Commit f96f41aa authored by Heiko Carstens's avatar Heiko Carstens
Browse files

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: default avatarSven Schnelle <svens@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent b977f03e

arch/s390/include/asm/processor.h

+16 −0
Original line number Original line Diff line number Diff line
@@ -59,6 +59,22 @@ static __always_inline bool test_cpu_flag(int flag) 
	return S390_lowcore.cpu_flags & (1UL << 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

 * Test CIF flag of another CPU. The caller needs to ensure that

 * CPU hotplug can not happen, e.g. by disabling preemption.

 * CPU hotplug can not happen, e.g. by disabling preemption.