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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: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Catalin Marinas 2013-04-30 15:58:37 +01:00
parent c47d6a04e6
commit 16c85a1fd7
1 changed files with 2 additions and 4 deletions
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6
arch/arm64/lib/bitops.S
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@ -46,13 +46,11 @@ ENTRY( \name )
mov x2, #1 mov x2, #1
add x1, x1, x0, lsr #3 // Get word offset add x1, x1, x0, lsr #3 // Get word offset
lsl x4, x2, x3 // Create mask lsl x4, x2, x3 // Create mask
smp_dmb ish 1: ldaxr x2, [x1]
1: ldxr x2, [x1]
lsr x0, x2, x3 // Save old value of bit lsr x0, x2, x3 // Save old value of bit
\instr x2, x2, x4 // toggle bit \instr x2, x2, x4 // toggle bit
stxr w5, x2, [x1] stlxr w5, x2, [x1]
cbnz w5, 1b cbnz w5, 1b
smp_dmb ish
and x0, x0, #1 and x0, x0, #1
3: ret 3: ret
ENDPROC(\name ) ENDPROC(\name )