KFunc `bpf_wakeup_sources_read_unlock`

Release the sleepable RCU lock for wake-up sources.

Definition

The BPF verifier guarantees that lock is a valid, unreleased pointer from the acquire function. We decode the pointer back into the integer sleepable RCU index by subtracting 1 and release the lock.

Parameters

lock: The opaque pointer returned by bpf_wakeup_sources_read_lock

Signature

void bpf_wakeup_sources_read_unlock(struct bpf_ws_lock *lock)

Note

This kfunc releases the pointer passed in to it. There can be only one referenced pointer that can be passed in. All copies of the pointer being released are invalidated as a result of invoking this kfunc.

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:

BPF_PROG_TYPE_SYSCALL

Example