powerpc: Replace RFI by rfi on book3s/32 and booke

For book3s/32 and for booke, RFI is just an rfi.
Only 40x has a non trivial RFI.
CONFIG_PPC_RTAS is never selected by 40x platforms.

Make it more explicit by replacing RFI by rfi wherever possible.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/b901ddfdeb8a0a3b7cb59999599cdfde1bbfe834.1604854583.git.christophe.leroy@csgroup.eu

arch/powerpc/kernel/entry_32.S

@@ -1027,7 +1027,7 @@ exc_exit_restart:
 	lwz	r1,GPR1(r1)
 	.globl exc_exit_restart_end
 exc_exit_restart_end:
-	RFI
+	rfi
 _ASM_NOKPROBE_SYMBOL(exc_exit_restart)
 _ASM_NOKPROBE_SYMBOL(exc_exit_restart_end)
 
@@ -1356,7 +1356,7 @@ _GLOBAL(enter_rtas)
 	stw	r7, THREAD + RTAS_SP(r2)
 	mtspr	SPRN_SRR0,r8
 	mtspr	SPRN_SRR1,r9
-	RFI
+	rfi
 1:	tophys_novmstack r9, r1
 #ifdef CONFIG_VMAP_STACK
 	li	r0, MSR_KERNEL & ~MSR_IR	/* can take DTLB miss */
@@ -1371,6 +1371,6 @@ _GLOBAL(enter_rtas)
 	stw	r0, THREAD + RTAS_SP(r7)
 	mtspr	SPRN_SRR0,r8
 	mtspr	SPRN_SRR1,r9
-	RFI			/* return to caller */
+	rfi			/* return to caller */
 _ASM_NOKPROBE_SYMBOL(enter_rtas)
 #endif /* CONFIG_PPC_RTAS */

arch/powerpc/kernel/head_book3s_32.S

@@ -206,7 +206,7 @@ turn_on_mmu:
 	lis	r0,start_here@h
 	ori	r0,r0,start_here@l
 	mtspr	SPRN_SRR0,r0
-	RFI				/* enables MMU */
+	rfi				/* enables MMU */
 
 /*
  * We need __secondary_hold as a place to hold the other cpus on
@@ -769,13 +769,13 @@ fast_hash_page_return:
 	mtcr	r11
 	lwz	r11, THR11(r10)
 	mfspr	r10, SPRN_SPRG_SCRATCH0
-	RFI
+	rfi
 
 1:	/* ISI */
 	mtcr	r11
 	mfspr	r11, SPRN_SPRG_SCRATCH1
 	mfspr	r10, SPRN_SPRG_SCRATCH0
-	RFI
+	rfi
 
 stack_overflow:
 	vmap_stack_overflow_exception
@@ -910,7 +910,7 @@ __secondary_start:
 	ori	r3,r3,start_secondary@l
 	mtspr	SPRN_SRR0,r3
 	mtspr	SPRN_SRR1,r4
-	RFI
+	rfi
 #endif /* CONFIG_SMP */
 
 #ifdef CONFIG_KVM_BOOK3S_HANDLER
@@ -1038,7 +1038,7 @@ start_here:
 	.align	4
 	mtspr	SPRN_SRR0,r4
 	mtspr	SPRN_SRR1,r3
-	RFI
+	rfi
 /* Load up the kernel context */
 2:	bl	load_up_mmu
 
@@ -1062,7 +1062,7 @@ start_here:
 	ori	r3,r3,start_kernel@l
 	mtspr	SPRN_SRR0,r3
 	mtspr	SPRN_SRR1,r4
-	RFI
+	rfi
 
 /*
  * void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next);
@@ -1177,7 +1177,7 @@ _ENTRY(update_bats)
 	.align	4
 	mtspr	SPRN_SRR0, r4
 	mtspr	SPRN_SRR1, r3
-	RFI
+	rfi
 1:	bl	clear_bats
 	lis	r3, BATS@ha
 	addi	r3, r3, BATS@l
@@ -1196,7 +1196,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)
 	mtmsr	r3
 	mtspr	SPRN_SRR0, r7
 	mtspr	SPRN_SRR1, r6
-	RFI
+	rfi
 
 flush_tlbs:
 	lis	r10, 0x40
@@ -1217,7 +1217,7 @@ mmu_off:
 	mtspr	SPRN_SRR0,r4
 	mtspr	SPRN_SRR1,r3
 	sync
-	RFI
+	rfi
 
 /* We use one BAT to map up to 256M of RAM at _PAGE_OFFSET */
 initial_bats:

arch/powerpc/kernel/head_booke.h

@@ -176,7 +176,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
 #endif
 	mtspr	SPRN_SRR1,r10
 	mtspr	SPRN_SRR0,r11
-	RFI				/* jump to handler, enable MMU */
+	rfi				/* jump to handler, enable MMU */
 99:	b	ret_from_kernel_syscall
 .endm
 

arch/powerpc/kvm/book3s_rmhandlers.S

@@ -36,8 +36,8 @@
 
 #define FUNC(name)		name
 
-#define RFI_TO_KERNEL	RFI
-#define RFI_TO_GUEST	RFI
+#define RFI_TO_KERNEL	rfi
+#define RFI_TO_GUEST	rfi
 
 .macro INTERRUPT_TRAMPOLINE intno