[PATCH] ARM: Convert bitops to use ARMv6 ldrex/strex instructions

#if __LINUX_ARM_ARCH__ >= 6

	.macro	bitop, instr

	mov	r2, #1

	and	r3, r0, #7		@ Get bit offset

	add	r1, r1, r0, lsr #3	@ Get byte offset

	mov	r3, r2, lsl r3

1:	ldrexb	r2, [r1]

	\instr	r2, r2, r3

	strexb	r0, r2, [r1]

	cmpne	r0, #0

	bne	1b

	mov	pc, lr

	.endm

	.macro	testop, instr, store

	and	r3, r0, #7		@ Get bit offset

	mov	r2, #1

	add	r1, r1, r0, lsr #3	@ Get byte offset

	mov	r3, r2, lsl r3		@ create mask

1:	ldrexb	r2, [r1]

	ands	r0, r2, r3		@ save old value of bit

	\instr	ip, r2, r3			@ toggle bit

	strexb	r2, ip, [r1]

	cmp	r2, #0

	bne	1b

	cmp	r0, #0

	movne	r0, #1

2:	mov	pc, lr

	.endm

#else

	.macro	bitop, instr

	and	r2, r0, #7

	mov	r3, #1

	moveq	r0, #0

	mov	pc, lr

	.endm

#endif