powerpc/mm: Standardise on MMU_NO_CONTEXT

Use MMU_NO_CONTEXT as the initialiser for mm_context.id on
nohash and hash64.

Signed-off-by: Michael Ellerman <[e-mail]>
Signed-off-by: Benjamin Herrenschmidt <[e-mail]>

arch/powerpc/include/asm/tlbflush.h

···
 
 #elif defined(CONFIG_PPC_STD_MMU_64)
 
+#define MMU_NO_CONTEXT		0
+
 /*
  * TLB flushing for 64-bit hash-MMU CPUs
  */

arch/powerpc/mm/mmu_context_hash64.c

···
  * Each segment contains 2^28 bytes.  Each context maps 2^44 bytes,
  * so we can support 2^19-1 contexts (19 == 35 + 28 - 44).
  */
-#define NO_CONTEXT	0
 #define MAX_CONTEXT	((1UL << 19) - 1)
 
 int __init_new_context(void)
···
 {
 	__destroy_context(mm->context.id);
 	subpage_prot_free(mm);
-	mm->context.id = NO_CONTEXT;
+	mm->context.id = MMU_NO_CONTEXT;
 }