ARM: p2v: simplify __fixup_pv_table()

mainline inclusion
from mainline-5.11-rc1
commit 0e3db6c9
category: bugfix
bugzilla: 46882
CVE: NA

-------------------------------------------------
Declutter the code in __fixup_pv_table() by using the new adr_l/str_l
macros to take PC relative references to external symbols, and by
using the value of PHYS_OFFSET passed in r8 to calculate the p2v
offset.
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 0e3db6c9)
Signed-off-by: NZhao Hongjiang <zhaohongjiang@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>

arch/arm/kernel/phys2virt.S

@@ -29,33 +29,27 @@
  */
 	__HEAD
 ENTRY(__fixup_pv_table)
-	adr	r0, 1f
-	ldmia	r0, {r3-r7}
-	mvn	ip, #0
-	subs	r3, r0, r3		@ PHYS_OFFSET - PAGE_OFFSET
-	add	r4, r4, r3		@ adjust table start address
-	add	r5, r5, r3		@ adjust table end address
-	add	r6, r6, r3		@ adjust __pv_phys_pfn_offset address
-	add	r7, r7, r3		@ adjust __pv_offset address
 	mov	r0, r8, lsr #PAGE_SHIFT	@ convert to PFN
-	str	r0, [r6]		@ save computed PHYS_OFFSET to __pv_phys_pfn_offset
-	strcc	ip, [r7, #HIGH_OFFSET]	@ save to __pv_offset high bits
-	mov	r6, r3, lsr #24		@ constant for add/sub instructions
-	teq	r3, r6, lsl #24 	@ must be 16MiB aligned
+	str_l	r0, __pv_phys_pfn_offset, r3
+
+	adr_l	r0, __pv_offset
+	subs	r3, r8, #PAGE_OFFSET	@ PHYS_OFFSET - PAGE_OFFSET
+	mvn	ip, #0
+	strcc	ip, [r0, #HIGH_OFFSET]	@ save to __pv_offset high bits
+	str	r3, [r0, #LOW_OFFSET]	@ save to __pv_offset low bits
+
+	mov	r0, r3, lsr #24		@ constant for add/sub instructions
+	teq	r3, r0, lsl #24 	@ must be 16MiB aligned
 	bne	0f
-	str	r3, [r7, #LOW_OFFSET]	@ save to __pv_offset low bits
+
+	adr_l	r4, __pv_table_begin
+	adr_l	r5, __pv_table_end
 	b	__fixup_a_pv_table
+
 0:	mov	r0, r0			@ deadloop on error
 	b	0b
 ENDPROC(__fixup_pv_table)
 
-	.align
-1:	.long	.
-	.long	__pv_table_begin
-	.long	__pv_table_end
-2:	.long	__pv_phys_pfn_offset
-	.long	__pv_offset
-
 	.text
 __fixup_a_pv_table:
 	adr_l	r6, __pv_offset