaul Mackerras <paulus@samba.org>
Signed-off-by: NAvi Kivity <avi@qumranet.com>

include/asm-powerpc/mmu-44x.h

@@ -53,6 +53,8 @@
 
 #ifndef __ASSEMBLY__
 
+extern unsigned int tlb_44x_hwater;
+
 typedef struct {
 	unsigned long id;
 	unsigned long vdso_base;