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[ARM SMP] Fix data corruption in test_* bitops

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If we found that the bit was already in the desired state, we
would skip performing the operation, and write random data back.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2005-07-27 23:00:05 +01:00 committed by Russell King
parent 9e566d8bd6
commit 614d73edae
1 changed files with 3 additions and 3 deletions
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6
arch/arm/lib/bitops.h
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@ -19,9 +19,9 @@
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
\instr r2, r2, r3 @ toggle bit
strexb ip, r2, [r1]
cmp ip, #0
bne 1b
cmp r0, #0
movne r0, #1