KFunc bpf_cpumask_create
Create a mutable BPF CPU-mask.
Definition
Allocates a CPU-mask that can be queried, mutated, acquired, and released by
a BPF program. The CPU-mask returned by this function must either be embedded
in a map as a kptr, or freed with bpf_cpumask_release().
bpf_cpumask_create() allocates memory using the BPF memory allocator, and
will not block. It may return NULL if no memory is available.
struct bpf_cpumask *bpf_cpumask_create()
Note
This kfunc returns a pointer to a refcounted object. The verifier will then ensure that the pointer to the object
is eventually released using a release kfunc, or transferred to a map using a referenced kptr
(by invoking bpf_kptr_xchg). If not, the verifier fails the
loading of the BPF program until no lingering references remain in all possible explored states of the program.
Note
The pointer returned by the kfunc may be NULL. Hence, it forces the user to do a NULL check on the pointer returned from the kfunc before making use of it (dereferencing or passing to another helper).
Usage
Docs could be improved
This part of the docs is incomplete, contributions are very welcome
Program types
The following program types can make use of this kfunc:
Example
Docs could be improved
This part of the docs is incomplete, contributions are very welcome