__TEST_AND_CLEAR_BIT - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Basic C Library Functions

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NAME__test_and_clear_bit − Clear a bit and return its old value

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SYNOPSISint __test_and_clear_bit(int nr, volatile unsigned long * addr);

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ARGUMENTSnr Bit to clear addr Address to count from

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DESCRIPTIONThis operation is non−atomic and can be reordered​. If two examples of this operation race, one can appear to succeed but actually fail​. You must protect multiple accesses with a lock​.

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NOTEthe operation is performed atomically with respect to the local CPU, but not other CPUs​. Portable code should not rely on this behaviour​. KVM relies on this behaviour on x86 for modifying memory that is also

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ACCESSED FROM A HYPERVISOR ON THE SAME CPU IF RUNNING IN A VMdon´t change this without also updating arch/x86/kernel/kvm​.c

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