Commit 16c85a1f authored by Catalin Marinas's avatar Catalin Marinas
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arm64: Use acquire/release semantics instead of explicit DMB 



This patch changes the test_and_*_bit functions to use the
load-acquire/store-release instructions instead of explicit DMB.

Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent c47d6a04

arch/arm64/lib/bitops.S

+2 −4
Original line number Diff line number Diff line
@@ -46,13 +46,11 @@ ENTRY( \name ) 
	mov	x2, #1

	add	x1, x1, x0, lsr #3	// Get word offset

	lsl	x4, x2, x3		// Create mask

	smp_dmb	ish

1:	ldxr	x2, [x1]

1:	ldaxr	x2, [x1]

	lsr	x0, x2, x3		// Save old value of bit

	\instr	x2, x2, x4		// toggle bit

	stxr	w5, x2, [x1]

	stlxr	w5, x2, [x1]

	cbnz	w5, 1b

	smp_dmb	ish

	and	x0, x0, #1

3:	ret

ENDPROC(\name	)