powerpc/44x: Don't support 47x code and non 47x code at the same time

440/460 variants and 470 variants are not compatible, no
need to make code supporting both and using MMU features.

Just use CONFIG_PPC_47x to decide what to build.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c3e64da3d5d068c69a201e03bbae7da055761e5b.1603041883.git.christophe.leroy@csgroup.eu

arch/powerpc/kernel/entry_32.S

@@ -448,15 +448,13 @@ syscall_exit_cont:
 	andis.	r10,r0,DBCR0_IDM@h
 	bnel-	load_dbcr0
 #endif
-#ifdef CONFIG_44x
-BEGIN_MMU_FTR_SECTION
+#ifdef CONFIG_PPC_47x
 	lis	r4,icache_44x_need_flush@ha
 	lwz	r5,icache_44x_need_flush@l(r4)
 	cmplwi	cr0,r5,0
 	bne-	2f
+#endif /* CONFIG_PPC_47x */
 1:
-END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_47x)
-#endif /* CONFIG_44x */
 BEGIN_FTR_SECTION
 	lwarx	r7,0,r1
 END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX)
@@ -966,10 +964,7 @@ restore_kuap:
 
 	/* interrupts are hard-disabled at this point */
 restore:
-#ifdef CONFIG_44x
-BEGIN_MMU_FTR_SECTION
-	b	1f
-END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_47x)
+#if defined(CONFIG_44x) && !defined(CONFIG_PPC_47x)
 	lis	r4,icache_44x_need_flush@ha
 	lwz	r5,icache_44x_need_flush@l(r4)
 	cmplwi	cr0,r5,0

arch/powerpc/mm/nohash/tlb_low.S

@@ -92,36 +92,25 @@ _GLOBAL(__tlbil_va)
 	tlbsx.	r6,0,r3
 	bne	10f
 	sync
-BEGIN_MMU_FTR_SECTION
-	b	2f
-END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_47x)
+#ifndef CONFIG_PPC_47x
 	/* On 440 There are only 64 TLB entries, so r3 < 64, which means bit
 	 * 22, is clear.  Since 22 is the V bit in the TLB_PAGEID, loading this
 	 * value will invalidate the TLB entry.
 	 */
 	tlbwe	r6,r6,PPC44x_TLB_PAGEID
-	isync
-10:	wrtee	r10
-	blr
-2:
-#ifdef CONFIG_PPC_47x
+#else
 	oris	r7,r6,0x8000	/* specify way explicitly */
 	clrrwi	r4,r3,12	/* get an EPN for the hashing with V = 0 */
 	ori	r4,r4,PPC47x_TLBE_SIZE
 	tlbwe   r4,r7,0		/* write it */
+#endif /* !CONFIG_PPC_47x */
 	isync
-	wrtee	r10
+10:	wrtee	r10
 	blr
-#else /* CONFIG_PPC_47x */
-1:	trap
-	EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0;
-#endif /* !CONFIG_PPC_47x */
 
 _GLOBAL(_tlbil_all)
 _GLOBAL(_tlbil_pid)
-BEGIN_MMU_FTR_SECTION
-	b	2f
-END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_47x)
+#ifndef CONFIG_PPC_47x
 	li	r3,0
 	sync
 
@@ -136,8 +125,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_47x)
 
 	isync
 	blr
-2:
-#ifdef CONFIG_PPC_47x
+#else
 	/* 476 variant. There's not simple way to do this, hopefully we'll
 	 * try to limit the amount of such full invalidates
 	 */
@@ -179,11 +167,8 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_47x)
 	b	1b		/* Then loop */
 1:	isync			/* Sync shadows */
 	wrtee	r11
-#else /* CONFIG_PPC_47x */
-1:	trap
-	EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0;
-#endif /* !CONFIG_PPC_47x */
 	blr
+#endif /* !CONFIG_PPC_47x */
 
 #ifdef CONFIG_PPC_47x