Module fails to load: "__UNIQUE_ID" macro initialization error when using RCU

[dream2333]

When trying to use RCU protection to safely access current->cred->uid, the ide show err

Code Context

The module compiles successfully but fails to load into the kernel when using RCU protection to safely access current->cred->uid. The error appears to be related to __UNIQUE_ID marco initialization issues at runtime.

uid_t safe_current_uid()
{
    const struct cred *cred;
    uid_t uid;
    rcu_read_lock();
    cred = rcu_dereference(*(struct cred **)((uintptr_t)current + task_struct_offset.cred_offset));
    if (cred) {
        uid = *(uid_t *)((uintptr_t)cred + cred_offset.uid_offset);
    } else {
        uid = current_uid(); // fallback
    }
    rcu_read_unlock();
    
    return uid;
}

Kernel Logs

[Thu Jul 10 21:57:57 2025] KernelSU: prctl reply error, cmd: 30
[Thu Jul 10 21:57:57 2025] KernelSU: KPM: calling before arg2=34
[Thu Jul 10 21:57:57 2025] KernelSU: KPM: calling before arg2=31
[Thu Jul 10 21:57:57 2025] KernelSU: prctl reply error, cmd: 30
[Thu Jul 10 21:57:57 2025] KernelSU: KPM: calling before arg2=34
[Thu Jul 10 21:57:57 2025] KernelSU: KPM: calling before arg2=34
[Thu Jul 10 21:57:57 2025] KernelSU: prctl reply error, cmd: 30
[Thu Jul 10 21:57:57 2025] KernelSU: do_execveat_common su found

[dream2333]

Alternatively, is there a thread-safe method to retrieve the UID in concurrent scenarios? I would be very grateful for any advice