bpf_obj_drop(9)

🌸 NAME — bpf_obj_drop(9) from the Kernel API Manual 🌸

okay so this page is literally about bpf_obj_drop: drop a previously allocated object. That’s the whole name, bestie, and it’s giving cleanup main character energy 💅✨.

✨ SYNOPSIS ✨

Here is the exact signature, no cap:

__bpf_kfunc void bpf_obj_drop (void *p__alloc , struct btf_struct_meta
*meta );

🎀 ARGUMENTS 🎀

• p__alloc — object to free. Bye bestie 🫶.
• meta — verifier-supplied struct metadata. Do not set this yourself; the verifier handles it.

💖 DESCRIPTION 💖

okay so bpf_obj_drop() destroys special fields in p__alloc as needed and frees the object. That’s the vibe: special fields get handled as needed, then the object is freed. ✨

And about meta? The verifier rewrites meta; BPF programs do not set it. So do not come for that field, bestie 😭 — it is verifier business, not yours. 💜

🦋 SEE ALSO 🦋

Kernel file: ./kernel/bpf/helpers.c — that’s the spot. And the whole friend group:

• bpf_obj_new(9)
• bpf_percpu_obj_new(9)
• bpf_percpu_obj_drop(9)
• bpf_refcount_acquire(9)
• bpf_list_push_front(9)
• bpf_list_push_back(9)
• bpf_rbtree_add(9)
• bpf_task_acquire(9)
• bpf_task_release(9)
• bpf_cgroup_acquire(9)
• bpf_cgroup_release(9)
• bpf_cgroup_ancestor(9)
• bpf_cgroup_from_id(9)
• bpf_task_under_cgroup(9)
• bpf_task_get_cgroup1(9)
• bpf_task_from_pid(9)
• bpf_task_from_vpid(9)
• bpf_dynptr_slice(9)
• bpf_dynptr_slice_rdwr(9)
• bpf_dynptr_copy(9)
• bpf_dynptr_memset(9)
• bpf_iter_bits_new(9)
• bpf_iter_bits_next(9)
• bpf_iter_bits_destroy(9)
• bpf_copy_from_user_str(9)
• bpf_copy_from_user_task_str(9)
• bpf_strcmp(9)
• bpf_strcasecmp(9)
• bpf_strnchr(9)
• bpf_strchr(9)
• bpf_strchrnul(9)
• bpf_strrchr(9)
• bpf_strnlen(9)
• bpf_strlen(9)
• bpf_strspn(9)
• bpf_strcspn(9)
• bpf_strstr(9)
• bpf_strcasestr(9)
• bpf_strnstr(9)
• bpf_strncasestr(9)
• bpf_lookup_user_key(9)
• bpf_lookup_system_key(9)
• bpf_key_put(9)
• bpf_verify_pkcs7_signature(9)
• bpf_task_work_schedule_signal(9)
• bpf_task_work_schedule_resume(9)
• bpf_timer_cancel_async(9)

okay bye bestie 💖 source/version: ./kernel/bpf · date: October 2026 · page: bpf_obj_drop(9) ✨