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s390/spinlock: Use flag output constraint for arch_cmpxchg_niai8()
Add a new variant of arch_cmpxchg_niai8() which makes use of the flag
output constraint, which allows the compiler to generate slightly better
code. Also rename arch_cmpxchg_niai8() to arch_try_cmpxchg_niai8() which
reflects the purpose of the function and makes it consistent with other
"try" variants.
Signed-off-by: Heiko Carstens <[email protected]>
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