4 files changed, 14 insertions, 49 deletions

diff --git a/arch/arm/lib/backtrace.S b/arch/arm/lib/backtrace.S
index fab5a50503ae..7d7952e5a3b1 100644
--- a/arch/arm/lib/backtrace.S
+++ b/arch/arm/lib/backtrace.S
@@ -10,6 +10,7 @@
  * 27/03/03 Ian Molton Clean up CONFIG_CPU
  *
  */
+#include <linux/kern_levels.h>
 #include <linux/linkage.h>
 #include <asm/assembler.h>
 		.text
@@ -83,13 +84,13 @@ for_each_frame:	tst	frame, mask		@ Check for address exceptions
 		teq	r3, r1, lsr #11
 		ldreq	r0, [frame, #-8]	@ get sp
 		subeq	r0, r0, #4		@ point at the last arg
-		bleq	.Ldumpstm		@ dump saved registers
+		bleq	dump_backtrace_stm	@ dump saved registers
 
 1004:		ldr	r1, [sv_pc, #0]		@ if stmfd sp!, {..., fp, ip, lr, pc}
 		ldr	r3, .Ldsi		@ instruction exists,
 		teq	r3, r1, lsr #11
 		subeq	r0, frame, #16
-		bleq	.Ldumpstm		@ dump saved registers
+		bleq	dump_backtrace_stm	@ dump saved registers
 
 		teq	sv_fp, #0		@ zero saved fp means
 		beq	no_frame		@ no further frames
@@ -112,38 +113,6 @@ ENDPROC(c_backtrace)
 		.long	1004b, 1006b
 		.popsection
 
-#define instr r4
-#define reg   r5
-#define stack r6
-
-.Ldumpstm:	stmfd	sp!, {instr, reg, stack, r7, lr}
-		mov	stack, r0
-		mov	instr, r1
-		mov	reg, #10
-		mov	r7, #0
-1:		mov	r3, #1
- ARM(		tst	instr, r3, lsl reg	)
- THUMB(		lsl	r3, reg			)
- THUMB(		tst	instr, r3		)
-		beq	2f
-		add	r7, r7, #1
-		teq	r7, #6
-		moveq	r7, #0
-		adr	r3, .Lcr
-		addne	r3, r3, #1		@ skip newline
-		ldr	r2, [stack], #-4
-		mov	r1, reg
-		adr	r0, .Lfp
-		bl	printk
-2:		subs	reg, reg, #1
-		bpl	1b
-		teq	r7, #0
-		adrne	r0, .Lcr
-		blne	printk
-		ldmfd	sp!, {instr, reg, stack, r7, pc}
-
-.Lfp:		.asciz	" r%d:%08x%s"
-.Lcr:		.asciz	"\n"
 .Lbad:		.asciz	"Backtrace aborted due to bad frame pointer <%p>\n"
 		.align
 .Ldsi:		.word	0xe92dd800 >> 11	@ stmfd sp!, {... fp, ip, lr, pc}
diff --git a/arch/arm/lib/copy_from_user.S b/arch/arm/lib/copy_from_user.S
index 1512bebfbf1b..7a4b06049001 100644
--- a/arch/arm/lib/copy_from_user.S
+++ b/arch/arm/lib/copy_from_user.S
@@ -98,12 +98,9 @@ ENDPROC(arm_copy_from_user)
 	.pushsection .fixup,"ax"
 	.align 0
 	copy_abort_preamble
-	ldmfd	sp!, {r1, r2}
-	sub	r3, r0, r1
-	rsb	r1, r3, r2
-	str	r1, [sp]
-	bl	__memzero
-	ldr	r0, [sp], #4
+	ldmfd	sp!, {r1, r2, r3}
+	sub	r0, r0, r1
+	rsb	r0, r0, r2
 	copy_abort_end
 	.popsection
 
diff --git a/arch/arm/lib/delay-loop.S b/arch/arm/lib/delay-loop.S
index 792c59d885bc..c766694e929c 100644
--- a/arch/arm/lib/delay-loop.S
+++ b/arch/arm/lib/delay-loop.S
@@ -17,24 +17,23 @@
 .LC1:		.word	UDELAY_MULT
 
 /*
+ * loops = r0 * HZ * loops_per_jiffy / 1000000
+ *
  * r0  <= 2000
  * HZ  <= 1000
  */
 
 ENTRY(__loop_udelay)
 		ldr	r2, .LC1
-		mul	r0, r2, r0
-ENTRY(__loop_const_udelay)			@ 0 <= r0 <= 0x7fffff06
+		mul	r0, r2, r0		@ r0 = delay_us * UDELAY_MULT
+ENTRY(__loop_const_udelay)			@ 0 <= r0 <= 0xfffffaf0
 		ldr	r2, .LC0
 		ldr	r2, [r2]
-		umull	r1, r0, r2, r0
-		adds	r1, r1, #0xffffffff
-		adcs	r0, r0, r0
+		umull	r1, r0, r2, r0		@ r0-r1 = r0 * loops_per_jiffy
+		adds	r1, r1, #0xffffffff	@ rounding up ...
+		adcs	r0, r0, r0		@ and right shift by 31
 		reteq	lr
 
-/*
- * loops = r0 * HZ * loops_per_jiffy / 1000000
- */
 		.align 3
 
 @ Delay routine
diff --git a/arch/arm/lib/delay.c b/arch/arm/lib/delay.c
index 8044591dca72..2cef11884857 100644
--- a/arch/arm/lib/delay.c
+++ b/arch/arm/lib/delay.c
@@ -29,7 +29,7 @@
 /*
  * Default to the loop-based delay implementation.
  */
-struct arm_delay_ops arm_delay_ops = {
+struct arm_delay_ops arm_delay_ops __ro_after_init = {
 	.delay		= __loop_delay,
 	.const_udelay	= __loop_const_udelay,
 	.udelay		= __loop_udelay,