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s390/processor: add test_and_set_cpu_flag() and test_and_clear_cpu_flag()
Add test_and_set_cpu_flag() and test_and_clear_cpu_flag() helper functions. Reviewed-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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@ -59,6 +59,22 @@ static __always_inline bool test_cpu_flag(int flag)
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return S390_lowcore.cpu_flags & (1UL << flag);
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}
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static __always_inline bool test_and_set_cpu_flag(int flag)
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{
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if (test_cpu_flag(flag))
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return true;
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set_cpu_flag(flag);
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return false;
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}
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static __always_inline bool test_and_clear_cpu_flag(int flag)
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{
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if (!test_cpu_flag(flag))
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return false;
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clear_cpu_flag(flag);
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return true;
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}
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/*
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* Test CIF flag of another CPU. The caller needs to ensure that
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* CPU hotplug can not happen, e.g. by disabling preemption.
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