powerpc/32s: Inline tlb_flush()

On book3s/32, tlb_flush() does nothing when the CPU has a hash table,
it calls _tlbia() otherwise.

Inline it.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/ebc933d1c530a19ef3cf7983f6ae94814f6e92ac.1603348103.git.christophe.leroy@csgroup.eu

arch/powerpc/include/asm/book3s/32/tlbflush.h

@@ -20,6 +20,17 @@ static inline void _tlbie(unsigned long address)
 #endif
 void _tlbia(void);
 
+/*
+ * Called at the end of a mmu_gather operation to make sure the
+ * TLB flush is completely done.
+ */
+static inline void tlb_flush(struct mmu_gather *tlb)
+{
+	/* 603 needs to flush the whole TLB here since it doesn't use a hash table. */
+	if (!mmu_has_feature(MMU_FTR_HPTE_TABLE))
+		_tlbia();
+}
+
 static inline void flush_range(struct mm_struct *mm, unsigned long start, unsigned long end)
 {
 	start &= PAGE_MASK;

arch/powerpc/mm/book3s32/tlb.c

@@ -43,21 +43,6 @@ void flush_hash_entry(struct mm_struct *mm, pte_t *ptep, unsigned long addr)
 }
 EXPORT_SYMBOL(flush_hash_entry);
 
-/*
- * Called at the end of a mmu_gather operation to make sure the
- * TLB flush is completely done.
- */
-void tlb_flush(struct mmu_gather *tlb)
-{
-	if (!mmu_has_feature(MMU_FTR_HPTE_TABLE)) {
-		/*
-		 * 603 needs to flush the whole TLB here since
-		 * it doesn't use a hash table.
-		 */
-		_tlbia();
-	}
-}
-
 /*
  * TLB flushing:
  *