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s390/processor: add test_and_set_cpu_flag() and test_and_clear_cpu_flag()

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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>
This commit is contained in:
Heiko Carstens 2023-02-13 12:35:18 +01:00
parent b977f03ec4
commit f96f41aae2
1 changed files with 16 additions and 0 deletions
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16
arch/s390/include/asm/processor.h
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@ -59,6 +59,22 @@ static __always_inline bool test_cpu_flag(int flag)
return S390_lowcore.cpu_flags & (1UL << flag);
}
static __always_inline bool test_and_set_cpu_flag(int flag)
{
if (test_cpu_flag(flag))
return true;
set_cpu_flag(flag);
return false;
}
static __always_inline bool test_and_clear_cpu_flag(int flag)
{
if (!test_cpu_flag(flag))
return false;
clear_cpu_flag(flag);
return true;
}
/*
* Test CIF flag of another CPU. The caller needs to ensure that
* CPU hotplug can not happen, e.g. by disabling preemption.