ARM: p2v: factor out shared loop processing

mainline inclusion
from mainline-5.11-rc1
commit 4b16421c
category: bugfix
bugzilla: 46882
CVE: NA

-------------------------------------------------
The ARM and Thumb2 versions of the p2v patching loop have some overlap
at the end of the loop, so factor that out. As numeric labels are not
required to be unique, and may therefore be ambiguous, use named local
labels for the start and end of the loop instead.
Acked-by: NNicolas Pitre <nico@fluxnic.net>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NArd Biesheuvel <ardb@kernel.org>
(cherry picked from commit 4b16421c)
Signed-off-by: NZhao Hongjiang <zhaohongjiang@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>

arch/arm/kernel/phys2virt.S

@@ -68,7 +68,7 @@ __fixup_a_pv_table:
 #ifdef CONFIG_THUMB2_KERNEL
 	moveq	r0, #0x200000		@ set bit 21, mov to mvn instruction
 	lsls	r6, #24
-	beq	2f
+	beq	.Lnext
 	clz	r7, r6
 	lsr	r6, #24
 	lsl	r6, r7
@@ -77,8 +77,8 @@ __fixup_a_pv_table:
 	orrcs	r6, #0x0080
 	orr	r6, r6, r7, lsl #12
 	orr	r6, #0x4000
-	b	2f
-1:	add	r7, r3
+	b	.Lnext
+.Lloop:	add	r7, r3
 	ldrh	ip, [r7, #2]
 ARM_BE8(rev16	ip, ip)
 	tst	ip, #0x4000
@@ -87,21 +87,17 @@ ARM_BE8(rev16	ip, ip)
 	orreq	ip, r0			@ mask in offset bits 7-0
 ARM_BE8(rev16	ip, ip)
 	strh	ip, [r7, #2]
-	bne	2f
+	bne	.Lnext
 	ldrh	ip, [r7]
 ARM_BE8(rev16	ip, ip)
 	bic	ip, #0x20
 	orr	ip, ip, r0, lsr #16
 ARM_BE8(rev16	ip, ip)
 	strh	ip, [r7]
-2:	cmp	r4, r5
-	ldrcc	r7, [r4], #4		@ use branch for delay slot
-	bcc	1b
-	bx	lr
 #else
 	moveq	r0, #0x400000		@ set bit 22, mov to mvn instruction
-	b	2f
-1:	ldr	ip, [r7, r3]
+	b	.Lnext
+.Lloop:	ldr	ip, [r7, r3]
 #ifdef CONFIG_CPU_ENDIAN_BE8
 	@ in BE8, we load data in BE, but instructions still in LE
 	bic	ip, ip, #0xff000000
@@ -117,11 +113,13 @@ ARM_BE8(rev16	ip, ip)
 	orreq	ip, ip, r0		@ mask in offset bits 7-0
 #endif
 	str	ip, [r7, r3]
-2:	cmp	r4, r5
+#endif
+
+.Lnext:
+	cmp	r4, r5
 	ldrcc	r7, [r4], #4		@ use branch for delay slot
-	bcc	1b
+	bcc	.Lloop
 	ret	lr
-#endif
 ENDPROC(__fixup_a_pv_table)
 
 	.align