From 16c85a1fd73eade2ae290d759924c09b4595f504 Mon Sep 17 00:00:00 2001 From: Catalin Marinas Date: Tue, 30 Apr 2013 15:58:37 +0100 Subject: [PATCH] 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: Catalin Marinas --- arch/arm64/lib/bitops.S | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/arch/arm64/lib/bitops.S b/arch/arm64/lib/bitops.S index eaed8bbd78fc..36216d30cb9a 100644 --- a/arch/arm64/lib/bitops.S +++ b/arch/arm64/lib/bitops.S @@ -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 ) -- 2.20.1